Subject: RE: [IBIS-Users] IBIS and HSPICE simulation result question
From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Thu Mar 28 2002 - 10:19:28 PST
Are you comparing waveforms observed at the same electrical point, i.e., package pin vs. die pad?
If both were observed at the package pin, are you sure the IBIS model's package parameters are correct? If there's a wide range of values, can you tell that the simulator selects the value within that range that you did in your HSPICE simulation?
What simulator did you use when checking the IBIS model? If Star-HSPICE, did you add a package model (since HSPICE's IBIS implementation doesn't include one)?
If Star-HSPICE, did you include the "optional" nd_pc and nd_gc nodes? If you don't, HSPICE turns off the clamps whenever the driver is not enabled! If you over-drive the receiver by a few volts, with a moderate source resistance, does it clamp at all?
Andy
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