> "My question would be: what are simulators (e.g. HSPICE) really doing with > IBIS models ... > The clamp I-V tables are always present in the simulation, and > the pullup and pulldown I-V tables are switched on/off as the > buffer is driving high/low. The end result is that the currents > of the pullup or pulldown I-V tables are added together with > the clamps. Well actually, ... Sorry to nit-pick, but in HSPICE the clamps are not necessarily always there. The end-user who puts an IBIS model in his simulation needs to make sure to include ALL the optional element nodes. If he leaves the optional nodes out, HSPICE has this nasty feature (it is really intended as a feature, not a bug) that the clamp I-V tables are omitted. Once those nodes are included in the netlist, then Arpad's statement above is correct. Regards, Andy |------------------------------------------------------------------ |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 Fri Apr 1 19:51:15 2005
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