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async2sync: turn FFs with const clks into gclk FFs with feedback

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The formal backends do not support multiple clocks. This includes
constant clocks. Constant clocks do appear in what isn't a proper
multiclock design, for example when mapping not fully initialized ROMs.
As converting FFs with constant clocks to FFs using the global is doable
even in a single clock flow, make async2sync do this.
This commit is contained in:
Jannis Harder 2022-06-29 17:53:58 +02:00
parent b80976b543
commit 5db542742b
1 changed files with 3 additions and 0 deletions
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3
passes/sat/async2sync.cc
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@ -75,6 +75,9 @@ struct Async2syncPass : public Pass {
if (ff.has_gclk) if (ff.has_gclk)
continue; continue;
if (ff.has_clk && ff.sig_clk.is_fully_const())
ff.has_ce = ff.has_clk = ff.has_srst = false;
if (ff.has_clk) if (ff.has_clk)
{ {
if (ff.has_sr) { if (ff.has_sr) {