Hi SI-Listers, I am using a DDR IO buffer that has not been designed in-house. The macro provider did provided us with an IBIS model for the Termination AND another IBIS Model for the IO itself (since there is active termination on DDR2). Since the two are connected on the same PAD at the die level, I did the same on the simulation deck. By doing so, I got nasty sim results and after investigation I realized that Package info was present on both IBIS models. As I think I am a smart engineer, I tried to decoupled the package info from the actual two IBIS models that I have, but I don't get the same results if I put the parasitic outside the IBIS vs. inside the IBIS. Anyone has a clue why? How do I get Package Parasitic outside the IBIS? Just setting RLC discrete values outside did not reproduce the same sim. Here is the Parasitic I need to separate from my Model: [Package] | variable typ min max R_pkg 0.58 0.48 0.68 L_pkg 5.80nH 4.10nH 7.50nH C_pkg 0.58pF 0.51pF 0.65pF | Thanks, Steph. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu