Difference in Delays of the same cells in best run and worst run

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Stichi_1985

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Hi All,

I have a path when timed in the best run has nominal cell delays of the Buffers but when timed in worst run the same Buffers have huge delays and driving a very long distance. This is at prects stage and its a low power design

Worst run slack :- -2911 ps
Best run slack :- -199 ps

What could be the reason for this difference in delays?


Thanks !!
 

Hi,

maybe there is a clock involved ..about 350MHz?

Klaus
 

This is a huge difference that would suggest something is wrong. Post the entire path with the delays of all elements and maybe the reason will become evident.
 

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