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_09_03/sysrst_ctrl-sim-vcs/default/sim-vcs/../src/lowrisc_prim_subreg_0/rtl/prim_reg_cdc.sv

Module self-instances :

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

---

Module Instance : tb.dut.u_reg.u_wkup_status_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_ec_rst_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_key_invert_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_pin_allowed_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_pin_out_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_pin_out_value_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_key_intr_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_key_intr_debounce_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_auto_block_debounce_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_auto_block_out_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_pre_det_ctl_0_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_pre_det_ctl_1_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_pre_det_ctl_2_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_pre_det_ctl_3_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_sel_ctl_0_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_sel_ctl_1_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

---

Module Instance : tb.dut.u_reg.u_ulp_ctl_cdc

Instance :

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

Instance's subtree :

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

Parent :

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

Subtrees :

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

Line Coverage for Module : prim_reg_cdc

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

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

---

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

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_ec_rst_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_ulp_ac_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_ulp_lid_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_ulp_pwrb_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_pin_allowed_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_key_intr_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_key_invert_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_pin_out_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_pin_out_value_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_key_intr_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_auto_block_debounce_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_auto_block_out_ctl_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_sel_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_sel_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_sel_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_sel_ctl_3_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_sel_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_sel_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_sel_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_sel_ctl_3_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_det_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_det_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_det_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_pre_det_ctl_3_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_det_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_det_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_det_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_det_ctl_3_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_out_ctl_0_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_out_ctl_1_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_out_ctl_2_cdc

SCORE	COND
97.73	90.91

tb.dut.u_reg.u_com_out_ctl_3_cdc

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

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

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

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

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

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

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

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

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

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

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

---

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

SCORE	COND
98.08	92.31

tb.dut.u_reg.u_ulp_ctl_cdc

SCORE	COND
96.88	87.50

tb.dut.u_reg.u_wkup_status_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	-	Covered	T2,T10,T17
1	-	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Covered	T1,T2,T3
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

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

---

Branch Coverage for Module : prim_reg_cdc

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

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

Branches:

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

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

Branches:

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

---

Assert Coverage for Module : prim_reg_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	2147483647	98010616	0	0
DstReqKnown_A	207191954	185746352	0	0
SrcAckBusyChk_A	2147483647	107184	0	0
SrcBusyKnown_A	2147483647	2147483647	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	98010616	0	0
T1	41595	329	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	310	0	0
T7	20487	152	0	0
T8	116340	466	0	0
T9	0	496	0	0
T12	0	972	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	360711	4312	0	0
T17	0	338	0	0
T22	99336	0	0	0
T24	101690	0	0	0
T25	477102	0	0	0
T26	376406	2649	0	0
T27	290112	5393	0	0
T28	0	1905	0	0
T32	303147	141	0	0
T57	0	1916	0	0
T58	0	9801	0	0
T59	0	1959	0	0
T60	0	5394	0	0
T61	0	5395	0	0
T62	0	698	0	0
T63	0	8488	0	0
T64	0	5028	0	0
T65	0	11632	0	0
T66	85332	0	0	0
T67	210020	0	0	0
T68	182624	0	0	0
T69	60619	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	207191954	185746352	0	0
T1	16626	3026	0	0
T2	47124	33524	0	0
T3	37128	23528	0	0
T4	14314	714	0	0
T5	16014	2414	0	0
T7	17374	3774	0	0
T13	14348	748	0	0
T14	16898	3298	0	0
T15	17782	4182	0	0
T16	22712	9112	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	107184	0	0
T1	41595	1	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	1	0	0
T7	20487	1	0	0
T8	116340	1	0	0
T9	0	1	0	0
T12	0	1	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	360711	6	0	0
T17	0	1	0	0
T22	99336	0	0	0
T24	101690	0	0	0
T25	477102	0	0	0
T26	376406	6	0	0
T27	290112	7	0	0
T28	0	1	0	0
T32	303147	0	0	0
T57	0	1	0	0
T58	0	8	0	0
T59	0	1	0	0
T60	0	7	0	0
T61	0	7	0	0
T62	0	1	0	0
T63	0	6	0	0
T64	0	7	0	0
T65	0	6	0	0
T66	85332	0	0	0
T67	210020	0	0	0
T68	182624	0	0	0
T69	60619	0	0	0
T70	0	3	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	2147483647	2147483647	0	0
T1	1414230	1412054	0	0
T2	1334126	1330896	0	0
T3	2786878	2783716	0	0
T4	1645872	1643084	0	0
T5	1844602	1841848	0	0
T7	696558	694008	0	0
T13	6898668	6895914	0	0
T14	5911172	5908554	0	0
T15	4094246	4092512	0	0
T16	4088058	4086154	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:       T2 T10 T17 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T2 T10 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T2 T10 T17 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T2 T10 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T2 T10 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T2 T3 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T2 T3 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	-	Covered	T52,T71,T35
1	-	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Covered	T1,T2,T3
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T1,T2,T3
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	968283	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1092	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	968283	0	0
T2	39239	235	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	3785	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	328	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T33	0	1376	0	0
T66	42666	0	0	0
T72	0	746	0	0
T73	0	132	0	0
T74	0	824	0	0
T75	0	158	0	0
T76	0	352	0	0
T77	0	1447	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1092	0	0
T2	39239	1	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	2	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	1	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T33	0	6	0	0
T66	42666	0	0	0
T72	0	2	0	0
T73	0	1	0	0
T74	0	2	0	0
T75	0	1	0	0
T76	0	1	0	0
T77	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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 T5 T7 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T5 T7 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T5 T7 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T5 T7 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T5 T7 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T5 T7 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T5 T7 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

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

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

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

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

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

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T5,T7
1	1	Covered	T1,T5,T7

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

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

---

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

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

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

Branches:

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

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

Branches:

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

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1701521	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1867	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1701521	0	0
T1	41595	316	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	276	0	0
T7	20487	148	0	0
T8	0	452	0	0
T9	0	492	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T28	0	1874	0	0
T57	0	1912	0	0
T78	0	1907	0	0
T79	0	282	0	0
T80	0	1477	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1867	0	0
T1	41595	1	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	1	0	0
T7	20487	1	0	0
T8	0	1	0	0
T9	0	1	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T28	0	1	0	0
T57	0	1	0	0
T78	0	1	0	0
T79	0	1	0	0
T80	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T2 T10 T17 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T2 T10 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T2 T10 T17 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T2 T10 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T2 T10 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T2 T10 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T2 T10 T17 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	996412	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	995	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	996412	0	0
T2	39239	571	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	3795	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	344	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T72	0	809	0	0
T73	0	384	0	0
T74	0	833	0	0
T75	0	182	0	0
T76	0	357	0	0
T77	0	1452	0	0
T81	0	4733	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	995	0	0
T2	39239	2	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	2	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	1	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T72	0	2	0	0
T73	0	3	0	0
T74	0	2	0	0
T75	0	1	0	0
T76	0	1	0	0
T77	0	1	0	0
T81	0	3	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T2 T10 T17 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T2 T10 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T2 T10 T17 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T2 T10 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T2 T10 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T2 T10 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T2 T10 T17 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	962623	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	980	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	962623	0	0
T2	39239	554	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	3791	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	333	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T72	0	787	0	0
T73	0	378	0	0
T74	0	829	0	0
T75	0	176	0	0
T76	0	355	0	0
T77	0	1450	0	0
T81	0	4714	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	980	0	0
T2	39239	2	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	2	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	1	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T72	0	2	0	0
T73	0	3	0	0
T74	0	2	0	0
T75	0	1	0	0
T76	0	1	0	0
T77	0	1	0	0
T81	0	3	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T2 T10 T17 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T2 T10 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T2 T10 T17 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T2 T10 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T2 T10 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T2 T10 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T2 T10 T17 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	970682	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	981	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	970682	0	0
T2	39239	547	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	3787	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	321	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T72	0	777	0	0
T73	0	372	0	0
T74	0	825	0	0
T75	0	165	0	0
T76	0	353	0	0
T77	0	1448	0	0
T81	0	4693	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	981	0	0
T2	39239	2	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	2	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	1	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T72	0	2	0	0
T73	0	3	0	0
T74	0	2	0	0
T75	0	1	0	0
T76	0	1	0	0
T77	0	1	0	0
T81	0	3	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T14 T22 T23 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T14 T22 T23 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T14 T22 T23 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T14 T22 T23 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T14 T22 T23 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T14 T22 T23 
135        1/1                txn_bits_q <= '0;
           Tests:       T14 T22 T23 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T14,T22,T23

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T14,T22,T23
1	1	Covered	T14,T22,T23

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T14,T22,T23

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T14,T22,T23
1	1	Covered	T14,T22,T23

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T14,T22,T23
0	0	1	Covered	T14,T22,T23
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T14,T22,T23
0	0	1	Covered	T14,T22,T23
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	2262740	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	2310	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	2262740	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T8	58170	0	0	0
T14	173858	25808	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T22	0	6693	0	0
T23	0	5103	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T82	0	8526	0	0
T83	0	8168	0	0
T84	0	17143	0	0
T85	0	33376	0	0
T86	0	15841	0	0
T87	0	18146	0	0
T88	0	2458	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	2310	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T8	58170	0	0	0
T14	173858	20	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T22	0	20	0	0
T23	0	20	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T82	0	20	0	0
T83	0	20	0	0
T84	0	20	0	0
T85	0	20	0	0
T86	0	20	0	0
T87	0	20	0	0
T88	0	20	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T14 T15 T24 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T14 T15 T24 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T14 T15 T24 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T14 T15 T24 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T14 T15 T24 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T14 T15 T24 
135        1/1                txn_bits_q <= '0;
           Tests:       T14 T15 T24 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T14,T15,T24

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T14,T15,T24
1	1	Covered	T14,T15,T24

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T14,T15,T24

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T14,T15,T24
1	1	Covered	T14,T15,T24

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T14,T15,T24
0	0	1	Covered	T14,T15,T24
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T14,T15,T24
0	0	1	Covered	T14,T15,T24
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	3574111	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	3777	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	3574111	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T8	58170	0	0	0
T9	0	8679	0	0
T14	173858	1033	0	0
T15	120419	16950	0	0
T16	120237	0	0	0
T22	0	285	0	0
T23	0	222	0	0
T24	50845	6828	0	0
T25	238551	32702	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T89	0	34193	0	0
T90	0	8931	0	0
T91	0	15632	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	3777	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T8	58170	0	0	0
T9	0	20	0	0
T14	173858	1	0	0
T15	120419	20	0	0
T16	120237	0	0	0
T22	0	1	0	0
T23	0	1	0	0
T24	50845	20	0	0
T25	238551	20	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T89	0	20	0	0
T90	0	20	0	0
T91	0	40	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	0	0

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

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

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

---

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

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

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

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

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

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

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

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

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T5,T14
1	1	Covered	T1,T5,T14

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

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

---

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

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

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

Branches:

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

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

Branches:

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

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	4470577	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	4742	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	4470577	0	0
T1	41595	340	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	324	0	0
T7	20487	156	0	0
T8	0	477	0	0
T13	202902	0	0	0
T14	173858	1045	0	0
T15	120419	17030	0	0
T16	120237	0	0	0
T22	0	299	0	0
T24	0	6908	0	0
T25	0	32782	0	0
T78	0	1917	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	4742	0	0
T1	41595	1	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	1	0	0
T7	20487	1	0	0
T8	0	1	0	0
T13	202902	0	0	0
T14	173858	1	0	0
T15	120419	20	0	0
T16	120237	0	0	0
T22	0	1	0	0
T24	0	20	0	0
T25	0	20	0	0
T78	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T15 T24 T25 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T15 T24 T25 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T15 T24 T25 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T15 T24 T25 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T15 T24 T25 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T15 T24 T25 
135        1/1                txn_bits_q <= '0;
           Tests:       T15 T24 T25 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T15,T24,T25

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T15,T24,T25
1	1	Covered	T15,T24,T25

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T15,T24,T25

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T15,T24,T25
1	1	Covered	T15,T24,T25

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T15,T24,T25
0	0	1	Covered	T15,T24,T25
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T15,T24,T25
0	0	1	Covered	T15,T24,T25
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	3508671	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	3663	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	3508671	0	0
T7	20487	0	0	0
T8	58170	0	0	0
T9	0	8719	0	0
T15	120419	16990	0	0
T16	120237	0	0	0
T22	49668	0	0	0
T24	50845	6868	0	0
T25	238551	32742	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T67	105010	0	0	0
T89	0	34309	0	0
T90	0	8971	0	0
T91	0	16050	0	0
T92	0	32918	0	0
T93	0	35264	0	0
T94	0	16840	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	3663	0	0
T7	20487	0	0	0
T8	58170	0	0	0
T9	0	20	0	0
T15	120419	20	0	0
T16	120237	0	0	0
T22	49668	0	0	0
T24	50845	20	0	0
T25	238551	20	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T67	105010	0	0	0
T89	0	20	0	0
T90	0	20	0	0
T91	0	40	0	0
T92	0	20	0	0
T93	0	20	0	0
T94	0	20	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	0	0

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

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

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T3 T6 T11 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T3 T6 T11 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T3 T6 T11 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T3 T6 T11 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T3 T6 T11 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T3 T6 T11 
135        1/1                txn_bits_q <= '0;
           Tests:       T3 T6 T11 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T3,T6,T11

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T3,T6,T11

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T3,T6,T11
1	1	Covered	T3,T6,T11

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T3,T6,T11
0	0	1	Covered	T3,T6,T11
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T3,T6,T11
0	0	1	Covered	T3,T6,T11
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1078534	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1041	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1078534	0	0
T3	81967	222	0	0
T6	0	1274	0	0
T7	20487	0	0	0
T8	58170	0	0	0
T11	0	1371	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T22	49668	0	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T43	0	473	0	0
T44	0	1912	0	0
T45	0	356	0	0
T46	0	715	0	0
T48	0	459	0	0
T49	0	1248	0	0
T50	0	249	0	0
T66	42666	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1041	0	0
T3	81967	1	0	0
T6	0	1	0	0
T7	20487	0	0	0
T8	58170	0	0	0
T11	0	1	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T22	49668	0	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T43	0	1	0	0
T44	0	1	0	0
T45	0	1	0	0
T46	0	1	0	0
T48	0	1	0	0
T49	0	1	0	0
T50	0	1	0	0
T66	42666	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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 T5 T3 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T5 T3 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T5 T3 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T5 T3 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T5 T3 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T5 T3 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T5 T3 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

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

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

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

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

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

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

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

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

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

---

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

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

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

Branches:

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

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

Branches:

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

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1737256	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1896	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1737256	0	0
T1	41595	311	0	0
T2	39239	0	0	0
T3	81967	211	0	0
T4	48408	0	0	0
T5	54253	264	0	0
T6	0	1271	0	0
T7	20487	146	0	0
T8	0	443	0	0
T9	0	490	0	0
T11	0	1362	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T28	0	1864	0	0
T57	0	1910	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1896	0	0
T1	41595	1	0	0
T2	39239	0	0	0
T3	81967	1	0	0
T4	48408	0	0	0
T5	54253	1	0	0
T6	0	1	0	0
T7	20487	1	0	0
T8	0	1	0	0
T9	0	1	0	0
T11	0	1	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T28	0	1	0	0
T57	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	0	0

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

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

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T16 T26 T27 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T16 T26 T27 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T16 T26 T27 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T16 T26 T27 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T16 T26 T27 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T16 T26 T27 
135        1/1                txn_bits_q <= '0;
           Tests:       T16 T26 T27 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T16,T26,T27

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T16,T26,T27
1	1	Covered	T16,T26,T27

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T16,T26,T27

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T16,T26,T27
1	1	Covered	T16,T26,T27

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T16,T26,T27
0	0	1	Covered	T16,T26,T27
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T16,T26,T27
0	0	1	Covered	T16,T26,T27
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1174909	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1196	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1174909	0	0
T8	58170	0	0	0
T16	120237	2159	0	0
T22	49668	0	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	1342	0	0
T27	145056	2999	0	0
T58	0	6096	0	0
T60	0	3052	0	0
T61	0	3053	0	0
T62	0	540	0	0
T63	0	4247	0	0
T64	0	2877	0	0
T65	0	5819	0	0
T66	42666	0	0	0
T67	105010	0	0	0
T68	91312	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1196	0	0
T8	58170	0	0	0
T16	120237	3	0	0
T22	49668	0	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	3	0	0
T27	145056	4	0	0
T58	0	5	0	0
T60	0	4	0	0
T61	0	4	0	0
T62	0	1	0	0
T63	0	3	0	0
T64	0	4	0	0
T65	0	3	0	0
T66	42666	0	0	0
T67	105010	0	0	0
T68	91312	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	0	0

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

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

64                      
65         1/1            assign src_req = src_we_i | src_re_i;
           Tests:       T16 T26 T27 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T16 T26 T27 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T16 T26 T27 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T16 T26 T27 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T16 T26 T27 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T16 T26 T27 
135        1/1                txn_bits_q <= '0;
           Tests:       T16 T26 T27 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T16,T26,T27

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T16,T26,T27
1	1	Covered	T16,T26,T27

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T16,T26,T27

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T16,T26,T27
1	1	Covered	T16,T26,T27

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T16,T26,T27
0	0	1	Covered	T16,T26,T27
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T16,T26,T27
0	0	1	Covered	T16,T26,T27
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1126360	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1120	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1126360	0	0
T8	58170	0	0	0
T16	120237	2153	0	0
T22	49668	0	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	1307	0	0
T27	145056	2394	0	0
T58	0	3705	0	0
T60	0	2342	0	0
T61	0	2342	0	0
T62	0	158	0	0
T63	0	4241	0	0
T64	0	2151	0	0
T65	0	5813	0	0
T66	42666	0	0	0
T67	105010	0	0	0
T68	91312	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1120	0	0
T8	58170	0	0	0
T16	120237	3	0	0
T22	49668	0	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	3	0	0
T27	145056	3	0	0
T58	0	3	0	0
T60	0	3	0	0
T61	0	3	0	0
T63	0	3	0	0
T64	0	3	0	0
T65	0	3	0	0
T66	42666	0	0	0
T67	105010	0	0	0
T68	91312	0	0	0
T70	0	3	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T5 T7 T28 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T5 T7 T28 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T5 T7 T28 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T5 T7 T28 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T5 T7 T28 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T5 T7 T28 
135        1/1                txn_bits_q <= '0;
           Tests:       T5 T7 T28 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T5,T7,T28

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T5,T7,T28
1	1	Covered	T5,T7,T28

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T5,T7,T28

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T5,T7,T28
1	1	Covered	T5,T7,T28

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T5,T7,T28
0	0	1	Covered	T5,T7,T28
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T5,T7,T28
0	0	1	Covered	T5,T7,T28
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	6547759	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	7348	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	6547759	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T5	54253	343	0	0
T7	20487	160	0	0
T12	0	980	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T24	50845	0	0	0
T26	188203	0	0	0
T28	0	1953	0	0
T29	0	21716	0	0
T30	0	25827	0	0
T31	0	9591	0	0
T41	0	29825	0	0
T52	0	16451	0	0
T69	0	477	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7348	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T5	54253	1	0	0
T7	20487	1	0	0
T12	0	1	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T24	50845	0	0	0
T26	188203	0	0	0
T28	0	1	0	0
T29	0	51	0	0
T30	0	63	0	0
T31	0	72	0	0
T41	0	70	0	0
T52	0	11	0	0
T69	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T29 T30 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:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T29 T30 T31 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T29 T30 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:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T29 T30 T31 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T29 T30 T31 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T29 T30 T31 
135        1/1                txn_bits_q <= '0;
           Tests:       T29 T30 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:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	6601707	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	7399	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	6601707	0	0
T29	152744	20752	0	0
T30	0	25569	0	0
T31	0	10654	0	0
T41	0	31229	0	0
T52	0	16445	0	0
T56	0	30024	0	0
T71	0	17967	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	34621	0	0
T96	0	5730	0	0
T97	0	29429	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7399	0	0
T29	152744	51	0	0
T30	0	63	0	0
T31	0	82	0	0
T41	0	74	0	0
T52	0	11	0	0
T56	0	80	0	0
T71	0	11	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	51	0	0
T96	0	59	0	0
T97	0	69	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T29 T30 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:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T29 T30 T31 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T29 T30 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:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T29 T30 T31 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T29 T30 T31 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T29 T30 T31 
135        1/1                txn_bits_q <= '0;
           Tests:       T29 T30 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:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	6505265	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	7354	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	6505265	0	0
T29	152744	19839	0	0
T30	0	20479	0	0
T31	0	6460	0	0
T41	0	30959	0	0
T52	0	16445	0	0
T56	0	25240	0	0
T71	0	17950	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	34411	0	0
T96	0	5599	0	0
T97	0	29123	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7354	0	0
T29	152744	51	0	0
T30	0	51	0	0
T31	0	51	0	0
T41	0	74	0	0
T52	0	11	0	0
T56	0	67	0	0
T71	0	11	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	51	0	0
T96	0	59	0	0
T97	0	69	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T29 T30 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:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T29 T30 T31 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T29 T30 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:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T29 T30 T31 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T29 T30 T31 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T29 T30 T31 
135        1/1                txn_bits_q <= '0;
           Tests:       T29 T30 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:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	6273991	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	7231	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	6273991	0	0
T29	152744	19068	0	0
T30	0	25101	0	0
T31	0	10110	0	0
T41	0	24242	0	0
T52	0	16445	0	0
T56	0	23212	0	0
T71	0	17946	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	34201	0	0
T96	0	5609	0	0
T97	0	23133	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7231	0	0
T29	152744	51	0	0
T30	0	63	0	0
T31	0	82	0	0
T41	0	58	0	0
T52	0	11	0	0
T56	0	63	0	0
T71	0	11	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	51	0	0
T96	0	59	0	0
T97	0	55	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T5 T7 T28 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T5 T7 T28 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T5 T7 T28 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T5 T7 T28 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T5 T7 T28 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T5 T7 T28 
135        1/1                txn_bits_q <= '0;
           Tests:       T5 T7 T28 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T5,T7,T28

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T5,T7,T28
1	1	Covered	T5,T7,T28

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T5,T7,T28

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T5,T7,T28
1	1	Covered	T5,T7,T28

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T5,T7,T28
0	0	1	Covered	T5,T7,T28
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T5,T7,T28
0	0	1	Covered	T5,T7,T28
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1270130	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1304	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1270130	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T5	54253	335	0	0
T7	20487	158	0	0
T12	0	978	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T24	50845	0	0	0
T26	188203	0	0	0
T28	0	1937	0	0
T29	0	479	0	0
T30	0	459	0	0
T31	0	118	0	0
T41	0	1195	0	0
T52	0	13763	0	0
T69	0	475	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1304	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T5	54253	1	0	0
T7	20487	1	0	0
T12	0	1	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T24	50845	0	0	0
T26	188203	0	0	0
T28	0	1	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T41	0	3	0	0
T52	0	9	0	0
T69	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T29 T30 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:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T29 T30 T31 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T29 T30 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:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T29 T30 T31 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T29 T30 T31 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T29 T30 T31 
135        1/1                txn_bits_q <= '0;
           Tests:       T29 T30 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:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1235031	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1264	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1235031	0	0
T29	152744	440	0	0
T30	0	449	0	0
T31	0	108	0	0
T41	0	1165	0	0
T52	0	13757	0	0
T56	0	747	0	0
T71	0	14949	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	573	0	0
T96	0	218	0	0
T97	0	2445	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1264	0	0
T29	152744	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T41	0	3	0	0
T52	0	9	0	0
T56	0	2	0	0
T71	0	9	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	1	0	0
T96	0	3	0	0
T97	0	5	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T29 T30 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:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T29 T30 T31 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T29 T30 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:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T29 T30 T31 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T29 T30 T31 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T29 T30 T31 
135        1/1                txn_bits_q <= '0;
           Tests:       T29 T30 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:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1227969	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1265	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1227969	0	0
T29	152744	407	0	0
T30	0	439	0	0
T31	0	98	0	0
T41	0	1135	0	0
T52	0	13757	0	0
T56	0	727	0	0
T71	0	14950	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	563	0	0
T96	0	238	0	0
T97	0	2395	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1265	0	0
T29	152744	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T41	0	3	0	0
T52	0	9	0	0
T56	0	2	0	0
T71	0	9	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	1	0	0
T96	0	3	0	0
T97	0	5	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T29 T30 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:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T29 T30 T31 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T29 T30 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:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T29 T30 T31 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T29 T30 T31 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T29 T30 T31 
135        1/1                txn_bits_q <= '0;
           Tests:       T29 T30 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:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T29,T30,T31

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T29,T30,T31
1	1	Covered	T29,T30,T31

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T29,T30,T31
0	0	1	Covered	T29,T30,T31
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1226889	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1307	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1226889	0	0
T29	152744	477	0	0
T30	0	429	0	0
T31	0	88	0	0
T41	0	1105	0	0
T52	0	13757	0	0
T56	0	707	0	0
T71	0	14927	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	553	0	0
T96	0	239	0	0
T97	0	2345	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1307	0	0
T29	152744	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T41	0	3	0	0
T52	0	9	0	0
T56	0	2	0	0
T71	0	9	0	0
T75	116830	0	0	0
T86	338985	0	0	0
T87	124086	0	0	0
T88	17914	0	0	0
T95	0	1	0	0
T96	0	3	0	0
T97	0	5	0	0
T98	125736	0	0	0
T99	63093	0	0	0
T100	109005	0	0	0
T101	50849	0	0	0
T102	201180	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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 T5 T7 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T5 T7 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T5 T7 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T5 T7 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T5 T7 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T5 T7 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T5 T7 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

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

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

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

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

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

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T5,T7
1	1	Covered	T1,T5,T7

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

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

---

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

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

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

Branches:

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

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

Branches:

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

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	7030071	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	7859	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7030071	0	0
T1	41595	331	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	320	0	0
T7	20487	154	0	0
T8	0	475	0	0
T9	0	498	0	0
T12	0	974	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	342	0	0
T28	0	1913	0	0
T57	0	1918	0	0
T59	0	1970	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7859	0	0
T1	41595	1	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	1	0	0
T7	20487	1	0	0
T8	0	1	0	0
T9	0	1	0	0
T12	0	1	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	1	0	0
T28	0	1	0	0
T57	0	1	0	0
T59	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	7174947	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	7976	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7174947	0	0
T29	0	21167	0	0
T30	0	25689	0	0
T31	0	10812	0	0
T32	303147	145	0	0
T33	0	1667	0	0
T40	0	2092	0	0
T41	0	31359	0	0
T42	0	2016	0	0
T55	0	745	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	373	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7976	0	0
T29	0	51	0	0
T30	0	63	0	0
T31	0	82	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	74	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_2_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	7016437	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	7884	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7016437	0	0
T29	0	20262	0	0
T30	0	20575	0	0
T31	0	6556	0	0
T32	303147	131	0	0
T33	0	1598	0	0
T40	0	2030	0	0
T41	0	31089	0	0
T42	0	1986	0	0
T55	0	739	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	371	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7884	0	0
T29	0	51	0	0
T30	0	51	0	0
T31	0	51	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	74	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_sel_ctl_3_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	6746619	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	7755	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	6746619	0	0
T29	0	19483	0	0
T30	0	25221	0	0
T31	0	10268	0	0
T32	303147	125	0	0
T33	0	1531	0	0
T40	0	1981	0	0
T41	0	24340	0	0
T42	0	1956	0	0
T55	0	733	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	369	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	7755	0	0
T29	0	51	0	0
T30	0	63	0	0
T31	0	82	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	58	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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 T5 T7 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T5 T7 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T5 T7 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T5 T7 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T5 T7 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T5 T7 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T5 T7 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

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

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

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

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

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

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

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

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T5,T7
1	1	Covered	T1,T5,T7

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

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

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

Branches:

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

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

Branches:

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

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_0_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1780373	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1870	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1780373	0	0
T1	41595	329	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	310	0	0
T7	20487	152	0	0
T8	0	466	0	0
T9	0	496	0	0
T12	0	972	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	338	0	0
T28	0	1905	0	0
T57	0	1916	0	0
T59	0	1959	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1870	0	0
T1	41595	1	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	1	0	0
T7	20487	1	0	0
T8	0	1	0	0
T9	0	1	0	0
T12	0	1	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	1	0	0
T28	0	1	0	0
T57	0	1	0	0
T59	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_1_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1652950	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1793	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1652950	0	0
T29	0	430	0	0
T30	0	445	0	0
T31	0	104	0	0
T32	303147	141	0	0
T33	0	1417	0	0
T40	0	1881	0	0
T41	0	1153	0	0
T42	0	1896	0	0
T55	0	721	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	365	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1793	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	3	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_2_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1698173	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1809	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1698173	0	0
T29	0	387	0	0
T30	0	435	0	0
T31	0	94	0	0
T32	303147	127	0	0
T33	0	1544	0	0
T40	0	1822	0	0
T41	0	1123	0	0
T42	0	1866	0	0
T55	0	715	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	363	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1809	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	3	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_det_ctl_3_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1657044	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1794	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1657044	0	0
T29	0	463	0	0
T30	0	425	0	0
T31	0	84	0	0
T32	303147	155	0	0
T33	0	1546	0	0
T40	0	1766	0	0
T41	0	1093	0	0
T42	0	1836	0	0
T55	0	709	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	361	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1794	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	3	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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 T5 T7 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T1 T5 T7 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T1 T5 T7 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T1 T5 T7 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T1 T5 T7 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T1 T5 T7 
135        1/1                txn_bits_q <= '0;
           Tests:       T1 T5 T7 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

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

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

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

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

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

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

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

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T1,T5,T7
1	1	Covered	T1,T5,T7

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

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

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

Branches:

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

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

Branches:

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

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_0_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1729950	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1843	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1729950	0	0
T1	41595	319	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	293	0	0
T7	20487	150	0	0
T8	0	454	0	0
T9	0	494	0	0
T12	0	970	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	330	0	0
T28	0	1885	0	0
T57	0	1914	0	0
T59	0	1957	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1843	0	0
T1	41595	1	0	0
T2	39239	0	0	0
T3	81967	0	0	0
T4	48408	0	0	0
T5	54253	1	0	0
T7	20487	1	0	0
T8	0	1	0	0
T9	0	1	0	0
T12	0	1	0	0
T13	202902	0	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	1	0	0
T28	0	1	0	0
T57	0	1	0	0
T59	0	1	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_1_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1705666	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1822	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1705666	0	0
T29	0	423	0	0
T30	0	443	0	0
T31	0	102	0	0
T32	303147	136	0	0
T33	0	1598	0	0
T40	0	1677	0	0
T41	0	1147	0	0
T42	0	1776	0	0
T55	0	697	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	357	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1822	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	3	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_2_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1680101	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1807	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1680101	0	0
T29	0	379	0	0
T30	0	433	0	0
T31	0	92	0	0
T32	303147	160	0	0
T33	0	1527	0	0
T40	0	1644	0	0
T41	0	1117	0	0
T42	0	1746	0	0
T55	0	691	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	355	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1807	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	3	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T32 T33 T29 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T32 T33 T29 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T32 T33 T29 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T32 T33 T29 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T32 T33 T29 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T32 T33 T29 
135        1/1                txn_bits_q <= '0;
           Tests:       T32 T33 T29 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

Cond Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

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

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T32,T33,T29

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T32,T33,T29
1	1	Covered	T32,T33,T29

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

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

---

Branch Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T32,T33,T29
0	0	1	Covered	T32,T33,T29
0	0	0	Covered	T1,T4,T5

---

Assert Coverage for Instance : tb.dut.u_reg.u_com_out_ctl_3_cdc

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1714012	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	1847	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1714012	0	0
T29	0	458	0	0
T30	0	423	0	0
T31	0	82	0	0
T32	303147	156	0	0
T33	0	1468	0	0
T40	0	1697	0	0
T41	0	1087	0	0
T42	0	1716	0	0
T55	0	685	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	353	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1847	0	0
T29	0	1	0	0
T30	0	1	0	0
T31	0	1	0	0
T32	303147	1	0	0
T33	0	7	0	0
T40	0	7	0	0
T41	0	3	0	0
T42	0	15	0	0
T55	0	3	0	0
T69	60619	0	0	0
T72	61466	0	0	0
T83	154419	0	0	0
T84	123037	0	0	0
T103	0	1	0	0
T104	50819	0	0	0
T105	33305	0	0	0
T106	210749	0	0	0
T107	65688	0	0	0
T108	195226	0	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	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:       T2 T10 T17 
66                      
67                        // busy indication back-pressures upstream if the register is accessed
68                        // again.  The busy indication is also used as a "commit" indication for
69                        // resolving software and hardware write conflicts
70                        always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
71         1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
72         1/1                src_busy_q <= '0;
           Tests:       T1 T4 T5 
73         1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
74         1/1                src_busy_q <= 1'b1;
           Tests:       T2 T10 T17 
75         1/1              end else if (src_ack) begin
           Tests:       T1 T4 T5 
76         1/1                src_busy_q <= 1'b0;
           Tests:       T2 T10 T17 
77                          end
                        MISSING_ELSE
78                        end
79                      
80                        // A src_ack should only be sent if there was a src_req.
81                        // src_busy_q asserts whenever there is a src_req.  By association,
82                        // whenever src_ack is seen, then src_busy must be high.
83                        `ASSERT(SrcAckBusyChk_A, src_ack |-> src_busy_q, clk_src_i, !rst_src_ni)
84                      
85         1/1            assign src_busy_o = src_busy_q;
           Tests:       T1 T4 T5 
86                      
87                        // src_q acts as both the write holding register and the software read back
88                        // register.
89                        // When software performs a write, the write data is captured in src_q for
90                        // CDC purposes.  When not performing a write, the src_q reflects the most recent
91                        // hardware value. For registers with no hardware access, this is simply the
92                        // the value programmed by software (or in the case R1C, W1C etc) the value after
93                        // the operation. For registers with hardware access, this reflects a potentially
94                        // delayed version of the real value, as the software facing updates lag real
95                        // time updates.
96                        //
97                        // To resolve software and hardware conflicts, the process is as follows:
98                        // When software issues a write, this module asserts "busy".  While busy,
99                        // src_q does not take on destination value updates.  Since the
100                       // logic has committed to updating based on software command, there is an irreversible
101                       // window from which hardware writes are ignored.  Once the busy window completes,
102                       // the cdc portion then begins sampling once more.
103                       //
104                       // This is consistent with prim_subreg_arb where during software / hardware conflicts,
105                       // software is always prioritized.  The main difference is the conflict resolution window
106                       // is now larger instead of just one destination clock cycle.
107                     
108                       logic busy;
109        1/1            assign busy = src_busy_q & !src_ack;
           Tests:       T1 T4 T5 
110                     
111                       // This is the current destination value
112                       logic [DataWidth-1:0] dst_qs;
113                       logic src_update;
114                       always_ff @(posedge clk_src_i or negedge rst_src_ni) begin
115        1/1              if (!rst_src_ni) begin
           Tests:       T1 T4 T5 
116        1/1                src_q <= ResetVal;
           Tests:       T1 T4 T5 
117        1/1                txn_bits_q <= '0;
           Tests:       T1 T4 T5 
118        1/1              end else if (src_req) begin
           Tests:       T1 T4 T5 
119                           // See assertion below
120                           // At the beginning of a software initiated transaction, the following
121                           // values are captured in the src_q/txn_bits_q flops to ensure they cannot
122                           // change for the duration of the synchronization operation.
123        1/1                src_q <= src_wd_i & BitMask;
           Tests:       T2 T10 T17 
124        1/1                txn_bits_q <= {src_we_i, src_re_i, src_regwen_i};
           Tests:       T2 T10 T17 
125        1/1              end else if (src_busy_q && src_ack || src_update && !busy) begin
           Tests:       T1 T4 T5 
126                           // sample data whenever a busy transaction finishes OR
127                           // when an update pulse is seen.
128                           // TODO: We should add a cover group to test different sync timings
129                           // between src_ack and src_update. ie. there can be 3 scenarios:
130                           // 1. update one cycle before ack
131                           // 2. ack one cycle before update
132                           // 3. update / ack on the same cycle
133                           // During all 3 cases the read data should be correct
134        1/1                src_q <= dst_qs;
           Tests:       T2 T10 T17 
135        1/1                txn_bits_q <= '0;
           Tests:       T2 T10 T17 
136                         end
                        MISSING_ELSE
137                       end
138                     
139                       // The current design (tlul_adapter_reg) does not spit out a request if the destination it chooses
140                       // (decoded from address) is busy. So this creates a situation in the current design where
141                       // src_req_i and busy can never be high at the same time.
142                       // While the code above could be coded directly to be expressed as `src_req & !busy`, which makes
143                       // the intent clearer, it ends up causing coverage holes from the tool's perspective since that
144                       // condition cannot be met.
145                       // Thus we add an assertion here to ensure the condition is always satisfied.
146                       `ASSERT(BusySrcReqChk_A, busy |-> !src_req, clk_src_i, !rst_src_ni)
147                     
148                       // reserved bits are not used
149                       logic unused_wd;
150        1/1            assign unused_wd = ^src_wd_i;
           Tests:       T1 T4 T5 
151                     
152                       // src_q is always updated in the clk_src domain.
153                       // when performing an update to the destination domain, it is guaranteed
154                       // to not change by protocol.
155        1/1            assign src_qs_o = src_q;
           Tests:       T1 T4 T5 
156        1/1            assign dst_wd_o = src_q;
           Tests:       T1 T4 T5 
157                     
158                       ////////////////////////////
159                       // CDC handling
160                       ////////////////////////////
161                     
162                       logic dst_req_from_src;
163                       logic dst_req;
164                     
165                     
166                       // the software transaction is pulse synced across the domain.
167                       // the prim_reg_cdc_arb module handles conflicts with ongoing hardware updates.
168                       prim_pulse_sync u_src_to_dst_req (
169                         .clk_src_i,
170                         .rst_src_ni,
171                         .clk_dst_i,
172                         .rst_dst_ni,
173                         .src_pulse_i(src_req),
174                         .dst_pulse_o(dst_req_from_src)
175                       );
176                     
177                       prim_reg_cdc_arb #(
178                         .DataWidth(DataWidth),
179                         .ResetVal(ResetVal),
180                         .DstWrReq(DstWrReq)
181                       ) u_arb (
182                         .clk_src_i,
183                         .rst_src_ni,
184                         .clk_dst_i,
185                         .rst_dst_ni,
186                         .src_ack_o(src_ack),
187                         .src_update_o(src_update),
188                         .dst_req_i(dst_req_from_src),
189                         .dst_req_o(dst_req),
190                         .dst_update_i,
191                         .dst_ds_i,
192                         .dst_qs_i,
193                         .dst_qs_o(dst_qs)
194                       );
195                     
196                     
197                       // Each is valid only when destination request pulse is high; this is important in not propagating
198                       // the internal assertion of 'dst_req' by the 'prim_pulse_sync' channel when just one domain is
199                       // reset.
200        1/1            assign {dst_we_o, dst_re_o, dst_regwen_o} = txn_bits_q & {TxnWidth{dst_req}};
           Tests:       T1 T4 T5 

---

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

	Total	Covered	Percent
Conditions	13	12	92.31
Logical	13	12	92.31
Non-Logical	0	0
Event	0	0

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Covered	T1,T4,T5
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	-	Covered	T2,T10,T17
1	-	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	0	Covered	T1,T4,T5
0	1	Unreachable
1	0	Covered	T2,T10,T17

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

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T2,T10,T17
1	1	Covered	T2,T10,T17

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

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

---

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

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

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

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

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T1,T4,T5
0	1	-	Covered	T2,T10,T17
0	0	1	Covered	T2,T10,T17
0	0	0	Covered	T1,T4,T5

---

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

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

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
BusySrcReqChk_A	1194890855	1002853	0	0
DstReqKnown_A	6093881	5463128	0	0
SrcAckBusyChk_A	1194890855	993	0	0
SrcBusyKnown_A	1194890855	1194468130	0	0

BusySrcReqChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1002853	0	0
T2	39239	574	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	7113	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	813	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T72	0	1481	0	0
T73	0	240	0	0
T74	0	1545	0	0
T75	0	362	0	0
T76	0	713	0	0
T77	0	2903	0	0
T109	0	1537	0	0

DstReqKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	6093881	5463128	0	0
T1	489	89	0	0
T2	1386	986	0	0
T3	1092	692	0	0
T4	421	21	0	0
T5	471	71	0	0
T7	511	111	0	0
T13	422	22	0	0
T14	497	97	0	0
T15	523	123	0	0
T16	668	268	0	0

SrcAckBusyChk_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	993	0	0
T2	39239	2	0	0
T3	81967	0	0	0
T7	20487	0	0	0
T10	0	4	0	0
T14	173858	0	0	0
T15	120419	0	0	0
T16	120237	0	0	0
T17	0	2	0	0
T24	50845	0	0	0
T25	238551	0	0	0
T26	188203	0	0	0
T66	42666	0	0	0
T72	0	4	0	0
T73	0	2	0	0
T74	0	4	0	0
T75	0	2	0	0
T76	0	2	0	0
T77	0	2	0	0
T109	0	2	0	0

SrcBusyKnown_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	1194890855	1194468130	0	0
T1	41595	41531	0	0
T2	39239	39144	0	0
T3	81967	81874	0	0
T4	48408	48326	0	0
T5	54253	54172	0	0
T7	20487	20412	0	0
T13	202902	202821	0	0
T14	173858	173781	0	0
T15	120419	120368	0	0
T16	120237	120181	0	0