Clock slew and data slew

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sjt1003

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I am having some scripts for running a physical design flow. There I am having a script where limit for clock slew and data slew is defined.

Clock slew value is 0.200 ns
Data slew value is 0.400 ns

So my query is why do we have clock slew limit lesser than the data slew limit ? Does clock buffers have any roll in this?
 

It seems like a basit nyquist criterion for data sampling, probably to avoid data sampling before clock slew is satisfied.

What is your specifications?
 

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