Subject: RE: removing non-monotonic points?!
From: Chris Rokusek (crokusek@innoveda.com)
Date: Thu Feb 07 2002 - 09:44:52 PST
Parser-Developers,
It is true that the checker doesn't add VI curves together for the
monotonicity check but it does add VI curves together for the acdc
check. So implementation-wise all the hard work has already been done.
Just the monotonicity check itself needs to be called from within
acdc.c:acdc_CheckModelProcess() using the summed curve structures
created within that routine. Hoping this may speed the process a bit.
Chris Rokusek
Innoveda
> -----Original Message-----
> From: owner-ibis-users@eda.org
> [mailto:owner-ibis-users@eda.org] On Behalf Of Muranyi, Arpad
> Sent: Thursday, February 07, 2002 8:07 AM
> To: ibis-users@eda.org
> Subject: RE: removing non-monotonic points?!
>
>
> Prabhu,
>
> You are correct, the recommendation in that presentation will
> result in double counting the clamps. What the author of
> that paper really should have recommended is to check the
> monotonocity after summing the pullup with the power clamp
> and the pulldown with the GND clamp IV curves. Unfortunately
> the IBIS checker doesn't do this, and in my opinion it should
> be corrected. It has mislead way too many
> people already.
>
> When I brought this up in the meeting Scott's response was
> that your signals will never go into that range at the driver
> anyway, so it really doesn't matter. Even though this maybe
> true in most cases, the correct way for monotonocity check is
> after the summation.
>
> Arpad Muranyi
> Intel Corporation
> ====================================================================
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