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I have not used clock groups but my understanding of how they work is that it would specify that ALL signals from clock A to clock B will be excluded. I am trying to take a conservative approach where signals are excluded only by specific constraints for each signal. Clock groups would automatically exclude all signals and thus accidental domain crossings would no longer fail timing. Is my understanding of clock groups correct?
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It will exclude signals that cross domains (not all signals naturally). If your clocks are asynchronous then you need to exclude all signals that cross domains rather than select some of them.
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