Hi I am looking for the interpolation function used with NLD open-source-silicon #openroad

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Tayyeb Mahmood

04/26/2023, 3:03 AM

Hi, I am looking for the interpolation function used with NLDM in static timing analysis, will appreciate any help.

p

Philipp Gühring

04/28/2023, 9:03 AM

The formula here looks like a linear interpolation to me: https://electrotrick.wordpress.com/2018/12/31/timing-delay-models-1/

But I guess you could use more advanced interpolation/extrapolation functions as well

If you are interested in the interpolation function that is used by openlane, I think opensta does it

t

Tayyeb Mahmood

04/28/2023, 9:12 AM

Yes, openSTA uses bilinear interpolation, but I dont know whether it is a good idea, because atleast in Sky130 std cell libraries, transition times and load caps have geometric spread.

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