Unified Coverage Report :: Module :: prim_reg_cdc

Module : prim_reg_cdc

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.30	100.00	89.20			100.00	100.00

Source File(s) :
/workspaces/repo/scratch/os_regression_2024_10_14/sysrst_ctrl-sim-vcs/default/sim-vcs/../src/lowrisc_prim_subreg_0/rtl/prim_reg_cdc.sv

Module self-instances :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
tb.dut.u_reg.u_wkup_status_cdc	96.88	100.00	87.50			100.00	100.00
tb.dut.u_reg.u_ec_rst_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_key_invert_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_pin_allowed_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_pin_out_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_pin_out_value_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_key_intr_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_key_intr_debounce_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_auto_block_debounce_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_auto_block_out_ctl_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_pre_det_ctl_0_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_pre_det_ctl_1_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_pre_det_ctl_2_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_pre_det_ctl_3_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_sel_ctl_0_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_sel_ctl_1_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_sel_ctl_2_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_sel_ctl_3_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_det_ctl_0_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_det_ctl_1_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_det_ctl_2_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_det_ctl_3_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_out_ctl_0_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_out_ctl_1_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_out_ctl_2_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_com_out_ctl_3_cdc	97.73	100.00	90.91			100.00	100.00
tb.dut.u_reg.u_ulp_ctl_cdc	98.08	100.00	92.31			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_wkup_status_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
96.88	100.00	87.50			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
94.70	96.99	88.57			93.22	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	93.39	95.92	86.96			90.70	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_ec_rst_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
98.33	100.00	93.33			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	97.73	100.00	90.91			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
98.33	100.00	93.33			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	97.73	100.00	90.91			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
98.33	100.00	93.33			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	97.73	100.00	90.91			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
98.33	100.00	93.33			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	97.73	100.00	90.91			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_key_invert_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_pin_allowed_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_pin_out_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_pin_out_value_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_key_intr_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_key_intr_debounce_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
98.33	100.00	93.33			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	97.73	100.00	90.91			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_auto_block_debounce_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
98.33	100.00	93.33			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	97.73	100.00	90.91			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_auto_block_out_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_pre_det_ctl_0_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_pre_det_ctl_1_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_pre_det_ctl_2_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_pre_det_ctl_3_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_sel_ctl_0_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_sel_ctl_1_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
97.73	100.00	90.91			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.17	100.00	96.67			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_ulp_ctl_cdc

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
98.08	100.00	92.31			100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
99.22	100.00	96.88			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
100.00	100.00	100.00			100.00	100.00	u_reg

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
u_arb	100.00	100.00	100.00			100.00	100.00
u_src_to_dst_req	100.00	100.00	100.00			100.00	100.00

Line Coverage for Module : prim_reg_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T5 T2 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T5 T2 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T5 T2 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T5 T2 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T5 T2 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T2 T15 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T2 T15 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Module : prim_reg_cdc ( parameter DataWidth=16,ResetVal,BitMask=65535,DstWrReq=0,TxnWidth=3 + DataWidth=12,ResetVal=0,BitMask=4095,DstWrReq=0,TxnWidth=3 + DataWidth=8,ResetVal,BitMask=255,DstWrReq=0,TxnWidth=3 + DataWidth=14,ResetVal=0,BitMask=16383,DstWrReq=0,TxnWidth=3 + DataWidth=17,ResetVal=2000,BitMask=131071,DstWrReq=0,TxnWidth=3 + DataWidth=7,ResetVal=0,BitMask=119,DstWrReq=0,TxnWidth=3 + DataWidth=5,ResetVal=0,BitMask=31,DstWrReq=0,TxnWidth=3 + DataWidth=32,ResetVal=0,BitMask=-1,DstWrReq=0,TxnWidth=3 + DataWidth=4,ResetVal=0,BitMask=15,DstWrReq=0,TxnWidth=3 )
Cond Coverage for Module self-instances :

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_ec_rst_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_pin_allowed_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_key_intr_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_key_invert_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_pin_out_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_pin_out_value_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_key_intr_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_auto_block_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_auto_block_out_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_sel_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_sel_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_sel_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_sel_ctl_3_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_det_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_det_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_det_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_det_ctl_3_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_det_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_det_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_det_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_det_ctl_3_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_out_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_out_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_out_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_out_ctl_3_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T5,T2

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T5,T2
1	1	Covered	T1,T5,T2

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T5,T2

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T5,T2
1	1	Covered	T1,T5,T2

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Cond Coverage for Module : prim_reg_cdc ( parameter DataWidth=1,ResetVal=0,BitMask=1,DstWrReq=0,TxnWidth=3 + DataWidth=1,ResetVal=0,BitMask=1,DstWrReq=1,TxnWidth=3 )
Cond Coverage for Module self-instances :

SCORE	COND
98.08	92.31

tb.dut.u_reg.u_ulp_ctl_cdc

SCORE	COND
96.88	87.50

tb.dut.u_reg.u_wkup_status_cdc

	Total	Covered	Percent
Conditions	16	14	87.50
Logical	16	14	87.50
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T20

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T6,T12,T20
1	1	Covered	T6,T12,T20

 LINE       123
 EXPRESSION (src_wd_i & BitMask)
             ----1---   ---2---

-1-	-2-	Status	Tests
0	-	Covered	T6,T12,T19
1	-	Covered	T6,T12,T20

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Covered	T1,T2,T3
1	0	Covered	T6,T12,T20

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T6,T12,T20
1	1	Covered	T6,T12,T20

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Not Covered
1	1	Covered	T1,T2,T3

---

Branch Coverage for Module : prim_reg_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T5,T2
0	0	1	Covered	T1,T5,T2
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T5,T2
0	0	1	Covered	T1,T2,T15
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Module : prim_reg_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	2147483647	99529387	0	0
DstReqKnown_A	259251394	236514064	0	0
SrcAckBusyChk_A	2147483647	104476	0	0
SrcBusyKnown_A	2147483647	2147483647	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	99529387	0	0
T1	68287	356	0	0
T2	215378	1776	0	0
T3	454652	0	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T6	456104	0	0	0
T8	487588	1868	0	0
T9	485178	1965	0	0
T10	0	1353	0	0
T12	651560	5269	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	1011747	10983	0	0
T17	479727	0	0	0
T18	171603	0	0	0
T20	0	1480	0	0
T26	492074	0	0	0
T27	0	12542	0	0
T28	0	13751	0	0
T29	0	1909	0	0
T30	0	344	0	0
T31	0	1217	0	0
T56	0	676	0	0
T57	0	1495	0	0
T58	0	13322	0	0
T59	0	11554	0	0
T60	0	2580	0	0
T61	0	11272	0	0
T62	0	10811	0	0
T63	0	10591	0	0
T64	385932	0	0	0
T65	342316	0	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	259251394	236514064	0	0
T1	17170	3570	0	0
T2	16422	2822	0	0
T4	15198	1598	0	0
T5	16864	3264	0	0
T13	14348	748	0	0
T14	17782	4182	0	0
T15	24072	10472	0	0
T16	22916	9316	0	0
T17	51748	1598	0	0
T18	16898	3298	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	104476	0	0
T1	68287	1	0	0
T2	215378	1	0	0
T3	454652	0	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T6	456104	0	0	0
T8	487588	1	0	0
T9	485178	1	0	0
T10	0	1	0	0
T12	651560	21	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	1011747	7	0	0
T17	479727	0	0	0
T18	171603	0	0	0
T20	0	4	0	0
T26	492074	0	0	0
T27	0	7	0	0
T28	0	8	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T56	0	1	0	0
T57	0	1	0	0
T58	0	8	0	0
T59	0	7	0	0
T60	0	7	0	0
T61	0	7	0	0
T62	0	7	0	0
T63	0	6	0	0
T64	385932	0	0	0
T65	342316	0	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	2147483647	0	0
T1	2321758	2319718	0	0
T2	7322852	7320982	0	0
T4	1901620	1899682	0	0
T5	8020770	8017812	0	0
T13	6887924	6885612	0	0
T14	4356488	4353598	0	0
T15	5902264	5899000	0	0
T16	11466466	11463746	0	0
T17	5436906	5405660	0	0
T18	1944834	1943100	0	0

Line Coverage for Instance : tb.dut.u_reg.u_wkup_status_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T6 T12 T20 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T6 T12 T20 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T6 T12 T20 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T6 T12 T20 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T6 T12 T20 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T2 T3 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T2 T3 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_wkup_status_cdc

	Total	Covered	Percent
Conditions	16	14	87.50
Logical	16	14	87.50
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T20

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T6,T12,T20
1	1	Covered	T6,T12,T20

 LINE       123
 EXPRESSION (src_wd_i & BitMask)
             ----1---   ---2---

-1-	-2-	Status	Tests
0	-	Covered	T12,T35,T36
1	-	Covered	T6,T20,T19

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Covered	T1,T2,T3
1	0	Covered	T6,T12,T20

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T6,T12,T20
1	1	Covered	T6,T12,T20

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Not Covered
1	1	Covered	T1,T2,T3

---

Branch Coverage for Instance : tb.dut.u_reg.u_wkup_status_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T20
0	0	1	Covered	T6,T12,T20
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T20
0	0	1	Covered	T1,T2,T3
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_wkup_status_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	972065	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1074	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	972065	0	0
T6	228052	1463	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	246	0	0
T19	0	3451	0	0
T20	0	376	0	0
T25	22809	0	0	0
T38	0	734	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	755	0	0
T70	0	705	0	0
T71	0	791	0	0
T72	0	1934	0	0
T73	0	298	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1074	0	0
T6	228052	1	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	1	0	0
T19	0	2	0	0
T20	0	1	0	0
T25	22809	0	0	0
T38	0	2	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	2	0	0
T70	0	1	0	0
T71	0	2	0	0
T72	0	1	0	0
T73	0	2	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_ec_rst_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T2 T15 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T2 T15 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T2 T15 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T2 T15 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T2 T15 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T2 T15 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T2 T15 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_ec_rst_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T15

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T2,T15
1	1	Covered	T1,T2,T15

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T15

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T2,T15
1	1	Covered	T1,T2,T15

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_ec_rst_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T15
0	0	1	Covered	T1,T2,T15
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T15
0	0	1	Covered	T1,T2,T15
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_ec_rst_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1641147	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1804	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1641147	0	0
T1	68287	340	0	0
T2	215378	1772	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1851	0	0
T9	0	1945	0	0
T10	0	1349	0	0
T12	0	270	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	732	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T29	0	1905	0	0
T56	0	664	0	0
T78	0	1986	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1804	0	0
T1	68287	1	0	0
T2	215378	1	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	1	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	1	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T29	0	1	0	0
T56	0	1	0	0
T78	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T6 T12 T19 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T6 T12 T19 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T6 T12 T19 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T6 T12 T19 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T6 T12 T19 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T6 T12 T19 
135        1/1                txn_bits_q <= '0;
           Tests:       T6 T12 T19 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T19

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T6,T12,T19
1	1	Covered	T6,T12,T19

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T19

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T6,T12,T19
1	1	Covered	T6,T12,T19

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T19
0	0	1	Covered	T6,T12,T19
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T19
0	0	1	Covered	T6,T12,T19
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	840202	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	934	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	840202	0	0
T6	228052	3425	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	263	0	0
T19	0	3461	0	0
T25	22809	0	0	0
T38	0	1243	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	1096	0	0
T70	0	719	0	0
T71	0	1344	0	0
T72	0	1949	0	0
T73	0	317	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0
T79	0	345	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	934	0	0
T6	228052	2	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	1	0	0
T19	0	2	0	0
T25	22809	0	0	0
T38	0	3	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	3	0	0
T70	0	1	0	0
T71	0	3	0	0
T72	0	1	0	0
T73	0	2	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0
T79	0	3	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T6 T12 T19 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T6 T12 T19 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T6 T12 T19 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T6 T12 T19 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T6 T12 T19 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T6 T12 T19 
135        1/1                txn_bits_q <= '0;
           Tests:       T6 T12 T19 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T19

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T6,T12,T19
1	1	Covered	T6,T12,T19

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T19

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T6,T12,T19
1	1	Covered	T6,T12,T19

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T19
0	0	1	Covered	T6,T12,T19
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T19
0	0	1	Covered	T6,T12,T19
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	881220	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	988	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	881220	0	0
T6	228052	3421	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	256	0	0
T19	0	3457	0	0
T25	22809	0	0	0
T38	0	1237	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	1090	0	0
T70	0	713	0	0
T71	0	1332	0	0
T72	0	1945	0	0
T73	0	298	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0
T79	0	339	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	988	0	0
T6	228052	2	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	1	0	0
T19	0	2	0	0
T25	22809	0	0	0
T38	0	3	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	3	0	0
T70	0	1	0	0
T71	0	3	0	0
T72	0	1	0	0
T73	0	2	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0
T79	0	3	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T6 T12 T19 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T6 T12 T19 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T6 T12 T19 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T6 T12 T19 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T6 T12 T19 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T6 T12 T19 
135        1/1                txn_bits_q <= '0;
           Tests:       T6 T12 T19 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T19

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T6,T12,T19
1	1	Covered	T6,T12,T19

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T19

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T6,T12,T19
1	1	Covered	T6,T12,T19

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T19
0	0	1	Covered	T6,T12,T19
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T19
0	0	1	Covered	T6,T12,T19
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	876040	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	978	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	876040	0	0
T6	228052	3417	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	254	0	0
T19	0	3453	0	0
T25	22809	0	0	0
T38	0	1231	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	1084	0	0
T70	0	705	0	0
T71	0	1313	0	0
T72	0	1935	0	0
T73	0	267	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0
T79	0	333	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	978	0	0
T6	228052	2	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	1	0	0
T19	0	2	0	0
T25	22809	0	0	0
T38	0	3	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	3	0	0
T70	0	1	0	0
T71	0	3	0	0
T72	0	1	0	0
T73	0	2	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0
T79	0	3	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_key_invert_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T5 T18 T25 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T5 T18 T25 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T5 T18 T25 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T5 T18 T25 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T5 T18 T25 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T5 T18 T25 
135        1/1                txn_bits_q <= '0;
           Tests:       T5 T18 T25 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_key_invert_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T5,T18,T25

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T5,T18,T25
1	1	Covered	T5,T18,T25

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T5,T18,T25

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T5,T18,T25
1	1	Covered	T5,T18,T25

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_key_invert_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T5,T18,T25
0	0	1	Covered	T5,T18,T25
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T5,T18,T25
0	0	1	Covered	T5,T18,T25
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_key_invert_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1927894	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	2086	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1927894	0	0
T2	215378	0	0	0
T3	227326	0	0	0
T5	235905	35053	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	7827	0	0
T25	0	3152	0	0
T26	246037	0	0	0
T68	0	3607	0	0
T80	0	32767	0	0
T81	0	17753	0	0
T82	0	8638	0	0
T83	0	35508	0	0
T84	0	5215	0	0
T85	0	8281	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	2086	0	0
T2	215378	0	0	0
T3	227326	0	0	0
T5	235905	20	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	20	0	0
T25	0	20	0	0
T26	246037	0	0	0
T68	0	20	0	0
T80	0	20	0	0
T81	0	20	0	0
T82	0	20	0	0
T83	0	20	0	0
T84	0	20	0	0
T85	0	20	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_pin_allowed_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T5 T14 T17 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T5 T14 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T5 T14 T17 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T5 T14 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T5 T14 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T5 T14 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T5 T14 T17 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_pin_allowed_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T5,T14,T17

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T5,T14,T17
1	1	Covered	T5,T14,T17

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T5,T14,T17

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T5,T14,T17
1	1	Covered	T5,T14,T17

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_pin_allowed_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T5,T14,T17
0	0	1	Covered	T5,T14,T17
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T5,T14,T17
0	0	1	Covered	T5,T14,T17
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_pin_allowed_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	3587704	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	3890	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	3587704	0	0
T2	215378	0	0	0
T3	227326	0	0	0
T5	235905	1886	0	0
T13	202586	0	0	0
T14	128132	16833	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	1869	0	0
T18	57201	327	0	0
T25	0	175	0	0
T26	246037	34921	0	0
T74	0	37431	0	0
T75	0	17680	0	0
T86	0	7681	0	0
T87	0	25902	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	3890	0	0
T2	215378	0	0	0
T3	227326	0	0	0
T5	235905	1	0	0
T13	202586	0	0	0
T14	128132	20	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	5	0	0
T18	57201	1	0	0
T25	0	1	0	0
T26	246037	20	0	0
T74	0	20	0	0
T75	0	20	0	0
T86	0	20	0	0
T87	0	60	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_pin_out_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T5 T2 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T5 T2 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T5 T2 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T5 T2 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T5 T2 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T5 T2 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T5 T2 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_pin_out_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T5,T2

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T5,T2
1	1	Covered	T1,T5,T2

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T5,T2

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T5,T2
1	1	Covered	T1,T5,T2

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_pin_out_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T5,T2
0	0	1	Covered	T1,T5,T2
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T5,T2
0	0	1	Covered	T1,T5,T2
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_pin_out_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	4527068	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	4844	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	4527068	0	0
T1	68287	378	0	0
T2	215378	1780	0	0
T4	55930	0	0	0
T5	235905	1894	0	0
T8	0	1890	0	0
T9	0	1988	0	0
T13	202586	0	0	0
T14	128132	16913	0	0
T15	173596	734	0	0
T16	337249	0	0	0
T17	159909	1977	0	0
T18	57201	334	0	0
T26	0	35179	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	4844	0	0
T1	68287	1	0	0
T2	215378	1	0	0
T4	55930	0	0	0
T5	235905	1	0	0
T8	0	1	0	0
T9	0	1	0	0
T13	202586	0	0	0
T14	128132	20	0	0
T15	173596	1	0	0
T16	337249	0	0	0
T17	159909	5	0	0
T18	57201	1	0	0
T26	0	20	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_pin_out_value_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T14 T17 T26 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T14 T17 T26 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T14 T17 T26 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T14 T17 T26 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T14 T17 T26 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T14 T17 T26 
135        1/1                txn_bits_q <= '0;
           Tests:       T14 T17 T26 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_pin_out_value_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T14,T17,T26

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T14,T17,T26
1	1	Covered	T14,T17,T26

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T14,T17,T26

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T14,T17,T26
1	1	Covered	T14,T17,T26

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_pin_out_value_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T14,T17,T26
0	0	1	Covered	T14,T17,T26
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T14,T17,T26
0	0	1	Covered	T14,T17,T26
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_pin_out_value_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	3553638	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	3808	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	3553638	0	0
T3	227326	0	0	0
T6	228052	0	0	0
T8	243794	0	0	0
T14	128132	16873	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	1930	0	0
T18	57201	0	0	0
T26	246037	35041	0	0
T64	192966	0	0	0
T74	0	37471	0	0
T75	0	17720	0	0
T86	0	7799	0	0
T87	0	26022	0	0
T88	0	16874	0	0
T89	0	8420	0	0
T90	0	8338	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	3808	0	0
T3	227326	0	0	0
T6	228052	0	0	0
T8	243794	0	0	0
T14	128132	20	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	5	0	0
T18	57201	0	0	0
T26	246037	20	0	0
T64	192966	0	0	0
T74	0	20	0	0
T75	0	20	0	0
T86	0	20	0	0
T87	0	60	0	0
T88	0	20	0	0
T89	0	20	0	0
T90	0	20	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_key_intr_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T3 T7 T11 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T3 T7 T11 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T3 T7 T11 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T3 T7 T11 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T3 T7 T11 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T3 T7 T11 
135        1/1                txn_bits_q <= '0;
           Tests:       T3 T7 T11 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_key_intr_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T3,T7,T11

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T3,T7,T11
1	1	Covered	T3,T7,T11

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T3,T7,T11

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T3,T7,T11
1	1	Covered	T3,T7,T11

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_key_intr_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T3,T7,T11
0	0	1	Covered	T3,T7,T11
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T3,T7,T11
0	0	1	Covered	T3,T7,T11
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_key_intr_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	860608	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	941	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	860608	0	0
T3	227326	1917	0	0
T6	228052	0	0	0
T7	0	960	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T11	0	215	0	0
T12	0	8240	0	0
T26	246037	0	0	0
T45	0	477	0	0
T46	0	1426	0	0
T48	0	366	0	0
T49	0	374	0	0
T52	0	479	0	0
T53	0	1406	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	941	0	0
T3	227326	1	0	0
T6	228052	0	0	0
T7	0	1	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T11	0	1	0	0
T12	0	28	0	0
T26	246037	0	0	0
T45	0	1	0	0
T46	0	1	0	0
T48	0	1	0	0
T49	0	1	0	0
T52	0	1	0	0
T53	0	1	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_key_intr_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T2 T3 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T2 T3 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T2 T3 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T2 T3 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T2 T3 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T2 T3 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T2 T3 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_key_intr_debounce_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T3

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T2,T3

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T3

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T2,T3

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_key_intr_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T3
0	0	1	Covered	T1,T2,T3
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T3
0	0	1	Covered	T1,T2,T3
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_key_intr_debounce_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1613761	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1813	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1613761	0	0
T1	68287	334	0	0
T2	215378	1770	0	0
T3	0	1915	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T7	0	948	0	0
T8	0	1842	0	0
T9	0	1933	0	0
T10	0	1347	0	0
T11	0	198	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T29	0	1903	0	0
T56	0	655	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1813	0	0
T1	68287	1	0	0
T2	215378	1	0	0
T3	0	1	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T7	0	1	0	0
T8	0	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T11	0	1	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T29	0	1	0	0
T56	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_auto_block_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T16 T27 T28 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T16 T27 T28 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T16 T27 T28 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T16 T27 T28 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T16 T27 T28 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T16 T27 T28 
135        1/1                txn_bits_q <= '0;
           Tests:       T16 T27 T28 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_auto_block_debounce_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T16,T27,T28

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T16,T27,T28
1	1	Covered	T16,T27,T28

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T16,T27,T28

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T16,T27,T28
1	1	Covered	T16,T27,T28

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_auto_block_debounce_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T16,T27,T28
0	0	1	Covered	T16,T27,T28
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T16,T27,T28
0	0	1	Covered	T16,T27,T28
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_auto_block_debounce_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1085685	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1176	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1085685	0	0
T3	227326	0	0	0
T6	228052	0	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	531	0	0
T16	337249	6495	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T26	246037	0	0	0
T27	0	7255	0	0
T28	0	8726	0	0
T58	0	8392	0	0
T59	0	6761	0	0
T60	0	1541	0	0
T61	0	6579	0	0
T62	0	6404	0	0
T63	0	5309	0	0
T64	192966	0	0	0
T65	171158	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1176	0	0
T3	227326	0	0	0
T6	228052	0	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	2	0	0
T16	337249	4	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T26	246037	0	0	0
T27	0	4	0	0
T28	0	5	0	0
T58	0	5	0	0
T59	0	4	0	0
T60	0	4	0	0
T61	0	4	0	0
T62	0	4	0	0
T63	0	3	0	0
T64	192966	0	0	0
T65	171158	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_auto_block_out_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T16 T27 T28 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T16 T27 T28 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T16 T27 T28 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T16 T27 T28 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T16 T27 T28 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T16 T27 T28 
135        1/1                txn_bits_q <= '0;
           Tests:       T16 T27 T28 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_auto_block_out_ctl_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T16,T27,T28

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T16,T27,T28
1	1	Covered	T16,T27,T28

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T16,T27,T28

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T16,T27,T28
1	1	Covered	T16,T27,T28

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_auto_block_out_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T16,T27,T28
0	0	1	Covered	T16,T27,T28
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T16,T27,T28
0	0	1	Covered	T16,T27,T28
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_auto_block_out_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	989431	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1110	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	989431	0	0
T3	227326	0	0	0
T6	228052	0	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	266	0	0
T16	337249	4488	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T26	246037	0	0	0
T27	0	5287	0	0
T28	0	5025	0	0
T58	0	4930	0	0
T59	0	4793	0	0
T60	0	1039	0	0
T61	0	4693	0	0
T62	0	4407	0	0
T63	0	5282	0	0
T64	192966	0	0	0
T65	171158	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1110	0	0
T3	227326	0	0	0
T6	228052	0	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	1	0	0
T16	337249	3	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T26	246037	0	0	0
T27	0	3	0	0
T28	0	3	0	0
T58	0	3	0	0
T59	0	3	0	0
T60	0	3	0	0
T61	0	3	0	0
T62	0	3	0	0
T63	0	3	0	0
T64	192966	0	0	0
T65	171158	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T8 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T8 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T8 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T8 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T8 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T8 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T8 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T8,T29

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T8,T29
1	1	Covered	T1,T8,T29

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T8,T29

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T8,T29
1	1	Covered	T1,T8,T29

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T8,T29
0	0	1	Covered	T1,T8,T29
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T8,T29
0	0	1	Covered	T1,T8,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	7079823	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	7155	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7079823	0	0
T1	68287	392	0	0
T2	215378	0	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1912	0	0
T12	0	3067	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	29196	0	0
T29	0	1917	0	0
T30	0	22132	0	0
T31	0	56014	0	0
T42	0	34790	0	0
T56	0	707	0	0
T91	0	379	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7155	0	0
T1	68287	1	0	0
T2	215378	0	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1	0	0
T12	0	11	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	87	0	0
T29	0	1	0	0
T30	0	51	0	0
T31	0	51	0	0
T42	0	85	0	0
T56	0	1	0	0
T91	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	7000056	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	7109	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7000056	0	0
T12	651560	3019	0	0
T19	247972	0	0	0
T20	811870	23985	0	0
T30	0	21922	0	0
T31	0	55285	0	0
T38	64431	0	0	0
T42	0	33715	0	0
T55	0	18245	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	55701	0	0
T93	0	20008	0	0
T94	0	82747	0	0
T95	0	111976	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7109	0	0
T12	651560	11	0	0
T19	247972	0	0	0
T20	811870	73	0	0
T30	0	51	0	0
T31	0	51	0	0
T38	64431	0	0	0
T42	0	85	0	0
T55	0	11	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	70	0	0
T93	0	51	0	0
T94	0	51	0	0
T95	0	67	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	6811298	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	6952	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	6811298	0	0
T12	651560	3016	0	0
T19	247972	0	0	0
T20	811870	28547	0	0
T30	0	21712	0	0
T31	0	54534	0	0
T38	64431	0	0	0
T42	0	26723	0	0
T55	0	18211	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	51815	0	0
T93	0	19289	0	0
T94	0	82537	0	0
T95	0	107316	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	6952	0	0
T12	651560	11	0	0
T19	247972	0	0	0
T20	811870	87	0	0
T30	0	51	0	0
T31	0	51	0	0
T38	64431	0	0	0
T42	0	69	0	0
T55	0	11	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	65	0	0
T93	0	51	0	0
T94	0	51	0	0
T95	0	65	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	7095073	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	7248	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7095073	0	0
T12	651560	3030	0	0
T19	247972	0	0	0
T20	811870	19596	0	0
T30	0	21502	0	0
T31	0	53867	0	0
T38	64431	0	0	0
T42	0	23353	0	0
T55	0	18264	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	60061	0	0
T93	0	18600	0	0
T94	0	82327	0	0
T95	0	158854	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7248	0	0
T12	651560	11	0	0
T19	247972	0	0	0
T20	811870	61	0	0
T30	0	51	0	0
T31	0	51	0	0
T38	64431	0	0	0
T42	0	61	0	0
T55	0	11	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	76	0	0
T93	0	51	0	0
T94	0	51	0	0
T95	0	97	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_0_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T8 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T8 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T8 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T8 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T8 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T8 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T8 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_0_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T8,T29

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T8,T29
1	1	Covered	T1,T8,T29

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T8,T29

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T8,T29
1	1	Covered	T1,T8,T29

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_0_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T8,T29
0	0	1	Covered	T1,T8,T29
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T8,T29
0	0	1	Covered	T1,T8,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_0_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1050096	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1164	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1050096	0	0
T1	68287	387	0	0
T2	215378	0	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1897	0	0
T12	0	2377	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	758	0	0
T29	0	1915	0	0
T30	0	358	0	0
T31	0	1265	0	0
T42	0	1141	0	0
T56	0	701	0	0
T91	0	362	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1164	0	0
T1	68287	1	0	0
T2	215378	0	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1	0	0
T12	0	9	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	2	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T42	0	3	0	0
T56	0	1	0	0
T91	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_1_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_1_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_1_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_1_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1058432	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1190	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1058432	0	0
T12	651560	2331	0	0
T19	247972	0	0	0
T20	811870	738	0	0
T30	0	348	0	0
T31	0	1232	0	0
T38	64431	0	0	0
T42	0	1032	0	0
T55	0	14750	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	909	0	0
T93	0	443	0	0
T94	0	1428	0	0
T95	0	1864	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1190	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T38	64431	0	0	0
T42	0	3	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0
T93	0	1	0	0
T94	0	1	0	0
T95	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_2_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_2_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_2_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_2_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1061862	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1177	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1061862	0	0
T12	651560	2324	0	0
T19	247972	0	0	0
T20	811870	718	0	0
T30	0	338	0	0
T31	0	1201	0	0
T38	64431	0	0	0
T42	0	943	0	0
T55	0	14725	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	899	0	0
T93	0	418	0	0
T94	0	1418	0	0
T95	0	1828	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1177	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T38	64431	0	0	0
T42	0	3	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0
T93	0	1	0	0
T94	0	1	0	0
T95	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_3_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_3_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_3_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_pre_det_ctl_3_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	993825	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1157	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	993825	0	0
T12	651560	2332	0	0
T19	247972	0	0	0
T20	811870	698	0	0
T30	0	328	0	0
T31	0	1171	0	0
T38	64431	0	0	0
T42	0	967	0	0
T55	0	14786	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	889	0	0
T93	0	392	0	0
T94	0	1408	0	0
T95	0	1777	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1157	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T38	64431	0	0	0
T42	0	3	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0
T93	0	1	0	0
T94	0	1	0	0
T95	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_0_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T2 T8 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T2 T8 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T2 T8 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T2 T8 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T2 T8 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T2 T8 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T2 T8 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_0_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T8

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T2,T8
1	1	Covered	T1,T2,T8

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T8

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T2,T8
1	1	Covered	T1,T2,T8

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_0_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T8
0	0	1	Covered	T1,T2,T8
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T8
0	0	1	Covered	T1,T2,T8
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_0_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	7720264	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	7758	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7720264	0	0
T1	68287	367	0	0
T2	215378	1778	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1879	0	0
T9	0	1979	0	0
T10	0	1355	0	0
T12	0	2959	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	29358	0	0
T29	0	1911	0	0
T56	0	684	0	0
T57	0	1497	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7758	0	0
T1	68287	1	0	0
T2	215378	1	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	11	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	87	0	0
T29	0	1	0	0
T56	0	1	0	0
T57	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_1_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_1_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_1_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_1_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	7565438	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	7636	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7565438	0	0
T12	651560	2890	0	0
T19	247972	0	0	0
T20	811870	24119	0	0
T30	0	22018	0	0
T31	0	55615	0	0
T32	0	2032	0	0
T38	64431	0	0	0
T40	0	998	0	0
T42	0	34226	0	0
T43	0	6300	0	0
T55	0	18056	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	55835	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7636	0	0
T12	651560	11	0	0
T19	247972	0	0	0
T20	811870	73	0	0
T30	0	51	0	0
T31	0	51	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	85	0	0
T43	0	14	0	0
T55	0	11	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	70	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	7436977	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	7572	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7436977	0	0
T12	651560	2871	0	0
T19	247972	0	0	0
T20	811870	28709	0	0
T30	0	21808	0	0
T31	0	54881	0	0
T32	0	2022	0	0
T38	64431	0	0	0
T40	0	994	0	0
T42	0	27180	0	0
T43	0	6185	0	0
T55	0	18008	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	51939	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7572	0	0
T12	651560	11	0	0
T19	247972	0	0	0
T20	811870	87	0	0
T30	0	51	0	0
T31	0	51	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	69	0	0
T43	0	14	0	0
T55	0	11	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	65	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	7675970	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	7812	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7675970	0	0
T12	651560	2899	0	0
T19	247972	0	0	0
T20	811870	19706	0	0
T30	0	21598	0	0
T31	0	54169	0	0
T32	0	2012	0	0
T38	64431	0	0	0
T40	0	990	0	0
T42	0	23690	0	0
T43	0	6092	0	0
T55	0	18068	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	60207	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	7812	0	0
T12	651560	11	0	0
T19	247972	0	0	0
T20	811870	61	0	0
T30	0	51	0	0
T31	0	51	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	61	0	0
T43	0	14	0	0
T55	0	11	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	76	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T2 T8 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T2 T8 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T2 T8 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T2 T8 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T2 T8 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T2 T8 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T2 T8 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T8

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T2,T8
1	1	Covered	T1,T2,T8

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T8

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T2,T8
1	1	Covered	T1,T2,T8

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T8
0	0	1	Covered	T1,T2,T8
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T8
0	0	1	Covered	T1,T2,T8
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1625023	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1747	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1625023	0	0
T1	68287	356	0	0
T2	215378	1776	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1868	0	0
T9	0	1965	0	0
T10	0	1353	0	0
T12	0	2265	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	750	0	0
T29	0	1909	0	0
T56	0	676	0	0
T57	0	1495	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1747	0	0
T1	68287	1	0	0
T2	215378	1	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	9	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	2	0	0
T29	0	1	0	0
T56	0	1	0	0
T57	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1608605	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1781	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1608605	0	0
T12	651560	2207	0	0
T19	247972	0	0	0
T20	811870	730	0	0
T30	0	344	0	0
T31	0	1217	0	0
T32	0	1992	0	0
T38	64431	0	0	0
T40	0	982	0	0
T42	0	996	0	0
T43	0	5896	0	0
T55	0	14580	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	905	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1781	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	3	0	0
T43	0	14	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1565163	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1752	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1565163	0	0
T12	651560	2259	0	0
T19	247972	0	0	0
T20	811870	710	0	0
T30	0	334	0	0
T31	0	1188	0	0
T32	0	1982	0	0
T38	64431	0	0	0
T40	0	978	0	0
T42	0	913	0	0
T43	0	5781	0	0
T55	0	14508	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	895	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1752	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	3	0	0
T43	0	14	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1588395	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1784	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1588395	0	0
T12	651560	2216	0	0
T19	247972	0	0	0
T20	811870	690	0	0
T30	0	324	0	0
T31	0	1161	0	0
T32	0	1972	0	0
T38	64431	0	0	0
T40	0	974	0	0
T42	0	1156	0	0
T43	0	5668	0	0
T55	0	14590	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	885	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1784	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	3	0	0
T43	0	14	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T1 T2 T8 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T2 T8 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T2 T8 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T2 T8 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T2 T8 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T2 T8 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T2 T8 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T8

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T1,T2,T8
1	1	Covered	T1,T2,T8

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T1,T2,T8

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T2,T8
1	1	Covered	T1,T2,T8

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T8
0	0	1	Covered	T1,T2,T8
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T1,T2,T8
0	0	1	Covered	T1,T2,T8
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1625910	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1778	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1625910	0	0
T1	68287	350	0	0
T2	215378	1774	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1862	0	0
T9	0	1955	0	0
T10	0	1351	0	0
T12	0	2209	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	746	0	0
T29	0	1907	0	0
T56	0	669	0	0
T57	0	1493	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1778	0	0
T1	68287	1	0	0
T2	215378	1	0	0
T4	55930	0	0	0
T5	235905	0	0	0
T8	0	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	9	0	0
T13	202586	0	0	0
T14	128132	0	0	0
T15	173596	0	0	0
T16	337249	0	0	0
T17	159909	0	0	0
T18	57201	0	0	0
T20	0	2	0	0
T29	0	1	0	0
T56	0	1	0	0
T57	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1602494	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1759	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1602494	0	0
T12	651560	2166	0	0
T19	247972	0	0	0
T20	811870	726	0	0
T30	0	342	0	0
T31	0	1206	0	0
T32	0	1952	0	0
T38	64431	0	0	0
T40	0	966	0	0
T42	0	973	0	0
T43	0	5448	0	0
T55	0	14484	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	903	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1759	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	3	0	0
T43	0	14	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1588585	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1775	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1588585	0	0
T12	651560	2211	0	0
T19	247972	0	0	0
T20	811870	706	0	0
T30	0	332	0	0
T31	0	1180	0	0
T32	0	1942	0	0
T38	64431	0	0	0
T40	0	962	0	0
T42	0	1011	0	0
T43	0	5352	0	0
T55	0	14431	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	893	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1775	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	3	0	0
T43	0	14	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T12 T20 T30 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T12 T20 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T12 T20 T30 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T12 T20 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T12 T20 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T12 T20 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T12 T20 T30 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

	Total	Covered	Percent
Conditions	11	10	90.91
Logical	11	10	90.91
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T12,T20,T30
1	1	Covered	T12,T20,T30

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T12,T20,T30
0	0	1	Covered	T12,T20,T30
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	1556427	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	1752	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1556427	0	0
T12	651560	2168	0	0
T19	247972	0	0	0
T20	811870	686	0	0
T30	0	322	0	0
T31	0	1151	0	0
T32	0	1932	0	0
T38	64431	0	0	0
T40	0	958	0	0
T42	0	1135	0	0
T43	0	5267	0	0
T55	0	14503	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	883	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1752	0	0
T12	651560	9	0	0
T19	247972	0	0	0
T20	811870	2	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	0	5	0	0
T38	64431	0	0	0
T40	0	2	0	0
T42	0	3	0	0
T43	0	14	0	0
T55	0	9	0	0
T66	31354	0	0	0
T67	84962	0	0	0
T68	110983	0	0	0
T80	224761	0	0	0
T89	63351	0	0	0
T90	65687	0	0	0
T92	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0

Line Coverage for Instance : tb.dut.u_reg.u_ulp_ctl_cdc

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	65	1	1	100.00
ALWAYS	71	6	6	100.00
CONT_ASSIGN	85	1	1	100.00
CONT_ASSIGN	109	1	1	100.00
ALWAYS	115	9	9	100.00
CONT_ASSIGN	150	1	1	100.00
CONT_ASSIGN	155	1	1	100.00
CONT_ASSIGN	156	1	1	100.00
CONT_ASSIGN	200	1	1	100.00

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T6 T12 T19 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T6 T12 T19 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T6 T12 T19 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T6 T12 T19 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T6 T12 T19 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T6 T12 T19 
135        1/1                txn_bits_q <= '0;
           Tests:       T6 T12 T19 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_ulp_ctl_cdc

	Total	Covered	Percent
Conditions	13	12	92.31
Logical	13	12	92.31
Non-Logical	0	0
Event	0	0

 LINE       65
 EXPRESSION (src_we_i | src_re_i)
             ----1---   ----2---

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T19

 LINE       109
 EXPRESSION (src_busy_q & ((!src_ack)))
             -----1----   ------2-----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T6,T12,T19
1	1	Covered	T6,T12,T19

 LINE       123
 EXPRESSION (src_wd_i & BitMask)
             ----1---   ---2---

-1-	-2-	Status	Tests
0	-	Covered	T6,T12,T19
1	-	Covered	T6,T12,T19

 LINE       125
 EXPRESSION ((src_busy_q && src_ack) || (src_update && ((!busy))))
             -----------1-----------    ------------2------------

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T6,T12,T19

 LINE       125
 SUB-EXPRESSION (src_busy_q && src_ack)
                 -----1----    ---2---

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T6,T12,T19
1	1	Covered	T6,T12,T19

 LINE       125
 SUB-EXPRESSION (src_update && ((!busy)))
                 -----1----    ----2----

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Unreachable
1	1	Unreachable

---

Branch Coverage for Instance : tb.dut.u_reg.u_ulp_ctl_cdc

	Line No.	Total	Covered	Percent
Branches		8	8	100.00
IF	71	4	4	100.00
IF	115	4	4	100.00

71             if (!rst_src_ni) begin
               -1-  
72               src_busy_q <= '0;
                 ==>
73             end else if (src_req) begin
                        -2-  
74               src_busy_q <= 1'b1;
                 ==>
75             end else if (src_ack) begin
                        -3-  
76               src_busy_q <= 1'b0;
                 ==>
77             end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T19
0	0	1	Covered	T6,T12,T19
0	0	0	Covered	T1,T4,T5

115            if (!rst_src_ni) begin
               -1-  
116              src_q <= ResetVal;
                 ==>
117              txn_bits_q <= '0;
118            end else if (src_req) begin
                        -2-  
119              // See assertion below
120              // At the beginning of a software initiated transaction, the following
121              // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122              // change for the duration of the synchronization operation.
123              src_q <= src_wd_i & BitMask;
                 ==>
124              txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
125            end else if (src_busy_q && src_ack || src_update && !busy) begin
                        -3-  
126              // sample data whenever a busy transaction finishes OR
127              // when an update pulse is seen.
128              // TODO: We should add a cover group to test different sync timings
129              // between src_ack and src_update. ie. there can be 3 scenarios:
130              // 1. update one cycle before ack
131              // 2. ack one cycle before update
132              // 3. update / ack on the same cycle
133              // During all 3 cases the read data should be correct
134              src_q <= dst_qs;
                 ==>
135              txn_bits_q <= '0;
136            end
               MISSING_ELSE
               ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T6,T12,T19
0	0	1	Covered	T6,T12,T19
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_ulp_ctl_cdc

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	4	4	100.00	4	100.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	4	4	100.00	4	100.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1278357336	863208	0	0
DstReqKnown_A	7625041	6956296	0	0
SrcAckBusyChk_A	1278357336	972	0	0
SrcBusyKnown_A	1278357336	1277929763	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	863208	0	0
T6	228052	3421	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	1039	0	0
T19	0	7415	0	0
T25	22809	0	0	0
T38	0	1614	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	1419	0	0
T70	0	1436	0	0
T71	0	1670	0	0
T72	0	3896	0	0
T73	0	612	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0
T79	0	200	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	7625041	6956296	0	0
T1	505	105	0	0
T2	483	83	0	0
T4	447	47	0	0
T5	496	96	0	0
T13	422	22	0	0
T14	523	123	0	0
T15	708	308	0	0
T16	674	274	0	0
T17	1522	47	0	0
T18	497	97	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	972	0	0
T6	228052	2	0	0
T8	243794	0	0	0
T9	242589	0	0	0
T12	0	4	0	0
T19	0	4	0	0
T25	22809	0	0	0
T38	0	4	0	0
T64	192966	0	0	0
T65	171158	0	0	0
T69	0	4	0	0
T70	0	2	0	0
T71	0	4	0	0
T72	0	2	0	0
T73	0	4	0	0
T74	250973	0	0	0
T75	130915	0	0	0
T76	211853	0	0	0
T77	44667	0	0	0
T79	0	2	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1278357336	1277929763	0	0
T1	68287	68227	0	0
T2	215378	215323	0	0
T4	55930	55873	0	0
T5	235905	235818	0	0
T13	202586	202518	0	0
T14	128132	128047	0	0
T15	173596	173500	0	0
T16	337249	337169	0	0
T17	159909	158990	0	0
T18	57201	57150	0	0