platforms/sipeed_tang_nano_4k: fix period computation
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@ -91,4 +91,4 @@ class Platform(GowinPlatform):
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def do_finalize(self, fragment):
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GowinPlatform.do_finalize(self, fragment)
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self.add_period_constraint(self.lookup_request("clk27", loose=True), 1e9/100e6)
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self.add_period_constraint(self.lookup_request("clk27", loose=True), 1e9/27e6)
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