RE: [IBIS-Users] Query on Pullup/Pulldown

Hello Vivek,
put1.spi is the setup file for the entire driver whereas dut1.spi is the
file with the driver disabled (to get the clamp current).

The pullup current you see in the model is the difference of the 2 currents
to give the performance of only the driver.

We then take only a few points from the linear part of the curve and a
majority of points from the 'interesting' part of the curve.

That's a 100 feet view of how things are done in s2ibis2.

Hope that helps,
Ambrish.

Ambrish K Varma
akvarma@ncsu.edu
North Carolina State University
ph(919)513-2015, fax(919)515-2285

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Vivek Kumar Sundriyal
Sent: Friday, January 14, 2005 7:12 AM
To: ibis-users@eda.org; owner-ibis-users@eda.org
Subject: [IBIS-Users] Query on Pullup/Pulldown

Hi ,

      Working on s2ibis2, i find put1.spi and dut1.spi for the generation of
the
pullup data.

      Can anyone explain why do we need two sets of files for the pull up
data ?

      How does s2ibis2 extrapolate/interpolate these values into the final
.ibs
file ?

Thanks,

Vivek

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Received on Fri Jan 14 08:52:10 2005