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[NFC] Refine assertion to be robust to clk / rst event coincidence #33

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Merged
micprog merged 1 commit into from
Apr 15, 2026
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[NFC] Refine assertion to be robust to clk / rst event coincidence #33

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5 changes: 4 additions & 1 deletion src/multi_accept_rr_arb.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -65,10 +65,13 @@ module multi_accept_rr_arb #(
))
else $fatal(1, "Lock implies same arbiter decision in next cycle if output is not ready.");


// Trigger this *with* lock_q antecedant to avoid event queue scheduling issues
// over `posedge clk_i`.
lock_req :
assume property(
@(posedge clk_i) disable iff (!rst_ni || flush_i)
lock_d |=> inp_valid_i[idx] == req_q[idx])
lock_q |-> inp_valid_i[idx] == req_q[idx])
else $fatal(1, "It is disallowed to deassert the selected unserved request signals.");
`endif
`endif
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