Re: clock skew
i've that book... i want to know about useful skew,local skew ,global skew and all those things..it's not given in this book
Dear Biku,
useful skew:- This is the min skew required to meet both setup and hold violations of a path.
Sometimes, what happens, when we try to meet setup with skew=0(practically 0 skew is not possible) then hold get disturbs and vice-versa. so in that case we keep some skew in between the flops to meet both setup and hold. This skew is useful skew.
Local skew:- This is the skew between two adjacent flops of the same clock path.
like between 1&2, or 2&3, or 3&4 ...............
Global skew:- This is the max skew between two flops of the same clock path.
like if max skew for the above mentioned group is between 1&4 then that is global skew.
I hope its enough..