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_08_31/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 T15 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T15 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T15 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T15 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T15 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T4,T1,T15

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T4,T1,T15
1	1	Covered	T4,T1,T15

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T4,T1,T15

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T1,T15
1	1	Covered	T4,T1,T15

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T11,T21,T28
1	1	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	-	Covered	T11,T21,T34
1	-	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Covered	T1,T2,T3
1	0	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T11,T21,T28
1	1	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

---

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	88821717	0	0
DstReqKnown_A	290649170	268453154	0	0
SrcAckBusyChk_A	2147483647	102524	0	0
SrcBusyKnown_A	2147483647	2147483647	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	88821717	0	0
T1	249622	1407	0	0
T2	160572	0	0	0
T3	117341	961	0	0
T7	177804	0	0	0
T8	27362	0	0	0
T9	0	345	0	0
T10	0	395	0	0
T12	0	1901	0	0
T14	53100	0	0	0
T15	217292	1465	0	0
T16	251188	0	0	0
T17	54679	449	0	0
T18	219434	0	0	0
T19	777972	2878	0	0
T20	416523	0	0	0
T29	474054	0	0	0
T30	40426	0	0	0
T31	152096	0	0	0
T32	0	14172	0	0
T33	0	15928	0	0
T34	825416	5808	0	0
T35	0	647	0	0
T36	0	4847	0	0
T60	0	716	0	0
T61	0	1891	0	0
T62	0	307	0	0
T63	0	6133	0	0
T64	0	9739	0	0
T65	0	4231	0	0
T66	0	2794	0	0
T67	0	5683	0	0
T68	398486	0	0	0
T69	497980	0	0	0
T70	202176	0	0	0
T71	192078	0	0	0
T72	68279	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	290649170	268453154	0	0
T1	17306	3706	0	0
T2	22270	8670	0	0
T4	16898	3298	0	0
T5	14110	510	0	0
T6	14382	782	0	0
T14	14416	816	0	0
T15	15062	1462	0	0
T16	17034	3434	0	0
T17	16150	2550	0	0
T23	25704	272	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	102524	0	0
T1	249622	1	0	0
T2	160572	0	0	0
T3	117341	1	0	0
T7	177804	0	0	0
T8	27362	0	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	1	0	0
T14	53100	0	0	0
T15	217292	1	0	0
T16	251188	0	0	0
T17	54679	1	0	0
T18	219434	0	0	0
T19	777972	6	0	0
T20	416523	0	0	0
T29	474054	0	0	0
T30	40426	0	0	0
T31	152096	0	0	0
T32	0	8	0	0
T33	0	8	0	0
T34	825416	12	0	0
T35	0	9	0	0
T36	0	12	0	0
T60	0	1	0	0
T61	0	1	0	0
T62	0	1	0	0
T63	0	8	0	0
T64	0	6	0	0
T65	0	9	0	0
T66	0	7	0	0
T67	0	8	0	0
T68	398486	0	0	0
T69	497980	0	0	0
T70	202176	0	0	0
T71	192078	0	0	0
T72	68279	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	2147483647	0	0
T1	8487148	8485108	0	0
T2	5459448	5456626	0	0
T4	4227764	4224432	0	0
T5	2261238	2259504	0	0
T6	3453788	3451680	0	0
T14	1805400	1802068	0	0
T15	7387928	7385888	0	0
T16	8540392	8537536	0	0
T17	1859086	1857182	0	0
T23	3088900	3055614	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:       T11 T21 T22 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T11 T21 T22 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T11 T21 T22 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T11 T21 T22 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T11 T21 T22 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T21,T22

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T11,T21,T22
1	1	Covered	T11,T21,T22

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

-1-	-2-	Status	Tests
0	-	Covered	T39,T41,T24
1	-	Covered	T11,T21,T22

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Covered	T1,T2,T3
1	0	Covered	T11,T21,T22

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T11,T21,T22
1	1	Covered	T11,T21,T22

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T11,T21,T22
0	0	1	Covered	T11,T21,T22
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T11,T21,T22
0	0	1	Covered	T1,T2,T3
0	0	0	Covered	T4,T5,T6

---

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	1026056372	970646	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1096	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	970646	0	0
T11	47466	292	0	0
T12	242367	0	0	0
T21	0	1972	0	0
T22	0	686	0	0
T27	203927	0	0	0
T46	0	378	0	0
T49	0	117	0	0
T60	108358	0	0	0
T73	0	1612	0	0
T74	0	473	0	0
T75	0	1878	0	0
T76	0	791	0	0
T77	0	3398	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1096	0	0
T11	47466	1	0	0
T12	242367	0	0	0
T21	0	1	0	0
T22	0	2	0	0
T27	203927	0	0	0
T46	0	2	0	0
T49	0	1	0	0
T60	108358	0	0	0
T73	0	1	0	0
T74	0	1	0	0
T75	0	1	0	0
T76	0	1	0	0
T77	0	2	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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 T15 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T15 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T15 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T15 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T15 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T15,T17
1	1	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T15,T17
1	1	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1485360	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1791	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1485360	0	0
T1	249622	1396	0	0
T2	160572	0	0	0
T3	117341	938	0	0
T9	0	323	0	0
T10	0	384	0	0
T12	0	1890	0	0
T14	53100	0	0	0
T15	217292	1461	0	0
T16	251188	0	0	0
T17	54679	445	0	0
T18	219434	0	0	0
T19	259324	475	0	0
T20	138841	0	0	0
T84	0	360	0	0
T85	0	1758	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1791	0	0
T1	249622	1	0	0
T2	160572	0	0	0
T3	117341	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	1	0	0
T14	53100	0	0	0
T15	217292	1	0	0
T16	251188	0	0	0
T17	54679	1	0	0
T18	219434	0	0	0
T19	259324	1	0	0
T20	138841	0	0	0
T84	0	1	0	0
T85	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T11 T27 T21 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T11 T27 T21 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T11 T27 T21 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T11 T27 T21 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T11 T27 T21 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T11 T27 T21 
135        1/1                txn_bits_q <= '0;
           Tests:       T11 T27 T21 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T11,T27,T21
1	1	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T11,T27,T21
1	1	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T11,T27,T21
0	0	1	Covered	T11,T27,T21
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T11,T27,T21
0	0	1	Covered	T11,T27,T21
0	0	0	Covered	T4,T5,T6

---

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	1026056372	797275	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	944	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	797275	0	0
T11	47466	894	0	0
T12	242367	0	0	0
T21	0	4977	0	0
T22	0	739	0	0
T27	203927	1968	0	0
T28	0	695	0	0
T34	0	420	0	0
T36	0	481	0	0
T60	108358	0	0	0
T73	0	1618	0	0
T74	0	1437	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0
T86	0	317	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	944	0	0
T11	47466	3	0	0
T12	242367	0	0	0
T21	0	3	0	0
T22	0	2	0	0
T27	203927	1	0	0
T28	0	1	0	0
T34	0	1	0	0
T36	0	1	0	0
T60	108358	0	0	0
T73	0	1	0	0
T74	0	3	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0
T86	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T11 T27 T21 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T11 T27 T21 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T11 T27 T21 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T11 T27 T21 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T11 T27 T21 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T11 T27 T21 
135        1/1                txn_bits_q <= '0;
           Tests:       T11 T27 T21 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T11,T27,T21
1	1	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T11,T27,T21
1	1	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T11,T27,T21
0	0	1	Covered	T11,T27,T21
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T11,T27,T21
0	0	1	Covered	T11,T27,T21
0	0	0	Covered	T4,T5,T6

---

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	1026056372	811090	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	940	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	811090	0	0
T11	47466	888	0	0
T12	242367	0	0	0
T21	0	4949	0	0
T22	0	710	0	0
T27	203927	1962	0	0
T28	0	688	0	0
T34	0	418	0	0
T36	0	479	0	0
T60	108358	0	0	0
T73	0	1616	0	0
T74	0	1431	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0
T86	0	315	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	940	0	0
T11	47466	3	0	0
T12	242367	0	0	0
T21	0	3	0	0
T22	0	2	0	0
T27	203927	1	0	0
T28	0	1	0	0
T34	0	1	0	0
T36	0	1	0	0
T60	108358	0	0	0
T73	0	1	0	0
T74	0	3	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0
T86	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T11 T27 T21 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T11 T27 T21 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T11 T27 T21 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T11 T27 T21 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T11 T27 T21 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T11 T27 T21 
135        1/1                txn_bits_q <= '0;
           Tests:       T11 T27 T21 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T11,T27,T21
1	1	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T11,T27,T21
1	1	Covered	T11,T27,T21

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T11,T27,T21
0	0	1	Covered	T11,T27,T21
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T11,T27,T21
0	0	1	Covered	T11,T27,T21
0	0	0	Covered	T4,T5,T6

---

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	1026056372	808865	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	929	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	808865	0	0
T11	47466	882	0	0
T12	242367	0	0	0
T21	0	4931	0	0
T22	0	686	0	0
T27	203927	1950	0	0
T28	0	681	0	0
T34	0	416	0	0
T36	0	477	0	0
T60	108358	0	0	0
T73	0	1614	0	0
T74	0	1425	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0
T86	0	313	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	929	0	0
T11	47466	3	0	0
T12	242367	0	0	0
T21	0	3	0	0
T22	0	2	0	0
T27	203927	1	0	0
T28	0	1	0	0
T34	0	1	0	0
T36	0	1	0	0
T60	108358	0	0	0
T73	0	1	0	0
T74	0	3	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0
T86	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T4 T29 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T4 T29 T30 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T4 T29 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T4 T29 T30 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T4 T29 T30 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T4 T29 T30 
135        1/1                txn_bits_q <= '0;
           Tests:       T4 T29 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T4,T29,T30

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T4,T29,T30
1	1	Covered	T4,T29,T30

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T4,T29,T30

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T29,T30
1	1	Covered	T4,T29,T30

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T4,T29,T30
0	0	1	Covered	T4,T29,T30
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T4,T29,T30
0	0	1	Covered	T4,T29,T30
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1684907	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	2081	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1684907	0	0
T1	249622	0	0	0
T2	160572	0	0	0
T4	124346	18383	0	0
T5	66507	0	0	0
T6	101582	0	0	0
T14	53100	0	0	0
T15	217292	0	0	0
T16	251188	0	0	0
T17	54679	0	0	0
T23	90850	0	0	0
T29	0	32389	0	0
T30	0	2593	0	0
T71	0	27180	0	0
T81	0	10272	0	0
T83	0	6699	0	0
T87	0	8287	0	0
T88	0	8377	0	0
T89	0	2802	0	0
T90	0	33502	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	2081	0	0
T1	249622	0	0	0
T2	160572	0	0	0
T4	124346	20	0	0
T5	66507	0	0	0
T6	101582	0	0	0
T14	53100	0	0	0
T15	217292	0	0	0
T16	251188	0	0	0
T17	54679	0	0	0
T23	90850	0	0	0
T29	0	20	0	0
T30	0	20	0	0
T71	0	20	0	0
T81	0	20	0	0
T83	0	20	0	0
T87	0	20	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	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T4 T16 T18 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T4 T16 T18 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T4 T16 T18 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T4 T16 T18 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T4 T16 T18 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T4 T16 T18 
135        1/1                txn_bits_q <= '0;
           Tests:       T4 T16 T18 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T4,T16,T18

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T4,T16,T18
1	1	Covered	T4,T16,T18

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T4,T16,T18

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T16,T18
1	1	Covered	T4,T16,T18

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T4,T16,T18
0	0	1	Covered	T4,T16,T18
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T4,T16,T18
0	0	1	Covered	T4,T16,T18
0	0	0	Covered	T4,T5,T6

---

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	1026056372	3552411	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	4145	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	3552411	0	0
T1	249622	0	0	0
T2	160572	0	0	0
T4	124346	992	0	0
T5	66507	0	0	0
T6	101582	0	0	0
T10	0	9148	0	0
T14	53100	0	0	0
T15	217292	0	0	0
T16	251188	36616	0	0
T17	54679	0	0	0
T18	0	28022	0	0
T23	90850	0	0	0
T29	0	1437	0	0
T30	0	148	0	0
T31	0	9787	0	0
T69	0	35072	0	0
T81	0	575	0	0
T91	0	23074	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	4145	0	0
T1	249622	0	0	0
T2	160572	0	0	0
T4	124346	1	0	0
T5	66507	0	0	0
T6	101582	0	0	0
T10	0	20	0	0
T14	53100	0	0	0
T15	217292	0	0	0
T16	251188	20	0	0
T17	54679	0	0	0
T18	0	20	0	0
T23	90850	0	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	20	0	0
T69	0	20	0	0
T81	0	1	0	0
T91	0	20	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T4 T1 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T4 T1 T15 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T4 T1 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T4 T1 T15 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T4 T1 T15 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T4 T1 T15 
135        1/1                txn_bits_q <= '0;
           Tests:       T4 T1 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T4,T1,T15

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T4,T1,T15
1	1	Covered	T4,T1,T15

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T4,T1,T15

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T1,T15
1	1	Covered	T4,T1,T15

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T4,T1,T15
0	0	1	Covered	T4,T1,T15
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T4,T1,T15
0	0	1	Covered	T4,T1,T15
0	0	0	Covered	T4,T5,T6

---

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	1026056372	4392281	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	5105	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	4392281	0	0
T1	249622	1429	0	0
T2	160572	0	0	0
T3	0	978	0	0
T4	124346	1000	0	0
T5	66507	0	0	0
T6	101582	0	0	0
T14	53100	0	0	0
T15	217292	1469	0	0
T16	251188	36918	0	0
T17	54679	453	0	0
T18	0	28451	0	0
T19	0	477	0	0
T23	90850	0	0	0
T29	0	1450	0	0
T31	0	9867	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	5105	0	0
T1	249622	1	0	0
T2	160572	0	0	0
T3	0	1	0	0
T4	124346	1	0	0
T5	66507	0	0	0
T6	101582	0	0	0
T14	53100	0	0	0
T15	217292	1	0	0
T16	251188	20	0	0
T17	54679	1	0	0
T18	0	20	0	0
T19	0	1	0	0
T23	90850	0	0	0
T29	0	1	0	0
T31	0	20	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T16 T18 T31 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T16 T18 T31 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T16 T18 T31 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T18 T31 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T16 T18 T31 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T18 T31 
135        1/1                txn_bits_q <= '0;
           Tests:       T16 T18 T31 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T16,T18,T31

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T16,T18,T31
1	1	Covered	T16,T18,T31

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T16,T18,T31

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T16,T18,T31
1	1	Covered	T16,T18,T31

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T16,T18,T31
0	0	1	Covered	T16,T18,T31
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T16,T18,T31
0	0	1	Covered	T16,T18,T31
0	0	0	Covered	T4,T5,T6

---

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	1026056372	3511666	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	4077	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	3511666	0	0
T2	160572	0	0	0
T3	117341	0	0	0
T7	88902	0	0	0
T10	0	9266	0	0
T16	251188	36784	0	0
T17	54679	0	0	0
T18	219434	28228	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T29	237027	0	0	0
T31	76048	9827	0	0
T69	0	35112	0	0
T83	0	6666	0	0
T87	0	8084	0	0
T91	0	23218	0	0
T92	0	33087	0	0
T93	0	36378	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	4077	0	0
T2	160572	0	0	0
T3	117341	0	0	0
T7	88902	0	0	0
T10	0	20	0	0
T16	251188	20	0	0
T17	54679	0	0	0
T18	219434	20	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T29	237027	0	0	0
T31	76048	20	0	0
T69	0	20	0	0
T83	0	20	0	0
T87	0	20	0	0
T91	0	20	0	0
T92	0	20	0	0
T93	0	20	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T2 T7 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T2 T7 T8 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T2 T7 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T2 T7 T8 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T2 T7 T8 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T2 T7 T8 
135        1/1                txn_bits_q <= '0;
           Tests:       T2 T7 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T2,T7,T8

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T2,T7,T8
1	1	Covered	T2,T7,T8

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T2,T7,T8

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T2,T7,T8
1	1	Covered	T2,T7,T8

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T2,T7,T8
0	0	1	Covered	T2,T7,T8
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T2,T7,T8
0	0	1	Covered	T2,T7,T8
0	0	0	Covered	T4,T5,T6

---

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	1026056372	754025	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	931	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	754025	0	0
T2	160572	977	0	0
T3	117341	0	0	0
T7	88902	483	0	0
T8	0	68	0	0
T13	0	1037	0	0
T17	54679	0	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T29	237027	0	0	0
T31	76048	0	0	0
T34	0	14101	0	0
T36	0	11596	0	0
T50	0	210	0	0
T51	0	517	0	0
T52	0	974	0	0
T68	199243	0	0	0
T94	0	367	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	931	0	0
T2	160572	1	0	0
T3	117341	0	0	0
T7	88902	1	0	0
T8	0	1	0	0
T13	0	1	0	0
T17	54679	0	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T29	237027	0	0	0
T31	76048	0	0	0
T34	0	28	0	0
T36	0	28	0	0
T50	0	1	0	0
T51	0	1	0	0
T52	0	1	0	0
T68	199243	0	0	0
T94	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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 T15 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T15 T2 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T15 T2 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T15 T2 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T15 T2 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T2

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T15,T2
1	1	Covered	T1,T15,T2

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T2

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

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

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T1,T15,T2
0	0	1	Covered	T1,T15,T2
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T1,T15,T2
0	0	1	Covered	T1,T15,T2
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1475224	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1786	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1475224	0	0
T1	249622	1386	0	0
T2	160572	975	0	0
T3	117341	935	0	0
T7	0	464	0	0
T8	0	56	0	0
T9	0	320	0	0
T10	0	379	0	0
T12	0	1888	0	0
T14	53100	0	0	0
T15	217292	1459	0	0
T16	251188	0	0	0
T17	54679	443	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1786	0	0
T1	249622	1	0	0
T2	160572	1	0	0
T3	117341	1	0	0
T7	0	1	0	0
T8	0	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	1	0	0
T14	53100	0	0	0
T15	217292	1	0	0
T16	251188	0	0	0
T17	54679	1	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T19 T32 T33 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T19 T32 T33 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T19 T32 T33 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T19 T32 T33 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T19 T32 T33 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T19 T32 T33 
135        1/1                txn_bits_q <= '0;
           Tests:       T19 T32 T33 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T19,T32,T33

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T19,T32,T33
1	1	Covered	T19,T32,T33

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T19,T32,T33

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T19,T32,T33
1	1	Covered	T19,T32,T33

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T19,T32,T33
0	0	1	Covered	T19,T32,T33
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T19,T32,T33
0	0	1	Covered	T19,T32,T33
0	0	0	Covered	T4,T5,T6

---

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	1026056372	905435	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1125	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	905435	0	0
T7	88902	0	0	0
T8	13681	0	0	0
T19	259324	1442	0	0
T20	138841	0	0	0
T29	237027	0	0	0
T30	20213	0	0	0
T31	76048	0	0	0
T32	0	8992	0	0
T33	0	9980	0	0
T34	0	981	0	0
T36	0	841	0	0
T63	0	3763	0	0
T64	0	4880	0	0
T65	0	2868	0	0
T66	0	1596	0	0
T67	0	3573	0	0
T68	199243	0	0	0
T69	248990	0	0	0
T70	101088	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1125	0	0
T7	88902	0	0	0
T8	13681	0	0	0
T19	259324	3	0	0
T20	138841	0	0	0
T29	237027	0	0	0
T30	20213	0	0	0
T31	76048	0	0	0
T32	0	5	0	0
T33	0	5	0	0
T34	0	2	0	0
T36	0	2	0	0
T63	0	5	0	0
T64	0	3	0	0
T65	0	6	0	0
T66	0	4	0	0
T67	0	5	0	0
T68	199243	0	0	0
T69	248990	0	0	0
T70	101088	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T19 T32 T33 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T19 T32 T33 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T19 T32 T33 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T19 T32 T33 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T19 T32 T33 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T19 T32 T33 
135        1/1                txn_bits_q <= '0;
           Tests:       T19 T32 T33 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T19,T32,T33

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T19,T32,T33
1	1	Covered	T19,T32,T33

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T19,T32,T33

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T19,T32,T33
1	1	Covered	T19,T32,T33

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T19,T32,T33
0	0	1	Covered	T19,T32,T33
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T19,T32,T33
0	0	1	Covered	T19,T32,T33
0	0	0	Covered	T4,T5,T6

---

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	1026056372	829127	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1034	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	829127	0	0
T7	88902	0	0	0
T8	13681	0	0	0
T19	259324	1436	0	0
T20	138841	0	0	0
T29	237027	0	0	0
T30	20213	0	0	0
T31	76048	0	0	0
T32	0	5180	0	0
T33	0	5948	0	0
T34	0	420	0	0
T36	0	481	0	0
T63	0	2370	0	0
T64	0	4859	0	0
T65	0	1363	0	0
T66	0	1198	0	0
T67	0	2110	0	0
T68	199243	0	0	0
T69	248990	0	0	0
T70	101088	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1034	0	0
T7	88902	0	0	0
T8	13681	0	0	0
T19	259324	3	0	0
T20	138841	0	0	0
T29	237027	0	0	0
T30	20213	0	0	0
T31	76048	0	0	0
T32	0	3	0	0
T33	0	3	0	0
T34	0	1	0	0
T36	0	1	0	0
T63	0	3	0	0
T64	0	3	0	0
T65	0	3	0	0
T66	0	3	0	0
T67	0	3	0	0
T68	199243	0	0	0
T69	248990	0	0	0
T70	101088	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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 T17 T12 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T17 T12 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T17 T12 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T17 T12 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T17 T12 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T17 T12 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T17 T12 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T17,T12

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T17,T12
1	1	Covered	T1,T17,T12

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T17,T12

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T17,T12
1	1	Covered	T1,T17,T12

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T1,T17,T12
0	0	1	Covered	T1,T17,T12
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T1,T17,T12
0	0	1	Covered	T1,T17,T12
0	0	0	Covered	T4,T5,T6

---

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	1026056372	6266654	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	6898	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6266654	0	0
T1	249622	1451	0	0
T2	160572	0	0	0
T3	117341	0	0	0
T12	0	1920	0	0
T14	53100	0	0	0
T15	217292	0	0	0
T16	251188	0	0	0
T17	54679	457	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T34	0	5589	0	0
T35	0	5932	0	0
T36	0	4305	0	0
T59	0	24755	0	0
T61	0	1919	0	0
T95	0	1985	0	0
T96	0	71859	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6898	0	0
T1	249622	1	0	0
T2	160572	0	0	0
T3	117341	0	0	0
T12	0	1	0	0
T14	53100	0	0	0
T15	217292	0	0	0
T16	251188	0	0	0
T17	54679	1	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T34	0	11	0	0
T35	0	79	0	0
T36	0	11	0	0
T59	0	78	0	0
T61	0	1	0	0
T95	0	1	0	0
T96	0	51	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	6182342	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	6955	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6182342	0	0
T22	56541	0	0	0
T34	825416	5583	0	0
T35	618686	6009	0	0
T36	809098	4299	0	0
T43	0	20381	0	0
T48	0	20847	0	0
T58	0	29175	0	0
T59	0	22220	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	70807	0	0
T97	0	43120	0	0
T98	0	23473	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6955	0	0
T22	56541	0	0	0
T34	825416	11	0	0
T35	618686	79	0	0
T36	809098	11	0	0
T43	0	78	0	0
T48	0	74	0	0
T58	0	68	0	0
T59	0	73	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	51	0	0
T97	0	69	0	0
T98	0	51	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	5982354	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	6873	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	5982354	0	0
T22	56541	0	0	0
T34	825416	5583	0	0
T35	618686	4523	0	0
T36	809098	4299	0	0
T43	0	15780	0	0
T48	0	19851	0	0
T58	0	22768	0	0
T59	0	18925	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	69842	0	0
T97	0	60499	0	0
T98	0	23263	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6873	0	0
T22	56541	0	0	0
T34	825416	11	0	0
T35	618686	59	0	0
T36	809098	11	0	0
T43	0	64	0	0
T48	0	74	0	0
T58	0	54	0	0
T59	0	65	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	51	0	0
T97	0	97	0	0
T98	0	51	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	5914396	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	6875	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	5914396	0	0
T22	56541	0	0	0
T34	825416	5583	0	0
T35	618686	6094	0	0
T36	809098	4299	0	0
T43	0	16571	0	0
T48	0	17089	0	0
T58	0	28646	0	0
T59	0	18256	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	68712	0	0
T97	0	44660	0	0
T98	0	23053	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6875	0	0
T22	56541	0	0	0
T34	825416	11	0	0
T35	618686	79	0	0
T36	809098	11	0	0
T43	0	66	0	0
T48	0	65	0	0
T58	0	68	0	0
T59	0	65	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	51	0	0
T97	0	74	0	0
T98	0	51	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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 T17 T12 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T17 T12 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T17 T12 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T17 T12 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T17 T12 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T17 T12 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T17 T12 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T17,T12

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T17,T12
1	1	Covered	T1,T17,T12

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T17,T12

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T17,T12
1	1	Covered	T1,T17,T12

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T1,T17,T12
0	0	1	Covered	T1,T17,T12
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T1,T17,T12
0	0	1	Covered	T1,T17,T12
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1038002	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1167	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1038002	0	0
T1	249622	1439	0	0
T2	160572	0	0	0
T3	117341	0	0	0
T12	0	1916	0	0
T14	53100	0	0	0
T15	217292	0	0	0
T16	251188	0	0	0
T17	54679	455	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T34	0	4449	0	0
T35	0	690	0	0
T36	0	3567	0	0
T59	0	1312	0	0
T61	0	1914	0	0
T95	0	1980	0	0
T96	0	1219	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1167	0	0
T1	249622	1	0	0
T2	160572	0	0	0
T3	117341	0	0	0
T12	0	1	0	0
T14	53100	0	0	0
T15	217292	0	0	0
T16	251188	0	0	0
T17	54679	1	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T34	0	9	0	0
T35	0	9	0	0
T36	0	9	0	0
T59	0	4	0	0
T61	0	1	0	0
T95	0	1	0	0
T96	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	987582	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1160	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	987582	0	0
T22	56541	0	0	0
T34	825416	4443	0	0
T35	618686	705	0	0
T36	809098	3561	0	0
T43	0	878	0	0
T48	0	1814	0	0
T58	0	1830	0	0
T59	0	1177	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1176	0	0
T97	0	3940	0	0
T98	0	393	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1160	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T43	0	4	0	0
T48	0	7	0	0
T58	0	4	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T97	0	7	0	0
T98	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	989602	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1185	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	989602	0	0
T22	56541	0	0	0
T34	825416	4443	0	0
T35	618686	681	0	0
T36	809098	3561	0	0
T43	0	986	0	0
T48	0	1841	0	0
T58	0	1790	0	0
T59	0	1042	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1130	0	0
T97	0	3688	0	0
T98	0	383	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1185	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T43	0	4	0	0
T48	0	7	0	0
T58	0	4	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T97	0	7	0	0
T98	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	995934	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1171	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	995934	0	0
T22	56541	0	0	0
T34	825416	4443	0	0
T35	618686	717	0	0
T36	809098	3561	0	0
T43	0	904	0	0
T48	0	1948	0	0
T58	0	1750	0	0
T59	0	1272	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1083	0	0
T97	0	3426	0	0
T98	0	373	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1171	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T43	0	4	0	0
T48	0	7	0	0
T58	0	4	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T97	0	7	0	0
T98	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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 T15 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T15 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T15 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T15 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T15 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T15,T17
1	1	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T15,T17
1	1	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

---

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	1026056372	6768451	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	7443	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6768451	0	0
T1	249622	1417	0	0
T2	160572	0	0	0
T3	117341	973	0	0
T9	0	356	0	0
T10	0	402	0	0
T12	0	1904	0	0
T14	53100	0	0	0
T15	217292	1467	0	0
T16	251188	0	0	0
T17	54679	451	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T60	0	723	0	0
T61	0	1896	0	0
T62	0	309	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	7443	0	0
T1	249622	1	0	0
T2	160572	0	0	0
T3	117341	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	1	0	0
T14	53100	0	0	0
T15	217292	1	0	0
T16	251188	0	0	0
T17	54679	1	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T60	0	1	0	0
T61	0	1	0	0
T62	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	6665539	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	7511	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6665539	0	0
T22	56541	0	0	0
T34	825416	5547	0	0
T35	618686	6128	0	0
T36	809098	4263	0	0
T46	0	1910	0	0
T47	0	498	0	0
T49	0	119	0	0
T57	0	2748	0	0
T59	0	22640	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	71322	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	748	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	7511	0	0
T22	56541	0	0	0
T34	825416	11	0	0
T35	618686	79	0	0
T36	809098	11	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	73	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	51	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	6483095	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	7377	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6483095	0	0
T22	56541	0	0	0
T34	825416	5547	0	0
T35	618686	4526	0	0
T36	809098	4263	0	0
T46	0	1890	0	0
T47	0	487	0	0
T49	0	117	0	0
T57	0	2734	0	0
T59	0	19363	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	70303	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	746	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	7377	0	0
T22	56541	0	0	0
T34	825416	11	0	0
T35	618686	59	0	0
T36	809098	11	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	65	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	51	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	6391514	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	7409	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	6391514	0	0
T22	56541	0	0	0
T34	825416	5547	0	0
T35	618686	5933	0	0
T36	809098	4263	0	0
T46	0	1870	0	0
T47	0	474	0	0
T49	0	115	0	0
T57	0	2720	0	0
T59	0	18649	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	69226	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	744	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	7409	0	0
T22	56541	0	0	0
T34	825416	11	0	0
T35	618686	79	0	0
T36	809098	11	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	65	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	51	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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 T15 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T15 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T15 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T15 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T15 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T15,T17
1	1	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T15,T17
1	1	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1434254	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1700	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1434254	0	0
T1	249622	1407	0	0
T2	160572	0	0	0
T3	117341	961	0	0
T9	0	345	0	0
T10	0	395	0	0
T12	0	1901	0	0
T14	53100	0	0	0
T15	217292	1465	0	0
T16	251188	0	0	0
T17	54679	449	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T60	0	716	0	0
T61	0	1891	0	0
T62	0	307	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1700	0	0
T1	249622	1	0	0
T2	160572	0	0	0
T3	117341	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	1	0	0
T14	53100	0	0	0
T15	217292	1	0	0
T16	251188	0	0	0
T17	54679	1	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T60	0	1	0	0
T61	0	1	0	0
T62	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1437300	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1696	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1437300	0	0
T22	56541	0	0	0
T34	825416	4407	0	0
T35	618686	647	0	0
T36	809098	3525	0	0
T46	0	1830	0	0
T47	0	461	0	0
T49	0	111	0	0
T57	0	2692	0	0
T59	0	1131	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1159	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	740	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1696	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1437594	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1741	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1437594	0	0
T22	56541	0	0	0
T34	825416	4407	0	0
T35	618686	700	0	0
T36	809098	3525	0	0
T46	0	1810	0	0
T47	0	444	0	0
T49	0	109	0	0
T57	0	2678	0	0
T59	0	1252	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1115	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	738	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1741	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1440337	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1717	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1440337	0	0
T22	56541	0	0	0
T34	825416	4407	0	0
T35	618686	717	0	0
T36	809098	3525	0	0
T46	0	1790	0	0
T47	0	425	0	0
T49	0	107	0	0
T57	0	2664	0	0
T59	0	1221	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1060	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	736	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1717	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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 T15 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T15 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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 T15 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T15 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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 T15 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T15 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T15,T17
1	1	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T15,T17
1	1	Covered	T1,T15,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T1,T15,T17
0	0	1	Covered	T1,T15,T17
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1429438	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1680	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1429438	0	0
T1	249622	1402	0	0
T2	160572	0	0	0
T3	117341	949	0	0
T9	0	334	0	0
T10	0	391	0	0
T12	0	1897	0	0
T14	53100	0	0	0
T15	217292	1463	0	0
T16	251188	0	0	0
T17	54679	447	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T60	0	705	0	0
T61	0	1886	0	0
T62	0	305	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1680	0	0
T1	249622	1	0	0
T2	160572	0	0	0
T3	117341	1	0	0
T9	0	1	0	0
T10	0	1	0	0
T12	0	1	0	0
T14	53100	0	0	0
T15	217292	1	0	0
T16	251188	0	0	0
T17	54679	1	0	0
T18	219434	0	0	0
T19	259324	0	0	0
T20	138841	0	0	0
T60	0	1	0	0
T61	0	1	0	0
T62	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1410380	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1709	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1410380	0	0
T22	56541	0	0	0
T34	825416	4389	0	0
T35	618686	714	0	0
T36	809098	3507	0	0
T46	0	1750	0	0
T47	0	409	0	0
T49	0	103	0	0
T57	0	2636	0	0
T59	0	1104	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1152	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	732	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1709	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1382613	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1656	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1382613	0	0
T22	56541	0	0	0
T34	825416	4389	0	0
T35	618686	701	0	0
T36	809098	3507	0	0
T46	0	1730	0	0
T47	0	398	0	0
T49	0	101	0	0
T57	0	2622	0	0
T59	0	1310	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1102	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	730	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1656	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T34 T35 T36 
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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T34 T35 T36 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T34 T35 T36 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T34 T35 T36 
135        1/1                txn_bits_q <= '0;
           Tests:       T34 T35 T36 
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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T34,T35,T36
1	1	Covered	T34,T35,T36

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T34,T35,T36
0	0	1	Covered	T34,T35,T36
0	0	0	Covered	T4,T5,T6

---

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	1026056372	1406923	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	1684	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1406923	0	0
T22	56541	0	0	0
T34	825416	4389	0	0
T35	618686	736	0	0
T36	809098	3507	0	0
T46	0	1710	0	0
T47	0	516	0	0
T49	0	99	0	0
T57	0	2608	0	0
T59	0	1202	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1049	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	728	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1684	0	0
T22	56541	0	0	0
T34	825416	9	0	0
T35	618686	9	0	0
T36	809098	9	0	0
T46	0	10	0	0
T47	0	1	0	0
T49	0	1	0	0
T57	0	7	0	0
T59	0	4	0	0
T71	192078	0	0	0
T72	68279	0	0	0
T96	0	1	0	0
T99	55110	0	0	0
T100	120764	0	0	0
T101	33018	0	0	0
T102	103850	0	0	0
T103	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	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:       T11 T21 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:       T4 T5 T6 
72         1/1                src_busy_q <= '0;
           Tests:       T4 T5 T6 
73         1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T11 T21 T28 
75         1/1              end else if (src_ack) begin
           Tests:       T4 T5 T6 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T11 T21 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:       T4 T5 T6 
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:       T4 T5 T6 
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:       T4 T5 T6 
116        1/1                src_q <= ResetVal;
           Tests:       T4 T5 T6 
117        1/1                txn_bits_q <= '0;
           Tests:       T4 T5 T6 
118        1/1              end else if (src_req) begin
           Tests:       T4 T5 T6 
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:       T11 T21 T28 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T11 T21 T28 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T4 T5 T6 
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:       T11 T21 T28 
135        1/1                txn_bits_q <= '0;
           Tests:       T11 T21 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:       T4 T5 T6 
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:       T4 T5 T6 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T4 T5 T6 
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:       T4 T5 T6 

---

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	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T11,T21,T28
1	1	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	-	Covered	T11,T21,T34
1	-	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Unreachable
1	0	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T11,T21,T28
1	1	Covered	T11,T21,T28

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

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
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	T4,T5,T6
0	1	-	Covered	T11,T21,T28
0	0	1	Covered	T11,T21,T28
0	0	0	Covered	T4,T5,T6

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	T4,T5,T6
0	1	-	Covered	T11,T21,T28
0	0	1	Covered	T11,T21,T28
0	0	0	Covered	T4,T5,T6

---

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	1026056372	799101	0	0
DstReqKnown_A	8548505	7895681	0	0
SrcAckBusyChk_A	1026056372	933	0	0
SrcBusyKnown_A	1026056372	1025642027	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	799101	0	0
T11	47466	594	0	0
T12	242367	0	0	0
T21	0	3477	0	0
T22	0	1576	0	0
T27	203927	0	0	0
T28	0	698	0	0
T34	0	1671	0	0
T36	0	1431	0	0
T60	108358	0	0	0
T73	0	2829	0	0
T74	0	956	0	0
T75	0	3311	0	0
T76	0	1408	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	8548505	7895681	0	0
T1	509	109	0	0
T2	655	255	0	0
T4	497	97	0	0
T5	415	15	0	0
T6	423	23	0	0
T14	424	24	0	0
T15	443	43	0	0
T16	501	101	0	0
T17	475	75	0	0
T23	756	8	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	933	0	0
T11	47466	2	0	0
T12	242367	0	0	0
T21	0	2	0	0
T22	0	4	0	0
T27	203927	0	0	0
T28	0	1	0	0
T34	0	4	0	0
T36	0	4	0	0
T60	108358	0	0	0
T73	0	2	0	0
T74	0	2	0	0
T75	0	2	0	0
T76	0	2	0	0
T78	210972	0	0	0
T79	92821	0	0	0
T80	54383	0	0	0
T81	74344	0	0	0
T82	282680	0	0	0
T83	306471	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1026056372	1025642027	0	0
T1	249622	249562	0	0
T2	160572	160489	0	0
T4	124346	124248	0	0
T5	66507	66456	0	0
T6	101582	101520	0	0
T14	53100	53002	0	0
T15	217292	217232	0	0
T16	251188	251104	0	0
T17	54679	54623	0	0
T23	90850	89871	0	0