Yes, these are very bad. Without knowing anything about the buffer its hard to give you any feedback. But pulldown curves should just about never have negative currents in the active region between ground and Vcc. Also, the clamps are double counted. Tom Dagostino Teraspeed(R) Labs 13610 SW Harness Lane Beaverton, OR 97008 503-430-1065 tom@teraspeed.com www.teraspeed.com Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 401-284-1827 -----Original Message----- From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On Behalf Of lau yy Sent: Tuesday, March 07, 2006 5:50 PM To: ibis-users@eda.org Subject: [IBIS-Users] FW: [IBIS] Pull Down data ---------------------------------------------------------------------------- From: "lau yy" <tok47@hotmail.com> To: ibis@eda.org Subject: [IBIS] Pull Down data Date: Tue, 07 Mar 2006 12:45:50 +0000 Hi ALL, I have some question regading the Pull Down datas. The data for my I/O pin start from 0 then decrease (become negative value), but suddenly the data turn to positive value (in mV). Anything wrong with these datas? And when I check these data by using ibischk3, I have the mismatch problem. Is this cause by the Pull Down datas? Is this a design problem or simulator problem? I do attach the IBIS model with this mail. Thanks rdgs yylau |------------------------------------------------------------------ |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 1993Received on Tue Mar 7 21:31:25 2006
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