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TNS becomes negative at signoff?

Hi, I am using foundation flows for a deisgn. TNS remains 0 for all steps upto postroute_si. but after signoff, suddenly some extra delay is added to delay of each cell, that results in timing violations for some paths. why this extra delay is added. ?

Kari over 12 years ago

could you show part of a timing report before/after?
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