Allow specifying the same clock constraint multiple times.
(As long as the clock values actually match.)
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@ -193,7 +193,12 @@ class LatticeIceStormToolchain:
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return v_output.ns
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return v_output.ns
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def add_period_constraint(self, platform, clk, period):
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def add_period_constraint(self, platform, clk, period):
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clk_ns = 1e3/period
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clk.attr.add("keep")
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clk.attr.add("keep")
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if clk in self.clocks:
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if clk in self.clocks:
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raise ValueError("A period constraint already exists")
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if clk_ns != self.clocks[clk]:
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self.clocks[clk] = 1e3/period
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raise ValueError(
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"A period constraint already exists"
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"(wanted: {:.2f}ns, got {:.2f}ns)".format(
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clk_ns, self.clocks[clk]))
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self.clocks[clk] = clk_ns
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