[SI-LIST] [IBIS-Users] IBIS Questions

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 



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