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negative delay in sdf

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yilan77

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negative delay sdf

There are some net delay is negative in sdf.
what cause negative delay happen? large transition time or large capacitance?

Could you give me some suggestion about this?

thanks!
 

shelby

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sdf negative delay

Does the SDF include SI effects? It's common for victim nets to be sped up causing negative delay in the SDF.
 

handsome

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Buffer‘s delay can be negative
 

xworld2008

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negative cell delay

The timing of delay is calaculate from before cell to next cell, if the slack of cell is large and the delay in net is small , tools will calculate error.
 

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