Subject: Re: [IBIS-Users] Query on the IBIS file verification
From: Robert Haller (rhaller@sisoft.com)
Date: Thu Jan 08 2004 - 06:09:07 PST
Radhika and Michael
There are also ibis parser bugs that can trigger this error
i.e.parser BUG81
regards
Bob
-- Robert J. Haller (rhaller@sisoft.com) Principal Consultant Signal Integrity Software Inc. 6 Clock Tower Place, Suite 250 Maynard, MA 01754 Phone: (978) 461-0449, ext 15Michael Sachtjen wrote: > Typically when I seen these warnings it is either > becuase I did not run the V-T simulations long enough > for the transition to complete or I didn't capture > enough I-V points in the transition regions. Since > the larger error on both your rising and falling > tables occur on the VDD side, I would suspect the > later. Are your I-V points equally spaced or are you > choosing the "best 100" to represent the curve? > > > --- radhika.guttal@wipro.com wrote: > >>2. In one of the I/O buffer IBIS model transient >>analysis, the ouput >>waveform does not match the model's V-T table. I am >>using the same setup >>(same Rload with same termination and same input >>signal used to generate >>the IBIS model) for the analysis. I am not able to >>figure out the >>mismatch. When I run ibischk3 on the IBIS model I am >>getting the >>following warnings which I am not able to eleminate >>: >> >>a. The [Rising Waveform] with [R_fixture]=50 Ohms >>and >>[V_fixture_max]=1.6V has MAX column DC endpoints of >>0.76V and 1.59V,but >>an equivalent load applied to the model's I-V tables >>yields different >>voltages(0.76V and 1.57V), a difference of 0.21% and >>2.22%,respectively. >> >> >>b. The [Falling Waveform] with [R_fixture]=50 Ohms >>and >>[V_fixture_max]=1.6V has MAX column DC endpoints of >>0.76V and 1.59V,but >>an equivalent load applied to the model's I-V tables >>yields different >>voltages(0.76V and 1.57V), a difference of 0.21% and >>2.22%,respectively. >> >>If anybody has faced the same problem or has some >>solution for the above >>issues please guide me in this regards, >> >>Radhika V Guttal > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes > http://hotjobs.sweepstakes.yahoo.com/signingbonus > |------------------------------------------------------------------ > |For help or to subscribe/unsubscribe, email majordomo@eda.org > |with just the appropriate command message(s) in the body: > | > | help > | subscribe ibis <optional e-mail address, if different> > | subscribe ibis-users <optional e-mail address, if different> > | unsubscribe ibis <optional e-mail address, if different> > | unsubscribe ibis-users <optional e-mail address, if different> > | > |or email a written request to ibis-request@eda.org. > | > |IBIS reflector archives exist under: > | > | http://www.eda.org/pub/ibis/email_archive/ Recent > | http://www.eda.org/pub/ibis/users_archive/ Recent > | http://www.eda.org/pub/ibis/email/ E-mail since 1993
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