Hi all, I have several IBIS questions: 1. I was wondering how an IBIS simulator read and interpret the data tabulated in an IBIS file? What is the common algorithm used by most of the simulators? For example a simple driver and receiver interconnected by a transmission line. Then how do the data in pullup/pulldown/clamp/ramp play their roles in forming the simulation waveform? Can one tell what data constitute to a particular portion of the waveform? 2. Lumped RLC package is often used in IBIS models. Can they be used in higher frequency environment? Will parasitics in an IBIS file (c_comp,C_pkg,C_pin,L_pkg,L_pin) alter the output impedance as operating frequency goes higher? Is there a maximum frequency that a package model can withstand? If that is the case, is distributed package model a better choice? How do we go about it? 3. Apart from Open drain I/O, what can cause the pullup data to be zero? I generated one 3.3V pci I/O but got zero data in pullup table. Can someone shed some light here? Have a nice day. Thks & Rgds, Shee Kian Wong ------------------------------------------------------------------ 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 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