Sujit, As mentioned by others here, the errors are due to mismatches between your V-t table settling voltages and your I-V tables. The V-t appears "settled" to stable DC voltages, so the duration of your V-t tables may not be the problem; other factors may be causing the mismatch. One concern: your [Rising Waveform] and [Falling Waveform] use different load resistances. One set uses 50 ohms, while the other uses 500. This is not a problem in itself, but the V-t tables should usually be generated into a load resistance roughly equivalent to the target system transmission line impedance. Is there a reason for using two different load resistances? The tables also only cover the cases of the pulldown transistors turning on or the pullup transistors turning on; the "turning off" cases are not covered (Rising only uses a 0V fixture, while Falling only uses Vcc as a fixture). "Turning off" cases can be valuable in simulation. Another concern, looking at the [Pulldown] table, is that it appears to "double-count" power clamp effects shown in the [POWER Clamp] table. You are also using S2IBIS2, which has since been upgraded to S2IBIS3. The updated version may address clamp double-counting and prevent this and other issues. - Michael Mirmak Intel Corp. Chair, EIA IBIS Open Forum ________________________________ From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Sujit Kumar-r65837 Sent: Thursday, January 25, 2007 05:58 To: ibis-users@server.eda.org Subject: [IBIS-Users] ibschk- warnings hi ibis experts ibschk run on an ibis generates following warnings: i have following queries: > what could be the possible reason for such warnings ? > as file is passing throgh ibschk, so can i neglect the above warnings ? pls suggest. .s2i and ibs file are attached for reference. -- thanks sujit kumar +91-120-4396069 +91-09910168788 <mailto:sujit@freescale.com> -- This message has been scanned for viruses and dangerous content by MailScanner <http://www.mailscanner.info/> , and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org |with 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 e-mail a request to ibis-request@eda-stds.org. | |IBIS reflector archives exist under: | | http://www.eda-stds.org/pub/ibis/email_archive/ Recent | http://www.eda-stds.org/pub/ibis/users_archive/ Recent | http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993Received on Thu Jan 25 08:38:39 2007
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