Unified Coverage Report :: Module :: prim_reg_cdc_arb

Module : prim_reg_cdc_arb

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
77.29	97.00	75.19			86.96	50.00

Source File(s) :
/workspaces/repo/scratch/os_regression_2024_10_11/clkmgr-sim-vcs/default/sim-vcs/../src/lowrisc_prim_subreg_0/rtl/prim_reg_cdc_arb.sv

Module self-instances :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
tb.dut.u_reg.u_io_meas_ctrl_en_cdc.u_arb	73.61	90.00	76.19			78.26	50.00
tb.dut.u_reg.u_io_div2_meas_ctrl_en_cdc.u_arb	73.61	90.00	76.19			78.26	50.00
tb.dut.u_reg.u_main_meas_ctrl_en_cdc.u_arb	73.61	90.00	76.19			78.26	50.00
tb.dut.u_reg.u_usb_meas_ctrl_en_cdc.u_arb	73.61	90.00	76.19			78.26	50.00
tb.dut.u_reg.u_io_div4_meas_ctrl_en_cdc.u_arb	79.17	94.00	85.71			86.96	50.00
tb.dut.u_reg.u_io_meas_ctrl_shadowed_cdc.u_arb	83.33	100.00	66.67
tb.dut.u_reg.u_io_div2_meas_ctrl_shadowed_cdc.u_arb	83.33	100.00	66.67
tb.dut.u_reg.u_io_div4_meas_ctrl_shadowed_cdc.u_arb	83.33	100.00	66.67
tb.dut.u_reg.u_main_meas_ctrl_shadowed_cdc.u_arb	83.33	100.00	66.67
tb.dut.u_reg.u_usb_meas_ctrl_shadowed_cdc.u_arb	83.33	100.00	66.67

---

Module Instance : tb.dut.u_reg.u_io_meas_ctrl_en_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
73.61	90.00	76.19			78.26	50.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.59	94.90	76.09			88.37	75.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
96.43	100.00	85.71			100.00	100.00	u_io_meas_ctrl_en_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_wr_req.u_dst_update_sync	93.75	100.00	75.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_io_div2_meas_ctrl_en_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
73.61	90.00	76.19			78.26	50.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.59	94.90	76.09			88.37	75.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
96.43	100.00	85.71			100.00	100.00	u_io_div2_meas_ctrl_en_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_wr_req.u_dst_update_sync	93.75	100.00	75.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_main_meas_ctrl_en_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
73.61	90.00	76.19			78.26	50.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.59	94.90	76.09			88.37	75.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
96.43	100.00	85.71			100.00	100.00	u_main_meas_ctrl_en_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_wr_req.u_dst_update_sync	93.75	100.00	75.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_usb_meas_ctrl_en_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
73.61	90.00	76.19			78.26	50.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.59	94.90	76.09			88.37	75.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
96.43	100.00	85.71			100.00	100.00	u_usb_meas_ctrl_en_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_wr_req.u_dst_update_sync	93.75	100.00	75.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_io_div4_meas_ctrl_en_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
79.17	94.00	85.71			86.96	50.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
87.44	96.94	84.78			93.02	75.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
96.43	100.00	85.71			100.00	100.00	u_io_div4_meas_ctrl_en_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_wr_req.u_dst_update_sync	93.75	100.00	75.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_io_meas_ctrl_shadowed_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.33	100.00	66.67

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
97.92	100.00	91.67			100.00	100.00	u_io_meas_ctrl_shadowed_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_passthru.u_dst_to_src_ack	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_io_div2_meas_ctrl_shadowed_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.33	100.00	66.67

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
97.92	100.00	91.67			100.00	100.00	u_io_div2_meas_ctrl_shadowed_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_passthru.u_dst_to_src_ack	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_io_div4_meas_ctrl_shadowed_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.33	100.00	66.67

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
97.92	100.00	91.67			100.00	100.00	u_io_div4_meas_ctrl_shadowed_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_passthru.u_dst_to_src_ack	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_main_meas_ctrl_shadowed_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.33	100.00	66.67

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
97.92	100.00	91.67			100.00	100.00	u_main_meas_ctrl_shadowed_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_passthru.u_dst_to_src_ack	100.00	100.00	100.00			100.00	100.00

---

Module Instance : tb.dut.u_reg.u_usb_meas_ctrl_shadowed_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
83.33	100.00	66.67

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
97.92	100.00	91.67			100.00	100.00	u_usb_meas_ctrl_shadowed_cdc

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
gen_passthru.u_dst_to_src_ack	100.00	100.00	100.00			100.00	100.00

Line Coverage for Module : prim_reg_cdc_arb ( parameter DataWidth=4,ResetVal=9,DstWrReq=1 )
Line Coverage for Module self-instances :

SCORE	LINE
73.61	90.00

tb.dut.u_reg.u_io_meas_ctrl_en_cdc.u_arb

SCORE	LINE
73.61	90.00

tb.dut.u_reg.u_io_div2_meas_ctrl_en_cdc.u_arb

SCORE	LINE
79.17	94.00

tb.dut.u_reg.u_io_div4_meas_ctrl_en_cdc.u_arb

SCORE	LINE
73.61	90.00

tb.dut.u_reg.u_main_meas_ctrl_en_cdc.u_arb

SCORE	LINE
73.61	90.00

tb.dut.u_reg.u_usb_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		50	47	94.00
CONT_ASSIGN	100	1	1	100.00
ALWAYS	111	3	3	100.00
ALWAYS	121	6	6	100.00
CONT_ASSIGN	135	1	1	100.00
ALWAYS	139	6	6	100.00
ALWAYS	155	10	9	90.00
CONT_ASSIGN	183	1	1	100.00
ALWAYS	187	19	17	89.47
CONT_ASSIGN	228	1	1	100.00
CONT_ASSIGN	243	1	1	100.00
CONT_ASSIGN	244	1	1	100.00

99                        logic dst_update;
100        1/1            assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
           Tests:       T1 T2 T3 
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
112        1/1                  state_q <= StIdle;
           Tests:       T4 T5 T6 
113                           end else begin
114        1/1                  state_q <= state_d;
           Tests:       T4 T5 T6 
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
122        1/1                  dst_req_q <= '0;
           Tests:       T4 T5 T6 
123        1/1                end else if (dst_req_q && dst_lat_d) begin
           Tests:       T4 T5 T6 
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128        1/1                  dst_req_q <= '0;
           Tests:       T7 
129        1/1                end else if (dst_req_i && !dst_req_q && busy) begin
           Tests:       T4 T5 T6 
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132        1/1                  dst_req_q <= 1'b1;
           Tests:       T7 
133                           end
                        MISSING_ELSE
134                         end
135        1/1              assign dst_req = dst_req_q | dst_req_i;
           Tests:       T1 T2 T3 
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
140        1/1                  dst_qs_o <= ResetVal;
           Tests:       T4 T5 T6 
141        1/1                end else if (dst_lat_d) begin
           Tests:       T4 T5 T6 
142        1/1                  dst_qs_o <= dst_ds_i;
           Tests:       T1 T2 T3 
143        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
144        1/1                  dst_qs_o <= dst_qs_i;
           Tests:       T1 T3 T8 
145                           end
                        MISSING_ELSE
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
156        1/1                  id_q <= SelSwReq;
           Tests:       T4 T5 T6 
157        1/1                end else if (dst_update_req && dst_update_ack) begin
           Tests:       T4 T5 T6 
158        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
159        1/1                end else if (dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
160        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
161        1/1                end else if (!dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
162        0/1     ==>          id_q <= SelHwReq;
163        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
164        1/1                  id_q <= SelHwReq;
           Tests:       T1 T3 T8 
165                           end
                        MISSING_ELSE
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183        1/1              assign dst_req_o = ~busy & dst_req;
           Tests:       T1 T2 T3 
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187        1/1                state_d = state_q;
           Tests:       T1 T2 T3 
188        1/1                dst_hold_req = '0;
           Tests:       T1 T2 T3 
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192        1/1                dst_lat_q = '0;
           Tests:       T1 T2 T3 
193        1/1                dst_lat_d = '0;
           Tests:       T1 T2 T3 
194                     
195        1/1                busy = 1'b1;
           Tests:       T1 T2 T3 
196                     
197        1/1                unique case (state_q)
           Tests:       T1 T2 T3 
198                             StIdle: begin
199        1/1                    busy = '0;
           Tests:       T1 T2 T3 
200        1/1                    if (dst_req) begin
           Tests:       T1 T2 T3 
201                                 // there's a software issued request for change
202        1/1                      state_d = StWait;
           Tests:       T1 T2 T3 
203        1/1                      dst_lat_d = 1'b1;
           Tests:       T1 T2 T3 
204        1/1                    end else if (dst_update) begin
           Tests:       T1 T2 T3 
205        0/1     ==>              state_d = StWait;
206        0/1     ==>              dst_lat_d = 1'b1;
207        1/1                    end else if (dst_qs_o != dst_qs_i) begin
           Tests:       T1 T2 T3 
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210        1/1                      state_d = StWait;
           Tests:       T1 T3 T8 
211        1/1                      dst_lat_q = 1'b1;
           Tests:       T1 T3 T8 
212                               end
                        MISSING_ELSE
213                             end
214                     
215                             StWait: begin
216        1/1                    dst_hold_req = 1'b1;
           Tests:       T1 T2 T3 
217        1/1                    if (dst_update_ack) begin
           Tests:       T1 T2 T3 
218        1/1                      state_d = StIdle;
           Tests:       T1 T2 T3 
219                               end
                        MISSING_ELSE
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228        1/1              assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
           Tests:       T1 T2 T3 
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243        1/1              assign src_ack_o = src_req & (id_q == SelSwReq);
           Tests:       T1 T2 T3 
244        1/1              assign src_update_o = src_req & (id_q == SelHwReq);
           Tests:       T1 T2 T3 

---

Line Coverage for Module : prim_reg_cdc_arb ( parameter DataWidth=20,ResetVal,DstWrReq=0 + DataWidth=18,ResetVal=118010,DstWrReq=0 + DataWidth=16,ResetVal=28290,DstWrReq=0 )
Line Coverage for Module self-instances :

SCORE	LINE
83.33	100.00

tb.dut.u_reg.u_io_meas_ctrl_shadowed_cdc.u_arb

SCORE	LINE
83.33	100.00

tb.dut.u_reg.u_io_div2_meas_ctrl_shadowed_cdc.u_arb

SCORE	LINE
83.33	100.00

tb.dut.u_reg.u_io_div4_meas_ctrl_shadowed_cdc.u_arb

SCORE	LINE
83.33	100.00

tb.dut.u_reg.u_main_meas_ctrl_shadowed_cdc.u_arb

SCORE	LINE
83.33	100.00

tb.dut.u_reg.u_usb_meas_ctrl_shadowed_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	2	100.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	1	100.00
CONT_ASSIGN	284	1	1	100.00
CONT_ASSIGN	299	0	0

99                        logic dst_update;
100        unreachable    assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111                           if (!rst_dst_ni) begin
112                             state_q <= StIdle;
113                           end else begin
114                             state_q <= state_d;
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121                           if (!rst_dst_ni) begin
122                             dst_req_q <= '0;
123                           end else if (dst_req_q && dst_lat_d) begin
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128                             dst_req_q <= '0;
129                           end else if (dst_req_i && !dst_req_q && busy) begin
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132                             dst_req_q <= 1'b1;
133                           end
134                         end
135                         assign dst_req = dst_req_q | dst_req_i;
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139                           if (!rst_dst_ni) begin
140                             dst_qs_o <= ResetVal;
141                           end else if (dst_lat_d) begin
142                             dst_qs_o <= dst_ds_i;
143                           end else if (dst_lat_q) begin
144                             dst_qs_o <= dst_qs_i;
145                           end
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155                           if (!rst_dst_ni) begin
156                             id_q <= SelSwReq;
157                           end else if (dst_update_req && dst_update_ack) begin
158                             id_q <= SelSwReq;
159                           end else if (dst_req && dst_lat_d) begin
160                             id_q <= SelSwReq;
161                           end else if (!dst_req && dst_lat_d) begin
162                             id_q <= SelHwReq;
163                           end else if (dst_lat_q) begin
164                             id_q <= SelHwReq;
165                           end
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183                         assign dst_req_o = ~busy & dst_req;
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187                           state_d = state_q;
188                           dst_hold_req = '0;
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192                           dst_lat_q = '0;
193                           dst_lat_d = '0;
194                     
195                           busy = 1'b1;
196                     
197                           unique case (state_q)
198                             StIdle: begin
199                               busy = '0;
200                               if (dst_req) begin
201                                 // there's a software issued request for change
202                                 state_d = StWait;
203                                 dst_lat_d = 1'b1;
204                               end else if (dst_update) begin
205                                 state_d = StWait;
206                                 dst_lat_d = 1'b1;
207                               end else if (dst_qs_o != dst_qs_i) begin
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210                                 state_d = StWait;
211                                 dst_lat_q = 1'b1;
212                               end
213                             end
214                     
215                             StWait: begin
216                               dst_hold_req = 1'b1;
217                               if (dst_update_ack) begin
218                                 state_d = StIdle;
219                               end
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228                         assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243                         assign src_ack_o = src_req & (id_q == SelSwReq);
244                         assign src_update_o = src_req & (id_q == SelHwReq);
245                     
246                         // once hardware makes an update request, we must eventually see an update pulse
247                         `ifdef FPV_ON
248                           `ASSERT(ReqTimeout_A, $rose(id_q == SelHwReq) |-> s_eventually(src_update_o),
249                                   clk_src_i, !rst_src_ni)
250                           // TODO: #14913 check if we can add additional sim assertions.
251                         `endif
252                     
253                         `ifdef FPV_ON
254                           //VCS coverage off
255                           // pragma coverage off
256                     
257                           logic async_flag;
258                           always_ff @(posedge clk_dst_i or negedge rst_dst_ni or posedge src_update_o) begin
259                             if (!rst_dst_ni) begin
260                               async_flag <= '0;
261                             end else if (src_update_o) begin
262                               async_flag <= '0;
263                             end else if (dst_update && !dst_req_o && !busy) begin
264                               async_flag <= 1'b1;
265                             end
266                           end
267                     
268                           //VCS coverage on
269                           // pragma coverage on
270                     
271                           // once hardware makes an update request, we must eventually see an update pulse
272                           // TODO: #14913 check if we can add additional sim assertions.
273                           `ASSERT(UpdateTimeout_A, $rose(async_flag) |-> s_eventually(src_update_o),
274                                   clk_src_i, !rst_src_ni)
275                         `endif
276                     
277                       end else begin : gen_passthru
278                         // when there is no possibility of conflicting HW transactions,
279                         // we can assume that dst_qs_i will only ever take on the value
280                         // that is directly related to the transaction. As a result,
281                         // there is no need to latch further, and the end destination
282                         // can in fact be used as the holding register.
283        1/1              assign dst_qs_o = dst_qs_i;
           Tests:       T1 T2 T3 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T1 T2 T3 
285                     
286                         // since there are no hw transactions, src_update_o is always '0
287                         assign src_update_o = '0;
288                     
289                         prim_pulse_sync u_dst_to_src_ack (
290                           .clk_src_i(clk_dst_i),
291                           .rst_src_ni(rst_dst_ni),
292                           .clk_dst_i(clk_src_i),
293                           .rst_dst_ni(rst_src_ni),
294                           .src_pulse_i(dst_req_i),
295                           .dst_pulse_o(src_ack_o)
296                         );
297                     
298                         logic unused_sigs;
299        unreachable      assign unused_sigs = |{dst_ds_i, dst_update};

---

Cond Coverage for Module : prim_reg_cdc_arb ( parameter DataWidth=4,ResetVal=9,DstWrReq=1 )
Cond Coverage for Module self-instances :

SCORE	COND
73.61	76.19

tb.dut.u_reg.u_io_meas_ctrl_en_cdc.u_arb

SCORE	COND
73.61	76.19

tb.dut.u_reg.u_io_div2_meas_ctrl_en_cdc.u_arb

SCORE	COND
79.17	85.71

tb.dut.u_reg.u_io_div4_meas_ctrl_en_cdc.u_arb

SCORE	COND
73.61	76.19

tb.dut.u_reg.u_main_meas_ctrl_en_cdc.u_arb

SCORE	COND
73.61	76.19

tb.dut.u_reg.u_usb_meas_ctrl_en_cdc.u_arb

	Total	Covered	Percent
Conditions	43	36	83.72
Logical	43	36	83.72
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T2,T3

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

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

 LINE       123
 EXPRESSION (gen_wr_req.dst_req_q && gen_wr_req.dst_lat_d)
             ----------1---------    ----------2---------

-1-	-2-	Status	Tests
0	1	Covered	T1,T2,T3
1	0	Not Covered
1	1	Covered	T7

 LINE       129
 EXPRESSION (dst_req_i && ((!gen_wr_req.dst_req_q)) && gen_wr_req.busy)
             ----1----    ------------2------------    -------3-------

-1-	-2-	-3-	Status	Tests
0	1	1	Covered	T1,T2,T3
1	0	1	Not Covered
1	1	0	Covered	T1,T2,T3
1	1	1	Covered	T7

 LINE       135
 EXPRESSION (gen_wr_req.dst_req_q | dst_req_i)
             ----------1---------   ----2----

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Covered	T1,T2,T3
1	0	Covered	T7

 LINE       157
 EXPRESSION (gen_wr_req.dst_update_req && gen_wr_req.dst_update_ack)
             ------------1------------    ------------2------------

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

 LINE       159
 EXPRESSION (gen_wr_req.dst_req && gen_wr_req.dst_lat_d)
             ---------1--------    ----------2---------

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

 LINE       161
 EXPRESSION (((!gen_wr_req.dst_req)) && gen_wr_req.dst_lat_d)
             -----------1-----------    ----------2---------

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T5,T6
1	1	Not Covered

 LINE       183
 EXPRESSION (((~gen_wr_req.busy)) & gen_wr_req.dst_req)
             ----------1---------   ---------2--------

-1-	-2-	Status	Tests
0	1	Covered	T7
1	0	Covered	T4,T5,T6
1	1	Covered	T1,T2,T3

 LINE       207
 EXPRESSION (dst_qs_o != dst_qs_i)
            -----------1----------

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T1,T3,T8

 LINE       228
 EXPRESSION (gen_wr_req.dst_hold_req | gen_wr_req.dst_lat_d | gen_wr_req.dst_lat_q)
             -----------1-----------   ----------2---------   ----------3---------

-1-	-2-	-3-	Status	Tests
0	0	0	Covered	T4,T5,T6
0	0	1	Covered	T1,T3,T8
0	1	0	Covered	T1,T2,T3
1	0	0	Covered	T1,T2,T3

 LINE       243
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelSwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T3,T8
1	1	Covered	T1,T2,T3

 LINE       243
 SUB-EXPRESSION (gen_wr_req.id_q == SelSwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T1,T3,T8
1	Covered	T4,T5,T6

 LINE       244
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelHwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T3,T8

 LINE       244
 SUB-EXPRESSION (gen_wr_req.id_q == SelHwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T4,T5,T6
1	Covered	T1,T3,T8

---

Cond Coverage for Module : prim_reg_cdc_arb ( parameter DataWidth=20,ResetVal,DstWrReq=0 + DataWidth=18,ResetVal=118010,DstWrReq=0 + DataWidth=16,ResetVal=28290,DstWrReq=0 )
Cond Coverage for Module self-instances :

SCORE	COND
83.33	66.67

tb.dut.u_reg.u_io_meas_ctrl_shadowed_cdc.u_arb

SCORE	COND
83.33	66.67

tb.dut.u_reg.u_main_meas_ctrl_shadowed_cdc.u_arb

SCORE	COND
83.33	66.67

tb.dut.u_reg.u_io_div2_meas_ctrl_shadowed_cdc.u_arb

SCORE	COND
83.33	66.67

tb.dut.u_reg.u_usb_meas_ctrl_shadowed_cdc.u_arb

SCORE	COND
83.33	66.67

tb.dut.u_reg.u_io_div4_meas_ctrl_shadowed_cdc.u_arb

	Total	Covered	Percent
Conditions	3	2	66.67
Logical	3	2	66.67
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

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

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

-1-	Status	Tests
0	Not Covered
1	Covered	T4,T5,T6

---

Branch Coverage for Module : prim_reg_cdc_arb

	Line No.	Total	Covered	Percent
Branches		23	20	86.96
IF	111	2	2	100.00
IF	121	4	4	100.00
IF	139	4	4	100.00
IF	155	6	5	83.33
CASE	197	7	5	71.43

111              if (!rst_dst_ni) begin
                 -1-  
112                state_q <= StIdle;
                   ==>
113              end else begin
114                state_q <= state_d;
                   ==>

Branches:

-1-	Status	Tests
1	Covered	T4,T5,T6
0	Covered	T4,T5,T6

121              if (!rst_dst_ni) begin
                 -1-  
122                dst_req_q <= '0;
                   ==>
123              end else if (dst_req_q && dst_lat_d) begin
                          -2-  
124                // if request is held, when the transaction starts,
125                // automatically clear.
126                // dst_lat_d is safe to used here because dst_req_q, if set,
127                // always has priority over other hardware based events.
128                dst_req_q <= '0;
                   ==>
129              end else if (dst_req_i && !dst_req_q && busy) begin
                          -3-  
130                // if destination request arrives when a handshake event
131                // is already ongoing, hold on to request and send later
132                dst_req_q <= 1'b1;
                   ==>
133              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Covered	T7
0	0	1	Covered	T7
0	0	0	Covered	T4,T5,T6

139              if (!rst_dst_ni) begin
                 -1-  
140                dst_qs_o <= ResetVal;
                   ==>
141              end else if (dst_lat_d) begin
                          -2-  
142                dst_qs_o <= dst_ds_i;
                   ==>
143              end else if (dst_lat_q) begin
                          -3-  
144                dst_qs_o <= dst_qs_i;
                   ==>
145              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Covered	T1,T2,T3
0	0	1	Covered	T1,T3,T8
0	0	0	Covered	T4,T5,T6

155              if (!rst_dst_ni) begin
                 -1-  
156                id_q <= SelSwReq;
                   ==>
157              end else if (dst_update_req && dst_update_ack) begin
                          -2-  
158                id_q <= SelSwReq;
                   ==>
159              end else if (dst_req && dst_lat_d) begin
                          -3-  
160                id_q <= SelSwReq;
                   ==>
161              end else if (!dst_req && dst_lat_d) begin
                          -4-  
162                id_q <= SelHwReq;
                   ==>
163              end else if (dst_lat_q) begin
                          -5-  
164                id_q <= SelHwReq;
                   ==>
165              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
1	-	-	-	-	Covered	T4,T5,T6
0	1	-	-	-	Covered	T1,T2,T3
0	0	1	-	-	Covered	T1,T2,T3
0	0	0	1	-	Not Covered
0	0	0	0	1	Covered	T1,T3,T8
0	0	0	0	0	Covered	T4,T5,T6

197              unique case (state_q)
                        -1-  
198                StIdle: begin
199                  busy = '0;
200                  if (dst_req) begin
                     -2-  
201                    // there's a software issued request for change
202                    state_d = StWait;
                       ==>
203                    dst_lat_d = 1'b1;
204                  end else if (dst_update) begin
                              -3-  
205                    state_d = StWait;
                       ==>
206                    dst_lat_d = 1'b1;
207                  end else if (dst_qs_o != dst_qs_i) begin
                              -4-  
208                    // there's a direct destination update
209                    // that was blocked by an ongoing transaction
210                    state_d = StWait;
                       ==>
211                    dst_lat_q = 1'b1;
212                  end
                     MISSING_ELSE
                     ==>
213                end
214        
215                StWait: begin
216                  dst_hold_req = 1'b1;
217                  if (dst_update_ack) begin
                     -5-  
218                    state_d = StIdle;
                       ==>
219                  end
                     MISSING_ELSE
                     ==>
220                end
221        
222                default: begin
223                  state_d = StIdle;
                     ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
StIdle	1	-	-	-	Covered	T1,T2,T3
StIdle	0	1	-	-	Not Covered
StIdle	0	0	1	-	Covered	T1,T3,T8
StIdle	0	0	0	-	Covered	T1,T2,T3
StWait	-	-	-	1	Covered	T1,T2,T3
StWait	-	-	-	0	Covered	T1,T2,T3
default	-	-	-	-	Not Covered

---

Assert Coverage for Module : prim_reg_cdc_arb

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	2	2	100.00	1	50.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	2	2	100.00	1	50.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
gen_wr_req.DstUpdateReqCheck_A	256610984	0	0	5045
gen_wr_req.HwIdSelCheck_A	256610984	2665	0	0

gen_wr_req.DstUpdateReqCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	256610984	0	0	5045

gen_wr_req.HwIdSelCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	256610984	2665	0	0
T1	103254	5	0	0
T2	77599	0	0	0
T3	181288	10	0	0
T8	0	10	0	0
T9	0	20	0	0
T10	0	15	0	0
T11	0	10	0	0
T12	0	30	0	0
T13	0	5	0	0
T14	0	5	0	0
T15	0	35	0	0
T16	41440	0	0	0
T17	334595	0	0	0
T18	3610	0	0	0
T19	8087	0	0	0
T20	12286	0	0	0
T21	9755	0	0	0
T22	8462	0	0	0

Line Coverage for Instance : tb.dut.u_reg.u_io_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		50	45	90.00
CONT_ASSIGN	100	1	1	100.00
ALWAYS	111	3	3	100.00
ALWAYS	121	6	4	66.67
CONT_ASSIGN	135	1	1	100.00
ALWAYS	139	6	6	100.00
ALWAYS	155	10	9	90.00
CONT_ASSIGN	183	1	1	100.00
ALWAYS	187	19	17	89.47
CONT_ASSIGN	228	1	1	100.00
CONT_ASSIGN	243	1	1	100.00
CONT_ASSIGN	244	1	1	100.00

99                        logic dst_update;
100        1/1            assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
           Tests:       T1 T2 T3 
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
112        1/1                  state_q <= StIdle;
           Tests:       T4 T5 T6 
113                           end else begin
114        1/1                  state_q <= state_d;
           Tests:       T4 T5 T6 
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
122        1/1                  dst_req_q <= '0;
           Tests:       T4 T5 T6 
123        1/1                end else if (dst_req_q && dst_lat_d) begin
           Tests:       T4 T5 T6 
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128        0/1     ==>          dst_req_q <= '0;
129        1/1                end else if (dst_req_i && !dst_req_q && busy) begin
           Tests:       T4 T5 T6 
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132        0/1     ==>          dst_req_q <= 1'b1;
133                           end
                        MISSING_ELSE
134                         end
135        1/1              assign dst_req = dst_req_q | dst_req_i;
           Tests:       T1 T2 T3 
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
140        1/1                  dst_qs_o <= ResetVal;
           Tests:       T4 T5 T6 
141        1/1                end else if (dst_lat_d) begin
           Tests:       T4 T5 T6 
142        1/1                  dst_qs_o <= dst_ds_i;
           Tests:       T1 T2 T3 
143        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
144        1/1                  dst_qs_o <= dst_qs_i;
           Tests:       T1 T3 T8 
145                           end
                        MISSING_ELSE
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
156        1/1                  id_q <= SelSwReq;
           Tests:       T4 T5 T6 
157        1/1                end else if (dst_update_req && dst_update_ack) begin
           Tests:       T4 T5 T6 
158        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
159        1/1                end else if (dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
160        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
161        1/1                end else if (!dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
162        0/1     ==>          id_q <= SelHwReq;
163        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
164        1/1                  id_q <= SelHwReq;
           Tests:       T1 T3 T8 
165                           end
                        MISSING_ELSE
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183        1/1              assign dst_req_o = ~busy & dst_req;
           Tests:       T1 T2 T3 
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187        1/1                state_d = state_q;
           Tests:       T1 T2 T3 
188        1/1                dst_hold_req = '0;
           Tests:       T1 T2 T3 
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192        1/1                dst_lat_q = '0;
           Tests:       T1 T2 T3 
193        1/1                dst_lat_d = '0;
           Tests:       T1 T2 T3 
194                     
195        1/1                busy = 1'b1;
           Tests:       T1 T2 T3 
196                     
197        1/1                unique case (state_q)
           Tests:       T1 T2 T3 
198                             StIdle: begin
199        1/1                    busy = '0;
           Tests:       T1 T2 T3 
200        1/1                    if (dst_req) begin
           Tests:       T1 T2 T3 
201                                 // there's a software issued request for change
202        1/1                      state_d = StWait;
           Tests:       T1 T2 T3 
203        1/1                      dst_lat_d = 1'b1;
           Tests:       T1 T2 T3 
204        1/1                    end else if (dst_update) begin
           Tests:       T1 T2 T3 
205        0/1     ==>              state_d = StWait;
206        0/1     ==>              dst_lat_d = 1'b1;
207        1/1                    end else if (dst_qs_o != dst_qs_i) begin
           Tests:       T1 T2 T3 
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210        1/1                      state_d = StWait;
           Tests:       T1 T3 T8 
211        1/1                      dst_lat_q = 1'b1;
           Tests:       T1 T3 T8 
212                               end
                        MISSING_ELSE
213                             end
214                     
215                             StWait: begin
216        1/1                    dst_hold_req = 1'b1;
           Tests:       T1 T2 T3 
217        1/1                    if (dst_update_ack) begin
           Tests:       T1 T2 T3 
218        1/1                      state_d = StIdle;
           Tests:       T1 T2 T3 
219                               end
                        MISSING_ELSE
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228        1/1              assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
           Tests:       T1 T2 T3 
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243        1/1              assign src_ack_o = src_req & (id_q == SelSwReq);
           Tests:       T1 T2 T3 
244        1/1              assign src_update_o = src_req & (id_q == SelHwReq);
           Tests:       T1 T2 T3 

---

Cond Coverage for Instance : tb.dut.u_reg.u_io_meas_ctrl_en_cdc.u_arb

	Total	Covered	Percent
Conditions	42	32	76.19
Logical	42	32	76.19
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T2,T3

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

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

 LINE       123
 EXPRESSION (gen_wr_req.dst_req_q && gen_wr_req.dst_lat_d)
             ----------1---------    ----------2---------

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

 LINE       129
 EXPRESSION (dst_req_i && ((!gen_wr_req.dst_req_q)) && gen_wr_req.busy)
             ----1----    ------------2------------    -------3-------

-1-	-2-	-3-	Status	Tests
0	1	1	Covered	T1,T2,T3
1	0	1	Not Covered
1	1	0	Covered	T1,T2,T3
1	1	1	Not Covered

 LINE       135
 EXPRESSION (gen_wr_req.dst_req_q | dst_req_i)
             ----------1---------   ----2----

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Covered	T1,T2,T3
1	0	Not Covered

 LINE       157
 EXPRESSION (gen_wr_req.dst_update_req && gen_wr_req.dst_update_ack)
             ------------1------------    ------------2------------

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

 LINE       159
 EXPRESSION (gen_wr_req.dst_req && gen_wr_req.dst_lat_d)
             ---------1--------    ----------2---------

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

 LINE       161
 EXPRESSION (((!gen_wr_req.dst_req)) && gen_wr_req.dst_lat_d)
             -----------1-----------    ----------2---------

-1-	-2-	Status	Tests	Exclude Annotation
0	1	Excluded		VC_COV_UNR
1	0	Covered	T4,T5,T6
1	1	Not Covered

 LINE       183
 EXPRESSION (((~gen_wr_req.busy)) & gen_wr_req.dst_req)
             ----------1---------   ---------2--------

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T5,T6
1	1	Covered	T1,T2,T3

 LINE       207
 EXPRESSION (dst_qs_o != dst_qs_i)
            -----------1----------

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T1,T3,T8

 LINE       228
 EXPRESSION (gen_wr_req.dst_hold_req | gen_wr_req.dst_lat_d | gen_wr_req.dst_lat_q)
             -----------1-----------   ----------2---------   ----------3---------

-1-	-2-	-3-	Status	Tests
0	0	0	Covered	T4,T5,T6
0	0	1	Covered	T1,T3,T8
0	1	0	Covered	T1,T2,T3
1	0	0	Covered	T1,T2,T3

 LINE       243
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelSwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T3,T8
1	1	Covered	T1,T2,T3

 LINE       243
 SUB-EXPRESSION (gen_wr_req.id_q == SelSwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T1,T3,T8
1	Covered	T4,T5,T6

 LINE       244
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelHwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T3,T8

 LINE       244
 SUB-EXPRESSION (gen_wr_req.id_q == SelHwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T4,T5,T6
1	Covered	T1,T3,T8

---

Branch Coverage for Instance : tb.dut.u_reg.u_io_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
Branches		23	18	78.26
IF	111	2	2	100.00
IF	121	4	2	50.00
IF	139	4	4	100.00
IF	155	6	5	83.33
CASE	197	7	5	71.43

111              if (!rst_dst_ni) begin
                 -1-  
112                state_q <= StIdle;
                   ==>
113              end else begin
114                state_q <= state_d;
                   ==>

Branches:

-1-	Status	Tests
1	Covered	T4,T5,T6
0	Covered	T4,T5,T6

121              if (!rst_dst_ni) begin
                 -1-  
122                dst_req_q <= '0;
                   ==>
123              end else if (dst_req_q && dst_lat_d) begin
                          -2-  
124                // if request is held, when the transaction starts,
125                // automatically clear.
126                // dst_lat_d is safe to used here because dst_req_q, if set,
127                // always has priority over other hardware based events.
128                dst_req_q <= '0;
                   ==>
129              end else if (dst_req_i && !dst_req_q && busy) begin
                          -3-  
130                // if destination request arrives when a handshake event
131                // is already ongoing, hold on to request and send later
132                dst_req_q <= 1'b1;
                   ==>
133              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Not Covered
0	0	1	Not Covered
0	0	0	Covered	T4,T5,T6

139              if (!rst_dst_ni) begin
                 -1-  
140                dst_qs_o <= ResetVal;
                   ==>
141              end else if (dst_lat_d) begin
                          -2-  
142                dst_qs_o <= dst_ds_i;
                   ==>
143              end else if (dst_lat_q) begin
                          -3-  
144                dst_qs_o <= dst_qs_i;
                   ==>
145              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Covered	T1,T2,T3
0	0	1	Covered	T1,T3,T8
0	0	0	Covered	T4,T5,T6

155              if (!rst_dst_ni) begin
                 -1-  
156                id_q <= SelSwReq;
                   ==>
157              end else if (dst_update_req && dst_update_ack) begin
                          -2-  
158                id_q <= SelSwReq;
                   ==>
159              end else if (dst_req && dst_lat_d) begin
                          -3-  
160                id_q <= SelSwReq;
                   ==>
161              end else if (!dst_req && dst_lat_d) begin
                          -4-  
162                id_q <= SelHwReq;
                   ==>
163              end else if (dst_lat_q) begin
                          -5-  
164                id_q <= SelHwReq;
                   ==>
165              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
1	-	-	-	-	Covered	T4,T5,T6
0	1	-	-	-	Covered	T1,T2,T3
0	0	1	-	-	Covered	T1,T2,T3
0	0	0	1	-	Not Covered
0	0	0	0	1	Covered	T1,T3,T8
0	0	0	0	0	Covered	T4,T5,T6

197              unique case (state_q)
                        -1-  
198                StIdle: begin
199                  busy = '0;
200                  if (dst_req) begin
                     -2-  
201                    // there's a software issued request for change
202                    state_d = StWait;
                       ==>
203                    dst_lat_d = 1'b1;
204                  end else if (dst_update) begin
                              -3-  
205                    state_d = StWait;
                       ==>
206                    dst_lat_d = 1'b1;
207                  end else if (dst_qs_o != dst_qs_i) begin
                              -4-  
208                    // there's a direct destination update
209                    // that was blocked by an ongoing transaction
210                    state_d = StWait;
                       ==>
211                    dst_lat_q = 1'b1;
212                  end
                     MISSING_ELSE
                     ==>
213                end
214        
215                StWait: begin
216                  dst_hold_req = 1'b1;
217                  if (dst_update_ack) begin
                     -5-  
218                    state_d = StIdle;
                       ==>
219                  end
                     MISSING_ELSE
                     ==>
220                end
221        
222                default: begin
223                  state_d = StIdle;
                     ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
StIdle	1	-	-	-	Covered	T1,T2,T3
StIdle	0	1	-	-	Not Covered
StIdle	0	0	1	-	Covered	T1,T3,T8
StIdle	0	0	0	-	Covered	T1,T2,T3
StWait	-	-	-	1	Covered	T1,T2,T3
StWait	-	-	-	0	Covered	T1,T2,T3
default	-	-	-	-	Not Covered

---

Assert Coverage for Instance : tb.dut.u_reg.u_io_meas_ctrl_en_cdc.u_arb

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	2	2	100.00	1	50.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	2	2	100.00	1	50.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
gen_wr_req.DstUpdateReqCheck_A	76223430	0	0	1009
gen_wr_req.HwIdSelCheck_A	76223430	533	0	0

gen_wr_req.DstUpdateReqCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	76223430	0	0	1009

gen_wr_req.HwIdSelCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	76223430	533	0	0
T1	31395	1	0	0
T2	26431	0	0	0
T3	55098	2	0	0
T8	0	2	0	0
T9	0	4	0	0
T10	0	3	0	0
T11	0	2	0	0
T12	0	6	0	0
T13	0	1	0	0
T14	0	1	0	0
T15	0	7	0	0
T16	13425	0	0	0
T17	83650	0	0	0
T18	1105	0	0	0
T19	2465	0	0	0
T20	3776	0	0	0
T21	2931	0	0	0
T22	2601	0	0	0

Line Coverage for Instance : tb.dut.u_reg.u_io_div2_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		50	45	90.00
CONT_ASSIGN	100	1	1	100.00
ALWAYS	111	3	3	100.00
ALWAYS	121	6	4	66.67
CONT_ASSIGN	135	1	1	100.00
ALWAYS	139	6	6	100.00
ALWAYS	155	10	9	90.00
CONT_ASSIGN	183	1	1	100.00
ALWAYS	187	19	17	89.47
CONT_ASSIGN	228	1	1	100.00
CONT_ASSIGN	243	1	1	100.00
CONT_ASSIGN	244	1	1	100.00

99                        logic dst_update;
100        1/1            assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
           Tests:       T1 T2 T3 
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
112        1/1                  state_q <= StIdle;
           Tests:       T4 T5 T6 
113                           end else begin
114        1/1                  state_q <= state_d;
           Tests:       T4 T5 T6 
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
122        1/1                  dst_req_q <= '0;
           Tests:       T4 T5 T6 
123        1/1                end else if (dst_req_q && dst_lat_d) begin
           Tests:       T4 T5 T6 
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128        0/1     ==>          dst_req_q <= '0;
129        1/1                end else if (dst_req_i && !dst_req_q && busy) begin
           Tests:       T4 T5 T6 
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132        0/1     ==>          dst_req_q <= 1'b1;
133                           end
                        MISSING_ELSE
134                         end
135        1/1              assign dst_req = dst_req_q | dst_req_i;
           Tests:       T1 T2 T3 
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
140        1/1                  dst_qs_o <= ResetVal;
           Tests:       T4 T5 T6 
141        1/1                end else if (dst_lat_d) begin
           Tests:       T4 T5 T6 
142        1/1                  dst_qs_o <= dst_ds_i;
           Tests:       T1 T2 T3 
143        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
144        1/1                  dst_qs_o <= dst_qs_i;
           Tests:       T1 T3 T8 
145                           end
                        MISSING_ELSE
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
156        1/1                  id_q <= SelSwReq;
           Tests:       T4 T5 T6 
157        1/1                end else if (dst_update_req && dst_update_ack) begin
           Tests:       T4 T5 T6 
158        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
159        1/1                end else if (dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
160        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
161        1/1                end else if (!dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
162        0/1     ==>          id_q <= SelHwReq;
163        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
164        1/1                  id_q <= SelHwReq;
           Tests:       T1 T3 T8 
165                           end
                        MISSING_ELSE
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183        1/1              assign dst_req_o = ~busy & dst_req;
           Tests:       T1 T2 T3 
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187        1/1                state_d = state_q;
           Tests:       T1 T2 T3 
188        1/1                dst_hold_req = '0;
           Tests:       T1 T2 T3 
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192        1/1                dst_lat_q = '0;
           Tests:       T1 T2 T3 
193        1/1                dst_lat_d = '0;
           Tests:       T1 T2 T3 
194                     
195        1/1                busy = 1'b1;
           Tests:       T1 T2 T3 
196                     
197        1/1                unique case (state_q)
           Tests:       T1 T2 T3 
198                             StIdle: begin
199        1/1                    busy = '0;
           Tests:       T1 T2 T3 
200        1/1                    if (dst_req) begin
           Tests:       T1 T2 T3 
201                                 // there's a software issued request for change
202        1/1                      state_d = StWait;
           Tests:       T1 T2 T3 
203        1/1                      dst_lat_d = 1'b1;
           Tests:       T1 T2 T3 
204        1/1                    end else if (dst_update) begin
           Tests:       T1 T2 T3 
205        0/1     ==>              state_d = StWait;
206        0/1     ==>              dst_lat_d = 1'b1;
207        1/1                    end else if (dst_qs_o != dst_qs_i) begin
           Tests:       T1 T2 T3 
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210        1/1                      state_d = StWait;
           Tests:       T1 T3 T8 
211        1/1                      dst_lat_q = 1'b1;
           Tests:       T1 T3 T8 
212                               end
                        MISSING_ELSE
213                             end
214                     
215                             StWait: begin
216        1/1                    dst_hold_req = 1'b1;
           Tests:       T1 T2 T3 
217        1/1                    if (dst_update_ack) begin
           Tests:       T1 T2 T3 
218        1/1                      state_d = StIdle;
           Tests:       T1 T2 T3 
219                               end
                        MISSING_ELSE
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228        1/1              assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
           Tests:       T1 T2 T3 
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243        1/1              assign src_ack_o = src_req & (id_q == SelSwReq);
           Tests:       T1 T2 T3 
244        1/1              assign src_update_o = src_req & (id_q == SelHwReq);
           Tests:       T1 T2 T3 

---

Cond Coverage for Instance : tb.dut.u_reg.u_io_div2_meas_ctrl_en_cdc.u_arb

	Total	Covered	Percent
Conditions	42	32	76.19
Logical	42	32	76.19
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T3,T23
1	1	Covered	T1,T2,T3

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

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

 LINE       123
 EXPRESSION (gen_wr_req.dst_req_q && gen_wr_req.dst_lat_d)
             ----------1---------    ----------2---------

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

 LINE       129
 EXPRESSION (dst_req_i && ((!gen_wr_req.dst_req_q)) && gen_wr_req.busy)
             ----1----    ------------2------------    -------3-------

-1-	-2-	-3-	Status	Tests
0	1	1	Covered	T1,T2,T3
1	0	1	Not Covered
1	1	0	Covered	T1,T2,T3
1	1	1	Not Covered

 LINE       135
 EXPRESSION (gen_wr_req.dst_req_q | dst_req_i)
             ----------1---------   ----2----

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Covered	T1,T2,T3
1	0	Not Covered

 LINE       157
 EXPRESSION (gen_wr_req.dst_update_req && gen_wr_req.dst_update_ack)
             ------------1------------    ------------2------------

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

 LINE       159
 EXPRESSION (gen_wr_req.dst_req && gen_wr_req.dst_lat_d)
             ---------1--------    ----------2---------

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

 LINE       161
 EXPRESSION (((!gen_wr_req.dst_req)) && gen_wr_req.dst_lat_d)
             -----------1-----------    ----------2---------

-1-	-2-	Status	Tests	Exclude Annotation
0	1	Excluded		VC_COV_UNR
1	0	Covered	T4,T5,T6
1	1	Not Covered

 LINE       183
 EXPRESSION (((~gen_wr_req.busy)) & gen_wr_req.dst_req)
             ----------1---------   ---------2--------

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T5,T6
1	1	Covered	T1,T2,T3

 LINE       207
 EXPRESSION (dst_qs_o != dst_qs_i)
            -----------1----------

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T1,T3,T8

 LINE       228
 EXPRESSION (gen_wr_req.dst_hold_req | gen_wr_req.dst_lat_d | gen_wr_req.dst_lat_q)
             -----------1-----------   ----------2---------   ----------3---------

-1-	-2-	-3-	Status	Tests
0	0	0	Covered	T4,T5,T6
0	0	1	Covered	T1,T3,T8
0	1	0	Covered	T1,T2,T3
1	0	0	Covered	T1,T2,T3

 LINE       243
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelSwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T3,T8
1	1	Covered	T1,T2,T3

 LINE       243
 SUB-EXPRESSION (gen_wr_req.id_q == SelSwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T1,T3,T8
1	Covered	T4,T5,T6

 LINE       244
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelHwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T3,T8

 LINE       244
 SUB-EXPRESSION (gen_wr_req.id_q == SelHwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T4,T5,T6
1	Covered	T1,T3,T8

---

Branch Coverage for Instance : tb.dut.u_reg.u_io_div2_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
Branches		23	18	78.26
IF	111	2	2	100.00
IF	121	4	2	50.00
IF	139	4	4	100.00
IF	155	6	5	83.33
CASE	197	7	5	71.43

111              if (!rst_dst_ni) begin
                 -1-  
112                state_q <= StIdle;
                   ==>
113              end else begin
114                state_q <= state_d;
                   ==>

Branches:

-1-	Status	Tests
1	Covered	T4,T5,T6
0	Covered	T4,T5,T6

121              if (!rst_dst_ni) begin
                 -1-  
122                dst_req_q <= '0;
                   ==>
123              end else if (dst_req_q && dst_lat_d) begin
                          -2-  
124                // if request is held, when the transaction starts,
125                // automatically clear.
126                // dst_lat_d is safe to used here because dst_req_q, if set,
127                // always has priority over other hardware based events.
128                dst_req_q <= '0;
                   ==>
129              end else if (dst_req_i && !dst_req_q && busy) begin
                          -3-  
130                // if destination request arrives when a handshake event
131                // is already ongoing, hold on to request and send later
132                dst_req_q <= 1'b1;
                   ==>
133              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Not Covered
0	0	1	Not Covered
0	0	0	Covered	T4,T5,T6

139              if (!rst_dst_ni) begin
                 -1-  
140                dst_qs_o <= ResetVal;
                   ==>
141              end else if (dst_lat_d) begin
                          -2-  
142                dst_qs_o <= dst_ds_i;
                   ==>
143              end else if (dst_lat_q) begin
                          -3-  
144                dst_qs_o <= dst_qs_i;
                   ==>
145              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Covered	T1,T2,T3
0	0	1	Covered	T1,T3,T8
0	0	0	Covered	T4,T5,T6

155              if (!rst_dst_ni) begin
                 -1-  
156                id_q <= SelSwReq;
                   ==>
157              end else if (dst_update_req && dst_update_ack) begin
                          -2-  
158                id_q <= SelSwReq;
                   ==>
159              end else if (dst_req && dst_lat_d) begin
                          -3-  
160                id_q <= SelSwReq;
                   ==>
161              end else if (!dst_req && dst_lat_d) begin
                          -4-  
162                id_q <= SelHwReq;
                   ==>
163              end else if (dst_lat_q) begin
                          -5-  
164                id_q <= SelHwReq;
                   ==>
165              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
1	-	-	-	-	Covered	T4,T5,T6
0	1	-	-	-	Covered	T1,T2,T3
0	0	1	-	-	Covered	T1,T2,T3
0	0	0	1	-	Not Covered
0	0	0	0	1	Covered	T1,T3,T8
0	0	0	0	0	Covered	T4,T5,T6

197              unique case (state_q)
                        -1-  
198                StIdle: begin
199                  busy = '0;
200                  if (dst_req) begin
                     -2-  
201                    // there's a software issued request for change
202                    state_d = StWait;
                       ==>
203                    dst_lat_d = 1'b1;
204                  end else if (dst_update) begin
                              -3-  
205                    state_d = StWait;
                       ==>
206                    dst_lat_d = 1'b1;
207                  end else if (dst_qs_o != dst_qs_i) begin
                              -4-  
208                    // there's a direct destination update
209                    // that was blocked by an ongoing transaction
210                    state_d = StWait;
                       ==>
211                    dst_lat_q = 1'b1;
212                  end
                     MISSING_ELSE
                     ==>
213                end
214        
215                StWait: begin
216                  dst_hold_req = 1'b1;
217                  if (dst_update_ack) begin
                     -5-  
218                    state_d = StIdle;
                       ==>
219                  end
                     MISSING_ELSE
                     ==>
220                end
221        
222                default: begin
223                  state_d = StIdle;
                     ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
StIdle	1	-	-	-	Covered	T1,T2,T3
StIdle	0	1	-	-	Not Covered
StIdle	0	0	1	-	Covered	T1,T3,T8
StIdle	0	0	0	-	Covered	T1,T2,T3
StWait	-	-	-	1	Covered	T1,T2,T3
StWait	-	-	-	0	Covered	T1,T2,T3
default	-	-	-	-	Not Covered

---

Assert Coverage for Instance : tb.dut.u_reg.u_io_div2_meas_ctrl_en_cdc.u_arb

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	2	2	100.00	1	50.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	2	2	100.00	1	50.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
gen_wr_req.DstUpdateReqCheck_A	37213486	0	0	1009
gen_wr_req.HwIdSelCheck_A	37213486	533	0	0

gen_wr_req.DstUpdateReqCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	37213486	0	0	1009

gen_wr_req.HwIdSelCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	37213486	533	0	0
T1	15637	1	0	0
T2	6945	0	0	0
T3	27496	2	0	0
T8	0	2	0	0
T9	0	4	0	0
T10	0	3	0	0
T11	0	2	0	0
T12	0	6	0	0
T13	0	1	0	0
T14	0	1	0	0
T15	0	7	0	0
T16	4875	0	0	0
T17	41799	0	0	0
T18	534	0	0	0
T19	1214	0	0	0
T20	1842	0	0	0
T21	1538	0	0	0
T22	1234	0	0	0

Line Coverage for Instance : tb.dut.u_reg.u_main_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		50	45	90.00
CONT_ASSIGN	100	1	1	100.00
ALWAYS	111	3	3	100.00
ALWAYS	121	6	4	66.67
CONT_ASSIGN	135	1	1	100.00
ALWAYS	139	6	6	100.00
ALWAYS	155	10	9	90.00
CONT_ASSIGN	183	1	1	100.00
ALWAYS	187	19	17	89.47
CONT_ASSIGN	228	1	1	100.00
CONT_ASSIGN	243	1	1	100.00
CONT_ASSIGN	244	1	1	100.00

99                        logic dst_update;
100        1/1            assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
           Tests:       T1 T2 T3 
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
112        1/1                  state_q <= StIdle;
           Tests:       T4 T5 T6 
113                           end else begin
114        1/1                  state_q <= state_d;
           Tests:       T4 T5 T6 
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
122        1/1                  dst_req_q <= '0;
           Tests:       T4 T5 T6 
123        1/1                end else if (dst_req_q && dst_lat_d) begin
           Tests:       T4 T5 T6 
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128        0/1     ==>          dst_req_q <= '0;
129        1/1                end else if (dst_req_i && !dst_req_q && busy) begin
           Tests:       T4 T5 T6 
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132        0/1     ==>          dst_req_q <= 1'b1;
133                           end
                        MISSING_ELSE
134                         end
135        1/1              assign dst_req = dst_req_q | dst_req_i;
           Tests:       T1 T2 T3 
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
140        1/1                  dst_qs_o <= ResetVal;
           Tests:       T4 T5 T6 
141        1/1                end else if (dst_lat_d) begin
           Tests:       T4 T5 T6 
142        1/1                  dst_qs_o <= dst_ds_i;
           Tests:       T1 T2 T3 
143        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
144        1/1                  dst_qs_o <= dst_qs_i;
           Tests:       T1 T3 T8 
145                           end
                        MISSING_ELSE
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
156        1/1                  id_q <= SelSwReq;
           Tests:       T4 T5 T6 
157        1/1                end else if (dst_update_req && dst_update_ack) begin
           Tests:       T4 T5 T6 
158        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
159        1/1                end else if (dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
160        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
161        1/1                end else if (!dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
162        0/1     ==>          id_q <= SelHwReq;
163        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
164        1/1                  id_q <= SelHwReq;
           Tests:       T1 T3 T8 
165                           end
                        MISSING_ELSE
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183        1/1              assign dst_req_o = ~busy & dst_req;
           Tests:       T1 T2 T3 
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187        1/1                state_d = state_q;
           Tests:       T1 T2 T3 
188        1/1                dst_hold_req = '0;
           Tests:       T1 T2 T3 
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192        1/1                dst_lat_q = '0;
           Tests:       T1 T2 T3 
193        1/1                dst_lat_d = '0;
           Tests:       T1 T2 T3 
194                     
195        1/1                busy = 1'b1;
           Tests:       T1 T2 T3 
196                     
197        1/1                unique case (state_q)
           Tests:       T1 T2 T3 
198                             StIdle: begin
199        1/1                    busy = '0;
           Tests:       T1 T2 T3 
200        1/1                    if (dst_req) begin
           Tests:       T1 T2 T3 
201                                 // there's a software issued request for change
202        1/1                      state_d = StWait;
           Tests:       T1 T2 T3 
203        1/1                      dst_lat_d = 1'b1;
           Tests:       T1 T2 T3 
204        1/1                    end else if (dst_update) begin
           Tests:       T1 T2 T3 
205        0/1     ==>              state_d = StWait;
206        0/1     ==>              dst_lat_d = 1'b1;
207        1/1                    end else if (dst_qs_o != dst_qs_i) begin
           Tests:       T1 T2 T3 
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210        1/1                      state_d = StWait;
           Tests:       T1 T3 T8 
211        1/1                      dst_lat_q = 1'b1;
           Tests:       T1 T3 T8 
212                               end
                        MISSING_ELSE
213                             end
214                     
215                             StWait: begin
216        1/1                    dst_hold_req = 1'b1;
           Tests:       T1 T2 T3 
217        1/1                    if (dst_update_ack) begin
           Tests:       T1 T2 T3 
218        1/1                      state_d = StIdle;
           Tests:       T1 T2 T3 
219                               end
                        MISSING_ELSE
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228        1/1              assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
           Tests:       T1 T2 T3 
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243        1/1              assign src_ack_o = src_req & (id_q == SelSwReq);
           Tests:       T1 T2 T3 
244        1/1              assign src_update_o = src_req & (id_q == SelHwReq);
           Tests:       T1 T2 T3 

---

Cond Coverage for Instance : tb.dut.u_reg.u_main_meas_ctrl_en_cdc.u_arb

	Total	Covered	Percent
Conditions	42	32	76.19
Logical	42	32	76.19
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T2,T3

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

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

 LINE       123
 EXPRESSION (gen_wr_req.dst_req_q && gen_wr_req.dst_lat_d)
             ----------1---------    ----------2---------

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

 LINE       129
 EXPRESSION (dst_req_i && ((!gen_wr_req.dst_req_q)) && gen_wr_req.busy)
             ----1----    ------------2------------    -------3-------

-1-	-2-	-3-	Status	Tests
0	1	1	Covered	T1,T2,T3
1	0	1	Not Covered
1	1	0	Covered	T1,T2,T3
1	1	1	Not Covered

 LINE       135
 EXPRESSION (gen_wr_req.dst_req_q | dst_req_i)
             ----------1---------   ----2----

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Covered	T1,T2,T3
1	0	Not Covered

 LINE       157
 EXPRESSION (gen_wr_req.dst_update_req && gen_wr_req.dst_update_ack)
             ------------1------------    ------------2------------

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

 LINE       159
 EXPRESSION (gen_wr_req.dst_req && gen_wr_req.dst_lat_d)
             ---------1--------    ----------2---------

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

 LINE       161
 EXPRESSION (((!gen_wr_req.dst_req)) && gen_wr_req.dst_lat_d)
             -----------1-----------    ----------2---------

-1-	-2-	Status	Tests	Exclude Annotation
0	1	Excluded		VC_COV_UNR
1	0	Covered	T4,T5,T6
1	1	Not Covered

 LINE       183
 EXPRESSION (((~gen_wr_req.busy)) & gen_wr_req.dst_req)
             ----------1---------   ---------2--------

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T5,T6
1	1	Covered	T1,T2,T3

 LINE       207
 EXPRESSION (dst_qs_o != dst_qs_i)
            -----------1----------

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T1,T3,T8

 LINE       228
 EXPRESSION (gen_wr_req.dst_hold_req | gen_wr_req.dst_lat_d | gen_wr_req.dst_lat_q)
             -----------1-----------   ----------2---------   ----------3---------

-1-	-2-	-3-	Status	Tests
0	0	0	Covered	T4,T5,T6
0	0	1	Covered	T1,T3,T8
0	1	0	Covered	T1,T2,T3
1	0	0	Covered	T1,T2,T3

 LINE       243
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelSwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T3,T8
1	1	Covered	T1,T2,T3

 LINE       243
 SUB-EXPRESSION (gen_wr_req.id_q == SelSwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T1,T3,T8
1	Covered	T4,T5,T6

 LINE       244
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelHwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T3,T8

 LINE       244
 SUB-EXPRESSION (gen_wr_req.id_q == SelHwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T4,T5,T6
1	Covered	T1,T3,T8

---

Branch Coverage for Instance : tb.dut.u_reg.u_main_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
Branches		23	18	78.26
IF	111	2	2	100.00
IF	121	4	2	50.00
IF	139	4	4	100.00
IF	155	6	5	83.33
CASE	197	7	5	71.43

111              if (!rst_dst_ni) begin
                 -1-  
112                state_q <= StIdle;
                   ==>
113              end else begin
114                state_q <= state_d;
                   ==>

Branches:

-1-	Status	Tests
1	Covered	T4,T5,T6
0	Covered	T4,T5,T6

121              if (!rst_dst_ni) begin
                 -1-  
122                dst_req_q <= '0;
                   ==>
123              end else if (dst_req_q && dst_lat_d) begin
                          -2-  
124                // if request is held, when the transaction starts,
125                // automatically clear.
126                // dst_lat_d is safe to used here because dst_req_q, if set,
127                // always has priority over other hardware based events.
128                dst_req_q <= '0;
                   ==>
129              end else if (dst_req_i && !dst_req_q && busy) begin
                          -3-  
130                // if destination request arrives when a handshake event
131                // is already ongoing, hold on to request and send later
132                dst_req_q <= 1'b1;
                   ==>
133              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Not Covered
0	0	1	Not Covered
0	0	0	Covered	T4,T5,T6

139              if (!rst_dst_ni) begin
                 -1-  
140                dst_qs_o <= ResetVal;
                   ==>
141              end else if (dst_lat_d) begin
                          -2-  
142                dst_qs_o <= dst_ds_i;
                   ==>
143              end else if (dst_lat_q) begin
                          -3-  
144                dst_qs_o <= dst_qs_i;
                   ==>
145              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Covered	T1,T2,T3
0	0	1	Covered	T1,T3,T8
0	0	0	Covered	T4,T5,T6

155              if (!rst_dst_ni) begin
                 -1-  
156                id_q <= SelSwReq;
                   ==>
157              end else if (dst_update_req && dst_update_ack) begin
                          -2-  
158                id_q <= SelSwReq;
                   ==>
159              end else if (dst_req && dst_lat_d) begin
                          -3-  
160                id_q <= SelSwReq;
                   ==>
161              end else if (!dst_req && dst_lat_d) begin
                          -4-  
162                id_q <= SelHwReq;
                   ==>
163              end else if (dst_lat_q) begin
                          -5-  
164                id_q <= SelHwReq;
                   ==>
165              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
1	-	-	-	-	Covered	T4,T5,T6
0	1	-	-	-	Covered	T1,T2,T3
0	0	1	-	-	Covered	T1,T2,T3
0	0	0	1	-	Not Covered
0	0	0	0	1	Covered	T1,T3,T8
0	0	0	0	0	Covered	T4,T5,T6

197              unique case (state_q)
                        -1-  
198                StIdle: begin
199                  busy = '0;
200                  if (dst_req) begin
                     -2-  
201                    // there's a software issued request for change
202                    state_d = StWait;
                       ==>
203                    dst_lat_d = 1'b1;
204                  end else if (dst_update) begin
                              -3-  
205                    state_d = StWait;
                       ==>
206                    dst_lat_d = 1'b1;
207                  end else if (dst_qs_o != dst_qs_i) begin
                              -4-  
208                    // there's a direct destination update
209                    // that was blocked by an ongoing transaction
210                    state_d = StWait;
                       ==>
211                    dst_lat_q = 1'b1;
212                  end
                     MISSING_ELSE
                     ==>
213                end
214        
215                StWait: begin
216                  dst_hold_req = 1'b1;
217                  if (dst_update_ack) begin
                     -5-  
218                    state_d = StIdle;
                       ==>
219                  end
                     MISSING_ELSE
                     ==>
220                end
221        
222                default: begin
223                  state_d = StIdle;
                     ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
StIdle	1	-	-	-	Covered	T1,T2,T3
StIdle	0	1	-	-	Not Covered
StIdle	0	0	1	-	Covered	T1,T3,T8
StIdle	0	0	0	-	Covered	T1,T2,T3
StWait	-	-	-	1	Covered	T1,T2,T3
StWait	-	-	-	0	Covered	T1,T2,T3
default	-	-	-	-	Not Covered

---

Assert Coverage for Instance : tb.dut.u_reg.u_main_meas_ctrl_en_cdc.u_arb

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	2	2	100.00	1	50.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	2	2	100.00	1	50.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
gen_wr_req.DstUpdateReqCheck_A	84182409	0	0	1009
gen_wr_req.HwIdSelCheck_A	84182409	533	0	0

gen_wr_req.DstUpdateReqCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	84182409	0	0	1009

gen_wr_req.HwIdSelCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	84182409	533	0	0
T1	32705	1	0	0
T2	27534	0	0	0
T3	57396	2	0	0
T8	0	2	0	0
T9	0	4	0	0
T10	0	3	0	0
T11	0	2	0	0
T12	0	6	0	0
T13	0	1	0	0
T14	0	1	0	0
T15	0	7	0	0
T16	13985	0	0	0
T17	129139	0	0	0
T18	1151	0	0	0
T19	2568	0	0	0
T20	3830	0	0	0
T21	3053	0	0	0
T22	2710	0	0	0

Line Coverage for Instance : tb.dut.u_reg.u_usb_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		50	45	90.00
CONT_ASSIGN	100	1	1	100.00
ALWAYS	111	3	3	100.00
ALWAYS	121	6	4	66.67
CONT_ASSIGN	135	1	1	100.00
ALWAYS	139	6	6	100.00
ALWAYS	155	10	9	90.00
CONT_ASSIGN	183	1	1	100.00
ALWAYS	187	19	17	89.47
CONT_ASSIGN	228	1	1	100.00
CONT_ASSIGN	243	1	1	100.00
CONT_ASSIGN	244	1	1	100.00

99                        logic dst_update;
100        1/1            assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
           Tests:       T1 T2 T3 
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
112        1/1                  state_q <= StIdle;
           Tests:       T4 T5 T6 
113                           end else begin
114        1/1                  state_q <= state_d;
           Tests:       T4 T5 T6 
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
122        1/1                  dst_req_q <= '0;
           Tests:       T4 T5 T6 
123        1/1                end else if (dst_req_q && dst_lat_d) begin
           Tests:       T4 T5 T6 
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128        0/1     ==>          dst_req_q <= '0;
129        1/1                end else if (dst_req_i && !dst_req_q && busy) begin
           Tests:       T4 T5 T6 
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132        0/1     ==>          dst_req_q <= 1'b1;
133                           end
                        MISSING_ELSE
134                         end
135        1/1              assign dst_req = dst_req_q | dst_req_i;
           Tests:       T1 T2 T3 
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
140        1/1                  dst_qs_o <= ResetVal;
           Tests:       T4 T5 T6 
141        1/1                end else if (dst_lat_d) begin
           Tests:       T4 T5 T6 
142        1/1                  dst_qs_o <= dst_ds_i;
           Tests:       T1 T2 T3 
143        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
144        1/1                  dst_qs_o <= dst_qs_i;
           Tests:       T1 T3 T8 
145                           end
                        MISSING_ELSE
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
156        1/1                  id_q <= SelSwReq;
           Tests:       T4 T5 T6 
157        1/1                end else if (dst_update_req && dst_update_ack) begin
           Tests:       T4 T5 T6 
158        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
159        1/1                end else if (dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
160        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
161        1/1                end else if (!dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
162        0/1     ==>          id_q <= SelHwReq;
163        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
164        1/1                  id_q <= SelHwReq;
           Tests:       T1 T3 T8 
165                           end
                        MISSING_ELSE
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183        1/1              assign dst_req_o = ~busy & dst_req;
           Tests:       T1 T2 T3 
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187        1/1                state_d = state_q;
           Tests:       T1 T2 T3 
188        1/1                dst_hold_req = '0;
           Tests:       T1 T2 T3 
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192        1/1                dst_lat_q = '0;
           Tests:       T1 T2 T3 
193        1/1                dst_lat_d = '0;
           Tests:       T1 T2 T3 
194                     
195        1/1                busy = 1'b1;
           Tests:       T1 T2 T3 
196                     
197        1/1                unique case (state_q)
           Tests:       T1 T2 T3 
198                             StIdle: begin
199        1/1                    busy = '0;
           Tests:       T1 T2 T3 
200        1/1                    if (dst_req) begin
           Tests:       T1 T2 T3 
201                                 // there's a software issued request for change
202        1/1                      state_d = StWait;
           Tests:       T1 T2 T3 
203        1/1                      dst_lat_d = 1'b1;
           Tests:       T1 T2 T3 
204        1/1                    end else if (dst_update) begin
           Tests:       T1 T2 T3 
205        0/1     ==>              state_d = StWait;
206        0/1     ==>              dst_lat_d = 1'b1;
207        1/1                    end else if (dst_qs_o != dst_qs_i) begin
           Tests:       T1 T2 T3 
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210        1/1                      state_d = StWait;
           Tests:       T1 T3 T8 
211        1/1                      dst_lat_q = 1'b1;
           Tests:       T1 T3 T8 
212                               end
                        MISSING_ELSE
213                             end
214                     
215                             StWait: begin
216        1/1                    dst_hold_req = 1'b1;
           Tests:       T1 T2 T3 
217        1/1                    if (dst_update_ack) begin
           Tests:       T1 T2 T3 
218        1/1                      state_d = StIdle;
           Tests:       T1 T2 T3 
219                               end
                        MISSING_ELSE
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228        1/1              assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
           Tests:       T1 T2 T3 
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243        1/1              assign src_ack_o = src_req & (id_q == SelSwReq);
           Tests:       T1 T2 T3 
244        1/1              assign src_update_o = src_req & (id_q == SelHwReq);
           Tests:       T1 T2 T3 

---

Cond Coverage for Instance : tb.dut.u_reg.u_usb_meas_ctrl_en_cdc.u_arb

	Total	Covered	Percent
Conditions	42	32	76.19
Logical	42	32	76.19
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T2,T3

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

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

 LINE       123
 EXPRESSION (gen_wr_req.dst_req_q && gen_wr_req.dst_lat_d)
             ----------1---------    ----------2---------

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

 LINE       129
 EXPRESSION (dst_req_i && ((!gen_wr_req.dst_req_q)) && gen_wr_req.busy)
             ----1----    ------------2------------    -------3-------

-1-	-2-	-3-	Status	Tests
0	1	1	Covered	T1,T2,T3
1	0	1	Not Covered
1	1	0	Covered	T1,T2,T3
1	1	1	Not Covered

 LINE       135
 EXPRESSION (gen_wr_req.dst_req_q | dst_req_i)
             ----------1---------   ----2----

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Covered	T1,T2,T3
1	0	Not Covered

 LINE       157
 EXPRESSION (gen_wr_req.dst_update_req && gen_wr_req.dst_update_ack)
             ------------1------------    ------------2------------

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

 LINE       159
 EXPRESSION (gen_wr_req.dst_req && gen_wr_req.dst_lat_d)
             ---------1--------    ----------2---------

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

 LINE       161
 EXPRESSION (((!gen_wr_req.dst_req)) && gen_wr_req.dst_lat_d)
             -----------1-----------    ----------2---------

-1-	-2-	Status	Tests	Exclude Annotation
0	1	Excluded		VC_COV_UNR
1	0	Covered	T4,T5,T6
1	1	Not Covered

 LINE       183
 EXPRESSION (((~gen_wr_req.busy)) & gen_wr_req.dst_req)
             ----------1---------   ---------2--------

-1-	-2-	Status	Tests
0	1	Not Covered
1	0	Covered	T4,T5,T6
1	1	Covered	T1,T2,T3

 LINE       207
 EXPRESSION (dst_qs_o != dst_qs_i)
            -----------1----------

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T1,T3,T8

 LINE       228
 EXPRESSION (gen_wr_req.dst_hold_req | gen_wr_req.dst_lat_d | gen_wr_req.dst_lat_q)
             -----------1-----------   ----------2---------   ----------3---------

-1-	-2-	-3-	Status	Tests
0	0	0	Covered	T4,T5,T6
0	0	1	Covered	T1,T3,T8
0	1	0	Covered	T1,T2,T3
1	0	0	Covered	T1,T2,T3

 LINE       243
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelSwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T3,T8
1	1	Covered	T1,T2,T3

 LINE       243
 SUB-EXPRESSION (gen_wr_req.id_q == SelSwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T1,T3,T8
1	Covered	T4,T5,T6

 LINE       244
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelHwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T3,T8

 LINE       244
 SUB-EXPRESSION (gen_wr_req.id_q == SelHwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T4,T5,T6
1	Covered	T1,T3,T8

---

Branch Coverage for Instance : tb.dut.u_reg.u_usb_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
Branches		23	18	78.26
IF	111	2	2	100.00
IF	121	4	2	50.00
IF	139	4	4	100.00
IF	155	6	5	83.33
CASE	197	7	5	71.43

111              if (!rst_dst_ni) begin
                 -1-  
112                state_q <= StIdle;
                   ==>
113              end else begin
114                state_q <= state_d;
                   ==>

Branches:

-1-	Status	Tests
1	Covered	T4,T5,T6
0	Covered	T4,T5,T6

121              if (!rst_dst_ni) begin
                 -1-  
122                dst_req_q <= '0;
                   ==>
123              end else if (dst_req_q && dst_lat_d) begin
                          -2-  
124                // if request is held, when the transaction starts,
125                // automatically clear.
126                // dst_lat_d is safe to used here because dst_req_q, if set,
127                // always has priority over other hardware based events.
128                dst_req_q <= '0;
                   ==>
129              end else if (dst_req_i && !dst_req_q && busy) begin
                          -3-  
130                // if destination request arrives when a handshake event
131                // is already ongoing, hold on to request and send later
132                dst_req_q <= 1'b1;
                   ==>
133              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Not Covered
0	0	1	Not Covered
0	0	0	Covered	T4,T5,T6

139              if (!rst_dst_ni) begin
                 -1-  
140                dst_qs_o <= ResetVal;
                   ==>
141              end else if (dst_lat_d) begin
                          -2-  
142                dst_qs_o <= dst_ds_i;
                   ==>
143              end else if (dst_lat_q) begin
                          -3-  
144                dst_qs_o <= dst_qs_i;
                   ==>
145              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Covered	T1,T2,T3
0	0	1	Covered	T1,T3,T8
0	0	0	Covered	T4,T5,T6

155              if (!rst_dst_ni) begin
                 -1-  
156                id_q <= SelSwReq;
                   ==>
157              end else if (dst_update_req && dst_update_ack) begin
                          -2-  
158                id_q <= SelSwReq;
                   ==>
159              end else if (dst_req && dst_lat_d) begin
                          -3-  
160                id_q <= SelSwReq;
                   ==>
161              end else if (!dst_req && dst_lat_d) begin
                          -4-  
162                id_q <= SelHwReq;
                   ==>
163              end else if (dst_lat_q) begin
                          -5-  
164                id_q <= SelHwReq;
                   ==>
165              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
1	-	-	-	-	Covered	T4,T5,T6
0	1	-	-	-	Covered	T1,T2,T3
0	0	1	-	-	Covered	T1,T2,T3
0	0	0	1	-	Not Covered
0	0	0	0	1	Covered	T1,T3,T8
0	0	0	0	0	Covered	T4,T5,T6

197              unique case (state_q)
                        -1-  
198                StIdle: begin
199                  busy = '0;
200                  if (dst_req) begin
                     -2-  
201                    // there's a software issued request for change
202                    state_d = StWait;
                       ==>
203                    dst_lat_d = 1'b1;
204                  end else if (dst_update) begin
                              -3-  
205                    state_d = StWait;
                       ==>
206                    dst_lat_d = 1'b1;
207                  end else if (dst_qs_o != dst_qs_i) begin
                              -4-  
208                    // there's a direct destination update
209                    // that was blocked by an ongoing transaction
210                    state_d = StWait;
                       ==>
211                    dst_lat_q = 1'b1;
212                  end
                     MISSING_ELSE
                     ==>
213                end
214        
215                StWait: begin
216                  dst_hold_req = 1'b1;
217                  if (dst_update_ack) begin
                     -5-  
218                    state_d = StIdle;
                       ==>
219                  end
                     MISSING_ELSE
                     ==>
220                end
221        
222                default: begin
223                  state_d = StIdle;
                     ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
StIdle	1	-	-	-	Covered	T1,T2,T3
StIdle	0	1	-	-	Not Covered
StIdle	0	0	1	-	Covered	T1,T3,T8
StIdle	0	0	0	-	Covered	T1,T2,T3
StWait	-	-	-	1	Covered	T1,T2,T3
StWait	-	-	-	0	Covered	T1,T2,T3
default	-	-	-	-	Not Covered

---

Assert Coverage for Instance : tb.dut.u_reg.u_usb_meas_ctrl_en_cdc.u_arb

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	2	2	100.00	1	50.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	2	2	100.00	1	50.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
gen_wr_req.DstUpdateReqCheck_A	40385383	0	0	1009
gen_wr_req.HwIdSelCheck_A	40385383	533	0	0

gen_wr_req.DstUpdateReqCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	40385383	0	0	1009

gen_wr_req.HwIdSelCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	40385383	533	0	0
T1	15698	1	0	0
T2	13216	0	0	0
T3	27550	2	0	0
T8	0	2	0	0
T9	0	4	0	0
T10	0	3	0	0
T11	0	2	0	0
T12	0	6	0	0
T13	0	1	0	0
T14	0	1	0	0
T15	0	7	0	0
T16	6713	0	0	0
T17	59107	0	0	0
T18	553	0	0	0
T19	1233	0	0	0
T20	1917	0	0	0
T21	1465	0	0	0
T22	1300	0	0	0

Line Coverage for Instance : tb.dut.u_reg.u_io_div4_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		50	47	94.00
CONT_ASSIGN	100	1	1	100.00
ALWAYS	111	3	3	100.00
ALWAYS	121	6	6	100.00
CONT_ASSIGN	135	1	1	100.00
ALWAYS	139	6	6	100.00
ALWAYS	155	10	9	90.00
CONT_ASSIGN	183	1	1	100.00
ALWAYS	187	19	17	89.47
CONT_ASSIGN	228	1	1	100.00
CONT_ASSIGN	243	1	1	100.00
CONT_ASSIGN	244	1	1	100.00

99                        logic dst_update;
100        1/1            assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
           Tests:       T1 T2 T3 
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
112        1/1                  state_q <= StIdle;
           Tests:       T4 T5 T6 
113                           end else begin
114        1/1                  state_q <= state_d;
           Tests:       T4 T5 T6 
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
122        1/1                  dst_req_q <= '0;
           Tests:       T4 T5 T6 
123        1/1                end else if (dst_req_q && dst_lat_d) begin
           Tests:       T4 T5 T6 
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128        1/1                  dst_req_q <= '0;
           Tests:       T7 
129        1/1                end else if (dst_req_i && !dst_req_q && busy) begin
           Tests:       T4 T5 T6 
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132        1/1                  dst_req_q <= 1'b1;
           Tests:       T7 
133                           end
                        MISSING_ELSE
134                         end
135        1/1              assign dst_req = dst_req_q | dst_req_i;
           Tests:       T1 T2 T3 
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
140        1/1                  dst_qs_o <= ResetVal;
           Tests:       T4 T5 T6 
141        1/1                end else if (dst_lat_d) begin
           Tests:       T4 T5 T6 
142        1/1                  dst_qs_o <= dst_ds_i;
           Tests:       T1 T2 T3 
143        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
144        1/1                  dst_qs_o <= dst_qs_i;
           Tests:       T1 T3 T8 
145                           end
                        MISSING_ELSE
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155        1/1                if (!rst_dst_ni) begin
           Tests:       T4 T5 T6 
156        1/1                  id_q <= SelSwReq;
           Tests:       T4 T5 T6 
157        1/1                end else if (dst_update_req && dst_update_ack) begin
           Tests:       T4 T5 T6 
158        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
159        1/1                end else if (dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
160        1/1                  id_q <= SelSwReq;
           Tests:       T1 T2 T3 
161        1/1                end else if (!dst_req && dst_lat_d) begin
           Tests:       T4 T5 T6 
162        0/1     ==>          id_q <= SelHwReq;
163        1/1                end else if (dst_lat_q) begin
           Tests:       T4 T5 T6 
164        1/1                  id_q <= SelHwReq;
           Tests:       T1 T3 T8 
165                           end
                        MISSING_ELSE
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183        1/1              assign dst_req_o = ~busy & dst_req;
           Tests:       T1 T2 T3 
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187        1/1                state_d = state_q;
           Tests:       T1 T2 T3 
188        1/1                dst_hold_req = '0;
           Tests:       T1 T2 T3 
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192        1/1                dst_lat_q = '0;
           Tests:       T1 T2 T3 
193        1/1                dst_lat_d = '0;
           Tests:       T1 T2 T3 
194                     
195        1/1                busy = 1'b1;
           Tests:       T1 T2 T3 
196                     
197        1/1                unique case (state_q)
           Tests:       T1 T2 T3 
198                             StIdle: begin
199        1/1                    busy = '0;
           Tests:       T1 T2 T3 
200        1/1                    if (dst_req) begin
           Tests:       T1 T2 T3 
201                                 // there's a software issued request for change
202        1/1                      state_d = StWait;
           Tests:       T1 T2 T3 
203        1/1                      dst_lat_d = 1'b1;
           Tests:       T1 T2 T3 
204        1/1                    end else if (dst_update) begin
           Tests:       T1 T2 T3 
205        0/1     ==>              state_d = StWait;
206        0/1     ==>              dst_lat_d = 1'b1;
207        1/1                    end else if (dst_qs_o != dst_qs_i) begin
           Tests:       T1 T2 T3 
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210        1/1                      state_d = StWait;
           Tests:       T1 T3 T8 
211        1/1                      dst_lat_q = 1'b1;
           Tests:       T1 T3 T8 
212                               end
                        MISSING_ELSE
213                             end
214                     
215                             StWait: begin
216        1/1                    dst_hold_req = 1'b1;
           Tests:       T1 T2 T3 
217        1/1                    if (dst_update_ack) begin
           Tests:       T1 T2 T3 
218        1/1                      state_d = StIdle;
           Tests:       T1 T2 T3 
219                               end
                        MISSING_ELSE
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228        1/1              assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
           Tests:       T1 T2 T3 
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243        1/1              assign src_ack_o = src_req & (id_q == SelSwReq);
           Tests:       T1 T2 T3 
244        1/1              assign src_update_o = src_req & (id_q == SelHwReq);
           Tests:       T1 T2 T3 

---

Cond Coverage for Instance : tb.dut.u_reg.u_io_div4_meas_ctrl_en_cdc.u_arb

	Total	Covered	Percent
Conditions	42	36	85.71
Logical	42	36	85.71
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T3,T23
1	1	Covered	T1,T2,T3

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

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

 LINE       123
 EXPRESSION (gen_wr_req.dst_req_q && gen_wr_req.dst_lat_d)
             ----------1---------    ----------2---------

-1-	-2-	Status	Tests
0	1	Covered	T1,T2,T3
1	0	Not Covered
1	1	Covered	T7

 LINE       129
 EXPRESSION (dst_req_i && ((!gen_wr_req.dst_req_q)) && gen_wr_req.busy)
             ----1----    ------------2------------    -------3-------

-1-	-2-	-3-	Status	Tests
0	1	1	Covered	T1,T2,T3
1	0	1	Not Covered
1	1	0	Covered	T1,T2,T3
1	1	1	Covered	T7

 LINE       135
 EXPRESSION (gen_wr_req.dst_req_q | dst_req_i)
             ----------1---------   ----2----

-1-	-2-	Status	Tests
0	0	Covered	T4,T5,T6
0	1	Covered	T1,T2,T3
1	0	Covered	T7

 LINE       157
 EXPRESSION (gen_wr_req.dst_update_req && gen_wr_req.dst_update_ack)
             ------------1------------    ------------2------------

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

 LINE       159
 EXPRESSION (gen_wr_req.dst_req && gen_wr_req.dst_lat_d)
             ---------1--------    ----------2---------

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

 LINE       161
 EXPRESSION (((!gen_wr_req.dst_req)) && gen_wr_req.dst_lat_d)
             -----------1-----------    ----------2---------

-1-	-2-	Status	Tests	Exclude Annotation
0	1	Excluded		VC_COV_UNR
1	0	Covered	T4,T5,T6
1	1	Not Covered

 LINE       183
 EXPRESSION (((~gen_wr_req.busy)) & gen_wr_req.dst_req)
             ----------1---------   ---------2--------

-1-	-2-	Status	Tests
0	1	Covered	T7
1	0	Covered	T4,T5,T6
1	1	Covered	T1,T2,T3

 LINE       207
 EXPRESSION (dst_qs_o != dst_qs_i)
            -----------1----------

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T1,T3,T8

 LINE       228
 EXPRESSION (gen_wr_req.dst_hold_req | gen_wr_req.dst_lat_d | gen_wr_req.dst_lat_q)
             -----------1-----------   ----------2---------   ----------3---------

-1-	-2-	-3-	Status	Tests
0	0	0	Covered	T4,T5,T6
0	0	1	Covered	T1,T3,T8
0	1	0	Covered	T1,T2,T3
1	0	0	Covered	T1,T2,T3

 LINE       243
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelSwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T4,T5,T6
1	0	Covered	T1,T3,T8
1	1	Covered	T1,T2,T3

 LINE       243
 SUB-EXPRESSION (gen_wr_req.id_q == SelSwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T1,T3,T8
1	Covered	T4,T5,T6

 LINE       244
 EXPRESSION (gen_wr_req.src_req & (gen_wr_req.id_q == SelHwReq))
             ---------1--------   --------------2--------------

-1-	-2-	Status	Tests
0	1	Covered	T1,T3,T8
1	0	Covered	T1,T2,T3
1	1	Covered	T1,T3,T8

 LINE       244
 SUB-EXPRESSION (gen_wr_req.id_q == SelHwReq)
                --------------1--------------

-1-	Status	Tests
0	Covered	T4,T5,T6
1	Covered	T1,T3,T8

---

Branch Coverage for Instance : tb.dut.u_reg.u_io_div4_meas_ctrl_en_cdc.u_arb

	Line No.	Total	Covered	Percent
Branches		23	20	86.96
IF	111	2	2	100.00
IF	121	4	4	100.00
IF	139	4	4	100.00
IF	155	6	5	83.33
CASE	197	7	5	71.43

111              if (!rst_dst_ni) begin
                 -1-  
112                state_q <= StIdle;
                   ==>
113              end else begin
114                state_q <= state_d;
                   ==>

Branches:

-1-	Status	Tests
1	Covered	T4,T5,T6
0	Covered	T4,T5,T6

121              if (!rst_dst_ni) begin
                 -1-  
122                dst_req_q <= '0;
                   ==>
123              end else if (dst_req_q && dst_lat_d) begin
                          -2-  
124                // if request is held, when the transaction starts,
125                // automatically clear.
126                // dst_lat_d is safe to used here because dst_req_q, if set,
127                // always has priority over other hardware based events.
128                dst_req_q <= '0;
                   ==>
129              end else if (dst_req_i && !dst_req_q && busy) begin
                          -3-  
130                // if destination request arrives when a handshake event
131                // is already ongoing, hold on to request and send later
132                dst_req_q <= 1'b1;
                   ==>
133              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Covered	T7
0	0	1	Covered	T7
0	0	0	Covered	T4,T5,T6

139              if (!rst_dst_ni) begin
                 -1-  
140                dst_qs_o <= ResetVal;
                   ==>
141              end else if (dst_lat_d) begin
                          -2-  
142                dst_qs_o <= dst_ds_i;
                   ==>
143              end else if (dst_lat_q) begin
                          -3-  
144                dst_qs_o <= dst_qs_i;
                   ==>
145              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	Status	Tests
1	-	-	Covered	T4,T5,T6
0	1	-	Covered	T1,T2,T3
0	0	1	Covered	T1,T3,T8
0	0	0	Covered	T4,T5,T6

155              if (!rst_dst_ni) begin
                 -1-  
156                id_q <= SelSwReq;
                   ==>
157              end else if (dst_update_req && dst_update_ack) begin
                          -2-  
158                id_q <= SelSwReq;
                   ==>
159              end else if (dst_req && dst_lat_d) begin
                          -3-  
160                id_q <= SelSwReq;
                   ==>
161              end else if (!dst_req && dst_lat_d) begin
                          -4-  
162                id_q <= SelHwReq;
                   ==>
163              end else if (dst_lat_q) begin
                          -5-  
164                id_q <= SelHwReq;
                   ==>
165              end
                 MISSING_ELSE
                 ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
1	-	-	-	-	Covered	T4,T5,T6
0	1	-	-	-	Covered	T1,T2,T3
0	0	1	-	-	Covered	T1,T2,T3
0	0	0	1	-	Not Covered
0	0	0	0	1	Covered	T1,T3,T8
0	0	0	0	0	Covered	T4,T5,T6

197              unique case (state_q)
                        -1-  
198                StIdle: begin
199                  busy = '0;
200                  if (dst_req) begin
                     -2-  
201                    // there's a software issued request for change
202                    state_d = StWait;
                       ==>
203                    dst_lat_d = 1'b1;
204                  end else if (dst_update) begin
                              -3-  
205                    state_d = StWait;
                       ==>
206                    dst_lat_d = 1'b1;
207                  end else if (dst_qs_o != dst_qs_i) begin
                              -4-  
208                    // there's a direct destination update
209                    // that was blocked by an ongoing transaction
210                    state_d = StWait;
                       ==>
211                    dst_lat_q = 1'b1;
212                  end
                     MISSING_ELSE
                     ==>
213                end
214        
215                StWait: begin
216                  dst_hold_req = 1'b1;
217                  if (dst_update_ack) begin
                     -5-  
218                    state_d = StIdle;
                       ==>
219                  end
                     MISSING_ELSE
                     ==>
220                end
221        
222                default: begin
223                  state_d = StIdle;
                     ==>

Branches:

-1-	-2-	-3-	-4-	-5-	Status	Tests
StIdle	1	-	-	-	Covered	T1,T2,T3
StIdle	0	1	-	-	Not Covered
StIdle	0	0	1	-	Covered	T1,T3,T8
StIdle	0	0	0	-	Covered	T1,T2,T3
StWait	-	-	-	1	Covered	T1,T2,T3
StWait	-	-	-	0	Covered	T1,T2,T3
default	-	-	-	-	Not Covered

---

Assert Coverage for Instance : tb.dut.u_reg.u_io_div4_meas_ctrl_en_cdc.u_arb

	Total	Attempted	Percent	Succeeded/Matched	Percent
Assertions	2	2	100.00	1	50.00
Cover properties	0	0		0
Cover sequences	0	0		0
Total	2	2	100.00	1	50.00

---

Assertion Details

Name	Attempts	Real Successes	Failures	Incomplete
gen_wr_req.DstUpdateReqCheck_A	18606276	0	0	1009
gen_wr_req.HwIdSelCheck_A	18606276	533	0	0

gen_wr_req.DstUpdateReqCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	18606276	0	0	1009

gen_wr_req.HwIdSelCheck_A

Name	Attempts	Real Successes	Failures	Incomplete
Total	18606276	533	0	0
T1	7819	1	0	0
T2	3473	0	0	0
T3	13748	2	0	0
T8	0	2	0	0
T9	0	4	0	0
T10	0	3	0	0
T11	0	2	0	0
T12	0	6	0	0
T13	0	1	0	0
T14	0	1	0	0
T15	0	7	0	0
T16	2442	0	0	0
T17	20900	0	0	0
T18	267	0	0	0
T19	607	0	0	0
T20	921	0	0	0
T21	768	0	0	0
T22	617	0	0	0

Line Coverage for Instance : tb.dut.u_reg.u_io_meas_ctrl_shadowed_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	2	100.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	1	100.00
CONT_ASSIGN	284	1	1	100.00
CONT_ASSIGN	299	0	0

99                        logic dst_update;
100        unreachable    assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111                           if (!rst_dst_ni) begin
112                             state_q <= StIdle;
113                           end else begin
114                             state_q <= state_d;
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121                           if (!rst_dst_ni) begin
122                             dst_req_q <= '0;
123                           end else if (dst_req_q && dst_lat_d) begin
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128                             dst_req_q <= '0;
129                           end else if (dst_req_i && !dst_req_q && busy) begin
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132                             dst_req_q <= 1'b1;
133                           end
134                         end
135                         assign dst_req = dst_req_q | dst_req_i;
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139                           if (!rst_dst_ni) begin
140                             dst_qs_o <= ResetVal;
141                           end else if (dst_lat_d) begin
142                             dst_qs_o <= dst_ds_i;
143                           end else if (dst_lat_q) begin
144                             dst_qs_o <= dst_qs_i;
145                           end
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155                           if (!rst_dst_ni) begin
156                             id_q <= SelSwReq;
157                           end else if (dst_update_req && dst_update_ack) begin
158                             id_q <= SelSwReq;
159                           end else if (dst_req && dst_lat_d) begin
160                             id_q <= SelSwReq;
161                           end else if (!dst_req && dst_lat_d) begin
162                             id_q <= SelHwReq;
163                           end else if (dst_lat_q) begin
164                             id_q <= SelHwReq;
165                           end
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183                         assign dst_req_o = ~busy & dst_req;
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187                           state_d = state_q;
188                           dst_hold_req = '0;
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192                           dst_lat_q = '0;
193                           dst_lat_d = '0;
194                     
195                           busy = 1'b1;
196                     
197                           unique case (state_q)
198                             StIdle: begin
199                               busy = '0;
200                               if (dst_req) begin
201                                 // there's a software issued request for change
202                                 state_d = StWait;
203                                 dst_lat_d = 1'b1;
204                               end else if (dst_update) begin
205                                 state_d = StWait;
206                                 dst_lat_d = 1'b1;
207                               end else if (dst_qs_o != dst_qs_i) begin
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210                                 state_d = StWait;
211                                 dst_lat_q = 1'b1;
212                               end
213                             end
214                     
215                             StWait: begin
216                               dst_hold_req = 1'b1;
217                               if (dst_update_ack) begin
218                                 state_d = StIdle;
219                               end
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228                         assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243                         assign src_ack_o = src_req & (id_q == SelSwReq);
244                         assign src_update_o = src_req & (id_q == SelHwReq);
245                     
246                         // once hardware makes an update request, we must eventually see an update pulse
247                         `ifdef FPV_ON
248                           `ASSERT(ReqTimeout_A, $rose(id_q == SelHwReq) |-> s_eventually(src_update_o),
249                                   clk_src_i, !rst_src_ni)
250                           // TODO: #14913 check if we can add additional sim assertions.
251                         `endif
252                     
253                         `ifdef FPV_ON
254                           //VCS coverage off
255                           // pragma coverage off
256                     
257                           logic async_flag;
258                           always_ff @(posedge clk_dst_i or negedge rst_dst_ni or posedge src_update_o) begin
259                             if (!rst_dst_ni) begin
260                               async_flag <= '0;
261                             end else if (src_update_o) begin
262                               async_flag <= '0;
263                             end else if (dst_update && !dst_req_o && !busy) begin
264                               async_flag <= 1'b1;
265                             end
266                           end
267                     
268                           //VCS coverage on
269                           // pragma coverage on
270                     
271                           // once hardware makes an update request, we must eventually see an update pulse
272                           // TODO: #14913 check if we can add additional sim assertions.
273                           `ASSERT(UpdateTimeout_A, $rose(async_flag) |-> s_eventually(src_update_o),
274                                   clk_src_i, !rst_src_ni)
275                         `endif
276                     
277                       end else begin : gen_passthru
278                         // when there is no possibility of conflicting HW transactions,
279                         // we can assume that dst_qs_i will only ever take on the value
280                         // that is directly related to the transaction. As a result,
281                         // there is no need to latch further, and the end destination
282                         // can in fact be used as the holding register.
283        1/1              assign dst_qs_o = dst_qs_i;
           Tests:       T1 T2 T3 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T1 T2 T3 
285                     
286                         // since there are no hw transactions, src_update_o is always '0
287                         assign src_update_o = '0;
288                     
289                         prim_pulse_sync u_dst_to_src_ack (
290                           .clk_src_i(clk_dst_i),
291                           .rst_src_ni(rst_dst_ni),
292                           .clk_dst_i(clk_src_i),
293                           .rst_dst_ni(rst_src_ni),
294                           .src_pulse_i(dst_req_i),
295                           .dst_pulse_o(src_ack_o)
296                         );
297                     
298                         logic unused_sigs;
299        unreachable      assign unused_sigs = |{dst_ds_i, dst_update};

---

Cond Coverage for Instance : tb.dut.u_reg.u_io_meas_ctrl_shadowed_cdc.u_arb

	Total	Covered	Percent
Conditions	3	2	66.67
Logical	3	2	66.67
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

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

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

-1-	Status	Tests
0	Not Covered
1	Covered	T4,T5,T6

Line Coverage for Instance : tb.dut.u_reg.u_io_div2_meas_ctrl_shadowed_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	2	100.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	1	100.00
CONT_ASSIGN	284	1	1	100.00
CONT_ASSIGN	299	0	0

99                        logic dst_update;
100        unreachable    assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111                           if (!rst_dst_ni) begin
112                             state_q <= StIdle;
113                           end else begin
114                             state_q <= state_d;
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121                           if (!rst_dst_ni) begin
122                             dst_req_q <= '0;
123                           end else if (dst_req_q && dst_lat_d) begin
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128                             dst_req_q <= '0;
129                           end else if (dst_req_i && !dst_req_q && busy) begin
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132                             dst_req_q <= 1'b1;
133                           end
134                         end
135                         assign dst_req = dst_req_q | dst_req_i;
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139                           if (!rst_dst_ni) begin
140                             dst_qs_o <= ResetVal;
141                           end else if (dst_lat_d) begin
142                             dst_qs_o <= dst_ds_i;
143                           end else if (dst_lat_q) begin
144                             dst_qs_o <= dst_qs_i;
145                           end
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155                           if (!rst_dst_ni) begin
156                             id_q <= SelSwReq;
157                           end else if (dst_update_req && dst_update_ack) begin
158                             id_q <= SelSwReq;
159                           end else if (dst_req && dst_lat_d) begin
160                             id_q <= SelSwReq;
161                           end else if (!dst_req && dst_lat_d) begin
162                             id_q <= SelHwReq;
163                           end else if (dst_lat_q) begin
164                             id_q <= SelHwReq;
165                           end
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183                         assign dst_req_o = ~busy & dst_req;
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187                           state_d = state_q;
188                           dst_hold_req = '0;
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192                           dst_lat_q = '0;
193                           dst_lat_d = '0;
194                     
195                           busy = 1'b1;
196                     
197                           unique case (state_q)
198                             StIdle: begin
199                               busy = '0;
200                               if (dst_req) begin
201                                 // there's a software issued request for change
202                                 state_d = StWait;
203                                 dst_lat_d = 1'b1;
204                               end else if (dst_update) begin
205                                 state_d = StWait;
206                                 dst_lat_d = 1'b1;
207                               end else if (dst_qs_o != dst_qs_i) begin
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210                                 state_d = StWait;
211                                 dst_lat_q = 1'b1;
212                               end
213                             end
214                     
215                             StWait: begin
216                               dst_hold_req = 1'b1;
217                               if (dst_update_ack) begin
218                                 state_d = StIdle;
219                               end
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228                         assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243                         assign src_ack_o = src_req & (id_q == SelSwReq);
244                         assign src_update_o = src_req & (id_q == SelHwReq);
245                     
246                         // once hardware makes an update request, we must eventually see an update pulse
247                         `ifdef FPV_ON
248                           `ASSERT(ReqTimeout_A, $rose(id_q == SelHwReq) |-> s_eventually(src_update_o),
249                                   clk_src_i, !rst_src_ni)
250                           // TODO: #14913 check if we can add additional sim assertions.
251                         `endif
252                     
253                         `ifdef FPV_ON
254                           //VCS coverage off
255                           // pragma coverage off
256                     
257                           logic async_flag;
258                           always_ff @(posedge clk_dst_i or negedge rst_dst_ni or posedge src_update_o) begin
259                             if (!rst_dst_ni) begin
260                               async_flag <= '0;
261                             end else if (src_update_o) begin
262                               async_flag <= '0;
263                             end else if (dst_update && !dst_req_o && !busy) begin
264                               async_flag <= 1'b1;
265                             end
266                           end
267                     
268                           //VCS coverage on
269                           // pragma coverage on
270                     
271                           // once hardware makes an update request, we must eventually see an update pulse
272                           // TODO: #14913 check if we can add additional sim assertions.
273                           `ASSERT(UpdateTimeout_A, $rose(async_flag) |-> s_eventually(src_update_o),
274                                   clk_src_i, !rst_src_ni)
275                         `endif
276                     
277                       end else begin : gen_passthru
278                         // when there is no possibility of conflicting HW transactions,
279                         // we can assume that dst_qs_i will only ever take on the value
280                         // that is directly related to the transaction. As a result,
281                         // there is no need to latch further, and the end destination
282                         // can in fact be used as the holding register.
283        1/1              assign dst_qs_o = dst_qs_i;
           Tests:       T1 T2 T3 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T1 T2 T3 
285                     
286                         // since there are no hw transactions, src_update_o is always '0
287                         assign src_update_o = '0;
288                     
289                         prim_pulse_sync u_dst_to_src_ack (
290                           .clk_src_i(clk_dst_i),
291                           .rst_src_ni(rst_dst_ni),
292                           .clk_dst_i(clk_src_i),
293                           .rst_dst_ni(rst_src_ni),
294                           .src_pulse_i(dst_req_i),
295                           .dst_pulse_o(src_ack_o)
296                         );
297                     
298                         logic unused_sigs;
299        unreachable      assign unused_sigs = |{dst_ds_i, dst_update};

---

Cond Coverage for Instance : tb.dut.u_reg.u_io_div2_meas_ctrl_shadowed_cdc.u_arb

	Total	Covered	Percent
Conditions	3	2	66.67
Logical	3	2	66.67
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

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

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

-1-	Status	Tests
0	Not Covered
1	Covered	T4,T5,T6

Line Coverage for Instance : tb.dut.u_reg.u_io_div4_meas_ctrl_shadowed_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	2	100.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	1	100.00
CONT_ASSIGN	284	1	1	100.00
CONT_ASSIGN	299	0	0

99                        logic dst_update;
100        unreachable    assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111                           if (!rst_dst_ni) begin
112                             state_q <= StIdle;
113                           end else begin
114                             state_q <= state_d;
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121                           if (!rst_dst_ni) begin
122                             dst_req_q <= '0;
123                           end else if (dst_req_q && dst_lat_d) begin
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128                             dst_req_q <= '0;
129                           end else if (dst_req_i && !dst_req_q && busy) begin
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132                             dst_req_q <= 1'b1;
133                           end
134                         end
135                         assign dst_req = dst_req_q | dst_req_i;
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139                           if (!rst_dst_ni) begin
140                             dst_qs_o <= ResetVal;
141                           end else if (dst_lat_d) begin
142                             dst_qs_o <= dst_ds_i;
143                           end else if (dst_lat_q) begin
144                             dst_qs_o <= dst_qs_i;
145                           end
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155                           if (!rst_dst_ni) begin
156                             id_q <= SelSwReq;
157                           end else if (dst_update_req && dst_update_ack) begin
158                             id_q <= SelSwReq;
159                           end else if (dst_req && dst_lat_d) begin
160                             id_q <= SelSwReq;
161                           end else if (!dst_req && dst_lat_d) begin
162                             id_q <= SelHwReq;
163                           end else if (dst_lat_q) begin
164                             id_q <= SelHwReq;
165                           end
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183                         assign dst_req_o = ~busy & dst_req;
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187                           state_d = state_q;
188                           dst_hold_req = '0;
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192                           dst_lat_q = '0;
193                           dst_lat_d = '0;
194                     
195                           busy = 1'b1;
196                     
197                           unique case (state_q)
198                             StIdle: begin
199                               busy = '0;
200                               if (dst_req) begin
201                                 // there's a software issued request for change
202                                 state_d = StWait;
203                                 dst_lat_d = 1'b1;
204                               end else if (dst_update) begin
205                                 state_d = StWait;
206                                 dst_lat_d = 1'b1;
207                               end else if (dst_qs_o != dst_qs_i) begin
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210                                 state_d = StWait;
211                                 dst_lat_q = 1'b1;
212                               end
213                             end
214                     
215                             StWait: begin
216                               dst_hold_req = 1'b1;
217                               if (dst_update_ack) begin
218                                 state_d = StIdle;
219                               end
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228                         assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243                         assign src_ack_o = src_req & (id_q == SelSwReq);
244                         assign src_update_o = src_req & (id_q == SelHwReq);
245                     
246                         // once hardware makes an update request, we must eventually see an update pulse
247                         `ifdef FPV_ON
248                           `ASSERT(ReqTimeout_A, $rose(id_q == SelHwReq) |-> s_eventually(src_update_o),
249                                   clk_src_i, !rst_src_ni)
250                           // TODO: #14913 check if we can add additional sim assertions.
251                         `endif
252                     
253                         `ifdef FPV_ON
254                           //VCS coverage off
255                           // pragma coverage off
256                     
257                           logic async_flag;
258                           always_ff @(posedge clk_dst_i or negedge rst_dst_ni or posedge src_update_o) begin
259                             if (!rst_dst_ni) begin
260                               async_flag <= '0;
261                             end else if (src_update_o) begin
262                               async_flag <= '0;
263                             end else if (dst_update && !dst_req_o && !busy) begin
264                               async_flag <= 1'b1;
265                             end
266                           end
267                     
268                           //VCS coverage on
269                           // pragma coverage on
270                     
271                           // once hardware makes an update request, we must eventually see an update pulse
272                           // TODO: #14913 check if we can add additional sim assertions.
273                           `ASSERT(UpdateTimeout_A, $rose(async_flag) |-> s_eventually(src_update_o),
274                                   clk_src_i, !rst_src_ni)
275                         `endif
276                     
277                       end else begin : gen_passthru
278                         // when there is no possibility of conflicting HW transactions,
279                         // we can assume that dst_qs_i will only ever take on the value
280                         // that is directly related to the transaction. As a result,
281                         // there is no need to latch further, and the end destination
282                         // can in fact be used as the holding register.
283        1/1              assign dst_qs_o = dst_qs_i;
           Tests:       T1 T2 T3 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T1 T2 T3 
285                     
286                         // since there are no hw transactions, src_update_o is always '0
287                         assign src_update_o = '0;
288                     
289                         prim_pulse_sync u_dst_to_src_ack (
290                           .clk_src_i(clk_dst_i),
291                           .rst_src_ni(rst_dst_ni),
292                           .clk_dst_i(clk_src_i),
293                           .rst_dst_ni(rst_src_ni),
294                           .src_pulse_i(dst_req_i),
295                           .dst_pulse_o(src_ack_o)
296                         );
297                     
298                         logic unused_sigs;
299        unreachable      assign unused_sigs = |{dst_ds_i, dst_update};

---

Cond Coverage for Instance : tb.dut.u_reg.u_io_div4_meas_ctrl_shadowed_cdc.u_arb

	Total	Covered	Percent
Conditions	3	2	66.67
Logical	3	2	66.67
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

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

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

-1-	Status	Tests
0	Not Covered
1	Covered	T4,T5,T6

Line Coverage for Instance : tb.dut.u_reg.u_main_meas_ctrl_shadowed_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	2	100.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	1	100.00
CONT_ASSIGN	284	1	1	100.00
CONT_ASSIGN	299	0	0

99                        logic dst_update;
100        unreachable    assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111                           if (!rst_dst_ni) begin
112                             state_q <= StIdle;
113                           end else begin
114                             state_q <= state_d;
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121                           if (!rst_dst_ni) begin
122                             dst_req_q <= '0;
123                           end else if (dst_req_q && dst_lat_d) begin
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128                             dst_req_q <= '0;
129                           end else if (dst_req_i && !dst_req_q && busy) begin
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132                             dst_req_q <= 1'b1;
133                           end
134                         end
135                         assign dst_req = dst_req_q | dst_req_i;
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139                           if (!rst_dst_ni) begin
140                             dst_qs_o <= ResetVal;
141                           end else if (dst_lat_d) begin
142                             dst_qs_o <= dst_ds_i;
143                           end else if (dst_lat_q) begin
144                             dst_qs_o <= dst_qs_i;
145                           end
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155                           if (!rst_dst_ni) begin
156                             id_q <= SelSwReq;
157                           end else if (dst_update_req && dst_update_ack) begin
158                             id_q <= SelSwReq;
159                           end else if (dst_req && dst_lat_d) begin
160                             id_q <= SelSwReq;
161                           end else if (!dst_req && dst_lat_d) begin
162                             id_q <= SelHwReq;
163                           end else if (dst_lat_q) begin
164                             id_q <= SelHwReq;
165                           end
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183                         assign dst_req_o = ~busy & dst_req;
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187                           state_d = state_q;
188                           dst_hold_req = '0;
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192                           dst_lat_q = '0;
193                           dst_lat_d = '0;
194                     
195                           busy = 1'b1;
196                     
197                           unique case (state_q)
198                             StIdle: begin
199                               busy = '0;
200                               if (dst_req) begin
201                                 // there's a software issued request for change
202                                 state_d = StWait;
203                                 dst_lat_d = 1'b1;
204                               end else if (dst_update) begin
205                                 state_d = StWait;
206                                 dst_lat_d = 1'b1;
207                               end else if (dst_qs_o != dst_qs_i) begin
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210                                 state_d = StWait;
211                                 dst_lat_q = 1'b1;
212                               end
213                             end
214                     
215                             StWait: begin
216                               dst_hold_req = 1'b1;
217                               if (dst_update_ack) begin
218                                 state_d = StIdle;
219                               end
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228                         assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243                         assign src_ack_o = src_req & (id_q == SelSwReq);
244                         assign src_update_o = src_req & (id_q == SelHwReq);
245                     
246                         // once hardware makes an update request, we must eventually see an update pulse
247                         `ifdef FPV_ON
248                           `ASSERT(ReqTimeout_A, $rose(id_q == SelHwReq) |-> s_eventually(src_update_o),
249                                   clk_src_i, !rst_src_ni)
250                           // TODO: #14913 check if we can add additional sim assertions.
251                         `endif
252                     
253                         `ifdef FPV_ON
254                           //VCS coverage off
255                           // pragma coverage off
256                     
257                           logic async_flag;
258                           always_ff @(posedge clk_dst_i or negedge rst_dst_ni or posedge src_update_o) begin
259                             if (!rst_dst_ni) begin
260                               async_flag <= '0;
261                             end else if (src_update_o) begin
262                               async_flag <= '0;
263                             end else if (dst_update && !dst_req_o && !busy) begin
264                               async_flag <= 1'b1;
265                             end
266                           end
267                     
268                           //VCS coverage on
269                           // pragma coverage on
270                     
271                           // once hardware makes an update request, we must eventually see an update pulse
272                           // TODO: #14913 check if we can add additional sim assertions.
273                           `ASSERT(UpdateTimeout_A, $rose(async_flag) |-> s_eventually(src_update_o),
274                                   clk_src_i, !rst_src_ni)
275                         `endif
276                     
277                       end else begin : gen_passthru
278                         // when there is no possibility of conflicting HW transactions,
279                         // we can assume that dst_qs_i will only ever take on the value
280                         // that is directly related to the transaction. As a result,
281                         // there is no need to latch further, and the end destination
282                         // can in fact be used as the holding register.
283        1/1              assign dst_qs_o = dst_qs_i;
           Tests:       T1 T2 T3 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T1 T2 T3 
285                     
286                         // since there are no hw transactions, src_update_o is always '0
287                         assign src_update_o = '0;
288                     
289                         prim_pulse_sync u_dst_to_src_ack (
290                           .clk_src_i(clk_dst_i),
291                           .rst_src_ni(rst_dst_ni),
292                           .clk_dst_i(clk_src_i),
293                           .rst_dst_ni(rst_src_ni),
294                           .src_pulse_i(dst_req_i),
295                           .dst_pulse_o(src_ack_o)
296                         );
297                     
298                         logic unused_sigs;
299        unreachable      assign unused_sigs = |{dst_ds_i, dst_update};

---

Cond Coverage for Instance : tb.dut.u_reg.u_main_meas_ctrl_shadowed_cdc.u_arb

	Total	Covered	Percent
Conditions	3	2	66.67
Logical	3	2	66.67
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

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

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

-1-	Status	Tests
0	Not Covered
1	Covered	T4,T5,T6

Line Coverage for Instance : tb.dut.u_reg.u_usb_meas_ctrl_shadowed_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	2	100.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	1	100.00
CONT_ASSIGN	284	1	1	100.00
CONT_ASSIGN	299	0	0

99                        logic dst_update;
100        unreachable    assign dst_update = dst_update_i & (dst_qs_o != dst_ds_i);
101                     
102                       if (DstWrReq) begin : gen_wr_req
103                         logic dst_lat_q;
104                         logic dst_lat_d;
105                         logic dst_update_req;
106                         logic dst_update_ack;
107                         req_sel_e id_q;
108                     
109                         state_e state_q, state_d;
110                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
111                           if (!rst_dst_ni) begin
112                             state_q <= StIdle;
113                           end else begin
114                             state_q <= state_d;
115                           end
116                         end
117                     
118                         logic busy;
119                         logic dst_req_q, dst_req;
120                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
121                           if (!rst_dst_ni) begin
122                             dst_req_q <= '0;
123                           end else if (dst_req_q && dst_lat_d) begin
124                             // if request is held, when the transaction starts,
125                             // automatically clear.
126                             // dst_lat_d is safe to used here because dst_req_q, if set,
127                             // always has priority over other hardware based events.
128                             dst_req_q <= '0;
129                           end else if (dst_req_i && !dst_req_q && busy) begin
130                             // if destination request arrives when a handshake event
131                             // is already ongoing, hold on to request and send later
132                             dst_req_q <= 1'b1;
133                           end
134                         end
135                         assign dst_req = dst_req_q | dst_req_i;
136                     
137                         // Hold data at the beginning of a transaction
138                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
139                           if (!rst_dst_ni) begin
140                             dst_qs_o <= ResetVal;
141                           end else if (dst_lat_d) begin
142                             dst_qs_o <= dst_ds_i;
143                           end else if (dst_lat_q) begin
144                             dst_qs_o <= dst_qs_i;
145                           end
146                         end
147                     
148                         // Which type of transaction is being ack'd back?
149                         // 0 - software initiated request
150                         // 1 - hardware initiated request
151                         // The id information is used by prim_reg_cdc to disambiguate
152                         // simultaneous updates from software and hardware.
153                         // See scenario 2 case 3 for an example of how this is handled.
154                         always_ff @(posedge clk_dst_i or negedge rst_dst_ni) begin
155                           if (!rst_dst_ni) begin
156                             id_q <= SelSwReq;
157                           end else if (dst_update_req && dst_update_ack) begin
158                             id_q <= SelSwReq;
159                           end else if (dst_req && dst_lat_d) begin
160                             id_q <= SelSwReq;
161                           end else if (!dst_req && dst_lat_d) begin
162                             id_q <= SelHwReq;
163                           end else if (dst_lat_q) begin
164                             id_q <= SelHwReq;
165                           end
166                         end
167                     
168                         // if a destination update is received when the system is idle and there is no
169                         // software side request, hw update must be selected.
170                         `ASSERT(DstUpdateReqCheck_A, ##1 dst_update & !dst_req & !busy |=> id_q == SelHwReq,
171                           clk_dst_i, !rst_dst_ni)
172                     
173                         // if hw select was chosen, then it must be the case there was a destination update
174                         // indication or there was a difference between the transit register and the
175                         // latest incoming value.
176                         `ASSERT(HwIdSelCheck_A, $rose(id_q == SelHwReq) |-> $past(dst_update_i, 1) ||
177                           $past(dst_lat_q, 1),
178                           clk_dst_i, !rst_dst_ni)
179                     
180                     
181                         // send out prim_subreg request only when proceeding
182                         // with software request
183                         assign dst_req_o = ~busy & dst_req;
184                     
185                         logic dst_hold_req;
186                         always_comb begin
187                           state_d = state_q;
188                           dst_hold_req = '0;
189                     
190                           // depending on when the request is received, we
191                           // may latch d or q.
192                           dst_lat_q = '0;
193                           dst_lat_d = '0;
194                     
195                           busy = 1'b1;
196                     
197                           unique case (state_q)
198                             StIdle: begin
199                               busy = '0;
200                               if (dst_req) begin
201                                 // there's a software issued request for change
202                                 state_d = StWait;
203                                 dst_lat_d = 1'b1;
204                               end else if (dst_update) begin
205                                 state_d = StWait;
206                                 dst_lat_d = 1'b1;
207                               end else if (dst_qs_o != dst_qs_i) begin
208                                 // there's a direct destination update
209                                 // that was blocked by an ongoing transaction
210                                 state_d = StWait;
211                                 dst_lat_q = 1'b1;
212                               end
213                             end
214                     
215                             StWait: begin
216                               dst_hold_req = 1'b1;
217                               if (dst_update_ack) begin
218                                 state_d = StIdle;
219                               end
220                             end
221                     
222                             default: begin
223                               state_d = StIdle;
224                             end
225                           endcase // unique case (state_q)
226                         end // always_comb
227                     
228                         assign dst_update_req = dst_hold_req | dst_lat_d | dst_lat_q;
229                         logic src_req;
230                         prim_sync_reqack u_dst_update_sync (
231                           .clk_src_i(clk_dst_i),
232                           .rst_src_ni(rst_dst_ni),
233                           .clk_dst_i(clk_src_i),
234                           .rst_dst_ni(rst_src_ni),
235                           .req_chk_i(1'b1),
236                           .src_req_i(dst_update_req),
237                           .src_ack_o(dst_update_ack),
238                           .dst_req_o(src_req),
239                           // immediate ack
240                           .dst_ack_i(src_req)
241                         );
242                     
243                         assign src_ack_o = src_req & (id_q == SelSwReq);
244                         assign src_update_o = src_req & (id_q == SelHwReq);
245                     
246                         // once hardware makes an update request, we must eventually see an update pulse
247                         `ifdef FPV_ON
248                           `ASSERT(ReqTimeout_A, $rose(id_q == SelHwReq) |-> s_eventually(src_update_o),
249                                   clk_src_i, !rst_src_ni)
250                           // TODO: #14913 check if we can add additional sim assertions.
251                         `endif
252                     
253                         `ifdef FPV_ON
254                           //VCS coverage off
255                           // pragma coverage off
256                     
257                           logic async_flag;
258                           always_ff @(posedge clk_dst_i or negedge rst_dst_ni or posedge src_update_o) begin
259                             if (!rst_dst_ni) begin
260                               async_flag <= '0;
261                             end else if (src_update_o) begin
262                               async_flag <= '0;
263                             end else if (dst_update && !dst_req_o && !busy) begin
264                               async_flag <= 1'b1;
265                             end
266                           end
267                     
268                           //VCS coverage on
269                           // pragma coverage on
270                     
271                           // once hardware makes an update request, we must eventually see an update pulse
272                           // TODO: #14913 check if we can add additional sim assertions.
273                           `ASSERT(UpdateTimeout_A, $rose(async_flag) |-> s_eventually(src_update_o),
274                                   clk_src_i, !rst_src_ni)
275                         `endif
276                     
277                       end else begin : gen_passthru
278                         // when there is no possibility of conflicting HW transactions,
279                         // we can assume that dst_qs_i will only ever take on the value
280                         // that is directly related to the transaction. As a result,
281                         // there is no need to latch further, and the end destination
282                         // can in fact be used as the holding register.
283        1/1              assign dst_qs_o = dst_qs_i;
           Tests:       T1 T2 T3 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T1 T2 T3 
285                     
286                         // since there are no hw transactions, src_update_o is always '0
287                         assign src_update_o = '0;
288                     
289                         prim_pulse_sync u_dst_to_src_ack (
290                           .clk_src_i(clk_dst_i),
291                           .rst_src_ni(rst_dst_ni),
292                           .clk_dst_i(clk_src_i),
293                           .rst_dst_ni(rst_src_ni),
294                           .src_pulse_i(dst_req_i),
295                           .dst_pulse_o(src_ack_o)
296                         );
297                     
298                         logic unused_sigs;
299        unreachable      assign unused_sigs = |{dst_ds_i, dst_update};

---

Cond Coverage for Instance : tb.dut.u_reg.u_usb_meas_ctrl_shadowed_cdc.u_arb

	Total	Covered	Percent
Conditions	3	2	66.67
Logical	3	2	66.67
Non-Logical	0	0
Event	0	0

 LINE       100
 EXPRESSION (dst_update_i & (dst_qs_o != dst_ds_i))
             ------1-----   -----------2----------

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

 LINE       100
 SUB-EXPRESSION (dst_qs_o != dst_ds_i)
                -----------1----------

-1-	Status	Tests
0	Not Covered
1	Covered	T4,T5,T6