[STA] Transition time - how tools calculate this?

[ivlsi]

Hi All,

How do tools know to calculate transition time of the signals in STA and Logic Synthesis? Where do they take this info from?

Thank you!

 

[yx.yang]

For the cell library (*.lib).
Search for "transition" in the *.lib file.

 

[ivlsi]

ok, but transition time depends on the load (capacitance) as well. So, how do the tools calculate it for the different loads?

BTW, could you upload some *.lib file for example?