Unified Coverage Report :: Module Instance :: tb.dut.top_earlgrey.u_pwm_aon.u_reg.u_pwm_param_5_cdc.u_arb

Module Instance : tb.dut.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_0_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
100.00	100.00	100.00

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
98.08	100.00	92.31			100.00	100.00	u_wkup_detector_en_0_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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_1_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
41.67	50.00	33.33

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
93.79	93.33	81.82			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
93.88	90.91	84.62			100.00	100.00	u_wkup_detector_en_1_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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_2_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
41.67	50.00	33.33

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
93.79	93.33	81.82			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
93.88	90.91	84.62			100.00	100.00	u_wkup_detector_en_2_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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_3_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
100.00	100.00	100.00

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
98.08	100.00	92.31			100.00	100.00	u_wkup_detector_en_3_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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_4_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
41.67	50.00	33.33

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
93.79	93.33	81.82			100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
93.88	90.91	84.62			100.00	100.00	u_wkup_detector_en_4_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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_5_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
100.00	100.00	100.00

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
98.08	100.00	92.31			100.00	100.00	u_wkup_detector_en_5_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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_6_cdc.u_arb

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
100.00	100.00	100.00

Instance's subtree :

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

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
98.08	100.00	92.31			100.00	100.00	u_wkup_detector_en_6_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 Instance : tb.dut.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_0_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:       T5 T26 T71 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T5 T26 T71 
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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_0_cdc.u_arb

	Total	Covered	Percent
Conditions	3	3	100.00
Logical	3	3	100.00
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	T5,T26,T71
1	0	Unreachable
1	1	Unreachable

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

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T5,T26,T71

Line Coverage for Instance : tb.dut.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_1_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	1	50.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	0	0.00
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        0/1     ==>      assign dst_qs_o = dst_qs_i;
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T178 T182 T183 
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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_1_cdc.u_arb

	Total	Covered	Percent
Conditions	3	1	33.33
Logical	3	1	33.33
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	Not Covered
1	0	Unreachable
1	1	Unreachable

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

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

Line Coverage for Instance : tb.dut.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_2_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	1	50.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	0	0.00
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        0/1     ==>      assign dst_qs_o = dst_qs_i;
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T178 T182 T183 
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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_2_cdc.u_arb

	Total	Covered	Percent
Conditions	3	1	33.33
Logical	3	1	33.33
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	Not Covered
1	0	Unreachable
1	1	Unreachable

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

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

Line Coverage for Instance : tb.dut.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_3_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:       T23 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T23 T178 T182 
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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_3_cdc.u_arb

	Total	Covered	Percent
Conditions	3	3	100.00
Logical	3	3	100.00
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	T23
1	0	Unreachable
1	1	Unreachable

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

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

Line Coverage for Instance : tb.dut.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_4_cdc.u_arb

	Line No.	Total	Covered	Percent
TOTAL		2	1	50.00
CONT_ASSIGN	100	0	0
CONT_ASSIGN	283	1	0	0.00
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        0/1     ==>      assign dst_qs_o = dst_qs_i;
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T178 T182 T183 
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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_4_cdc.u_arb

	Total	Covered	Percent
Conditions	3	1	33.33
Logical	3	1	33.33
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	Not Covered
1	0	Unreachable
1	1	Unreachable

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

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

Line Coverage for Instance : tb.dut.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_5_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:       T72 T73 T74 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T72 T73 T74 
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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_5_cdc.u_arb

	Total	Covered	Percent
Conditions	3	3	100.00
Logical	3	3	100.00
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	T72,T73,T74
1	0	Unreachable
1	1	Unreachable

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

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T72,T73,T74

Line Coverage for Instance : tb.dut.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_6_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:       T24 
284        1/1              assign dst_req_o = dst_req_i;
           Tests:       T24 T178 T182 
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.top_earlgrey.u_pinmux_aon.u_reg.u_wkup_detector_en_6_cdc.u_arb

	Total	Covered	Percent
Conditions	3	3	100.00
Logical	3	3	100.00
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	T24
1	0	Unreachable
1	1	Unreachable

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

-1-	Status	Tests
0	Covered	T1,T2,T3
1	Covered	T24