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Valued Contributor III
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Problem about clock skew.

I generated a inverted clock from a source clock. 

The statement is: assign clk_inv = ~clk; 

The period of the source clock is 16ns. 

The clock skew from clk to clk_inv should meet the requirements: 

1. The min value from clk's rising edge to clk_inv rising edge is 7.5ns 

2. The max value from clk's rising edge to clk_inv rising edge is 8.5ns 

Which constrain commnd should I be used? 

Thanks 

Harris
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