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timing: Fix slack for unconstrained clocks 

Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2021-09-18 10:42:52 +01:00
parent d17b5faf76
commit 287a860283
1 changed files with 7 additions and 6 deletions
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13
common/timing.cc
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@ -275,12 +275,13 @@ void TimingAnalyser::setup_port_domains()
if (launch_data.key.clock != capture_data.key.clock)
continue;
IdString clk = launch_data.key.clock;
if (!ctx->nets.count(clk))
continue;
NetInfo *clk_net = ctx->nets.at(clk).get();
if (!clk_net->clkconstr)
continue;
delay_t period = clk_net->clkconstr->period.minDelay();
delay_t period = ctx->getDelayFromNS(1.0e9 / ctx->setting<float>("target_freq"));
if (ctx->nets.count(clk)) {
NetInfo *clk_net = ctx->nets.at(clk).get();
if (clk_net->clkconstr) {
period = clk_net->clkconstr->period.minDelay();
}
}
if (launch_data.key.edge != capture_data.key.edge)
period /= 2;
dp.period = DelayPair(period);