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Warning : Fail to computer C-effective for the timing arc

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feel_on_on

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when ananotated with spef and write_sdf .
tools report lots of warning :

Warning : Fail to computer C-effective for the timing arc
PAD-->DOUT (max-rising positive_unate)
beacuse the library data indicates a non-positive drive resistance


anyone can tell me if I can ignore these warnning?
 

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