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THX for your help first.The method you mentioned above i have tried，but the
warning is still，and another warning happens：
Warning: Found invalid timing assignments -- see Ignored Timing Assignments report for details。
No timing path applicable to specified destination。
By the way，the signal “flg_oc_1” is a internal variable，not a IO。
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hi,
it looks like that you have a clock setting defined for this signal (?), but you defined now that it is not clock. The constraint is no longer applicable.
Honored Contributor
