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This issue must be taken by both synth. tool and after P&R. It does not relate to back-to-back and not back-to-back placement here.laglead said:Does anyone think about the hold-time issue in back-to-back style?
If you P&R flip-flop, you should take care of this issue.
If the data-out from the first flip-flop to the second one is too fast, it will corrupt the data capture of the second flip-flop, because the second flip-flop need time to capture the data. It is the hold time.