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local skew, global skew & useful skew

Posted: Sat May 10, 2014 10:42 pm
by Netrapal
what is local skew, global skew, useful skew means?

Re: local skew, global skew & useful skew

Posted: Sun May 11, 2014 11:41 am
by Narveer
Local skew : The difference between the clock reaching at the launching flop vs the clock reaching the destination flip-flop of a timing-path.

Global skew : The difference between the earliest reaching flip-flop and latest reaching flip-flop for a same clock-domain.

Useful skew: Useful skew is a concept of delaying the capturing flip-flop clock path, this approach helps in meeting setup requirement with in the launch and
capture timing path. But the hold-requirement has to be met for the design.