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发表于 2011-9-1 23:40:36
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set the cell U3 to positive_unate within clock_domain clk_240k only,
So that means, cell U3 has nonunateness as its timing sense attribute in the lib.
after set_clock_sense here, a rise of the input to U3 will cause the output of U3(which is Y) to either rise or unchanged. |
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