RE: [IBIS-Users] Power and Ground Clamp data in pullup/pulldown curves

If your buffer is an input or an output with an enable, the power and ground clamps will be created.  When generating the Pullup/Pulldown curves, s2ibis will generate two of them IF you have an enable pin.  The "extra" sweep is performed with the driver disabled, i.e. like power/gnd clamp, and then this is subtracted from the original pulldown/pullup curve (which are created with the output enabled).

So if you have an enable and use it properly, s2ibis will not include the power/gnd clamp data in the pullup/pulldown curves, since it gets subtracted out.  If you look at the output files, you should see 12 pullup/pulldown curves in total.  6 pullup/pulldown curves with output enabled, and 6 with output disabled.   

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
Behalf Of Rick Kingen
Sent: Thursday, April 28, 2005 11:13 AM
To: ibis-users; ibis
Subject: [IBIS-Users] Power and Ground Clamp data in pullup/pulldown
curves


Hello IBIS users,

Can anyone tell me of a way to generate an ibis model from S2ibis2 that does
not include the Power and Ground clamp data in the pullup/pulldown curves?
Is there a switch or something in S2ibis2 that I am missing?

Thanks in advance.

Regards,

Rick Kingen


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