Negative delay in Primetime

[ruanwang]

Hi everyone,

I have a question about negative cell delay in pt. Could you show mw where does the negative delay come from?

BR.

 

[ads-ee]

Hi everyone,

I have a question about negative cell delay in pt. Could you show mw where does the negative delay come from?

BR.

WOW get me some of those gates! I'd sure like to get a cell library that has negative gate delays, that would be awesome to have a design that finishes calculations before the data or the clocks arrive! :thumbsup:

I have an feeling I know what you are asking, but your question is vague and can not be answered as stated.

 

[ruanwang]

Don't get me wrong ads..
I mean when I analyze timing report from pt, some cells/nets have a negative delay in the report.
But I dont know where they come from. Maybe the threshold slew of output pin is smaller than input pin.