Constrain all clocks in caravel
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See the clock related tabs in this sheet: https://docs.google.com/spreadsheets/d/1imixd4qvy633XJSH527KLkDqpA50dUC4cihMyrDxYl8/edit?usp=sharing to figure out which are all the clocks.
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Set all generated clock constraints.
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Make sure there are no timing loops reported in the synthesis log.
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Make sure there are no unconstrained paths in the synthesis log.