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How does primetime trace net arcs

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identical

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I understand how the timing arcs (rise and fall) are stored in the .db file for cell timing arcs. How are the timing arcs for nets traced? I know the RC component is in .spef file. But, where does it get the delay through a net or time of flight from?
 

ThisIsNotSam

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Nets are loads, they affect the timing of the standard cells they are connected to.
 

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