Our user project example STA is clean, but when we ran OpenSTA in Caravel, we got many hold violations as attached. We are wondering if there is a standard way to constrain user project example IOs to help with these violations? We are thinking of using slack margin in user project example , but that might not be so helpful. For the slow corner, many paths do not seem to be related to user project example.
slack margin helps a bit. We put a 1ns margin for both setup and hold. For timing typical, the WNS is about -0.11. We would still like to know a systematic constraint that we should set for user project example
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