RE: [IBIS] Usage of multiple V-T curves in IBIS

Muniswar,
 
This could be handled several different ways, but not
too many IBIS tool vendors have implemented support 
for multiple V-t tables.  Even if they do, they do not
advertise how they do it because it is considered a
secret sauce.  You can check one idea Luca Giacotto
played with in this presentation (pg. 15 onwards):
 
http://www.vhdl.org/pub/ibis/summits/jun03b/muranyi1.pdf
 
Arpad
=======================================================

________________________________

From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On
Behalf Of Muniswara Reddy Vorugu
Sent: Monday, August 11, 2008 7:41 AM
To: ibis-users@server.eda.org; ibis@server.eda.org
Subject: [IBIS] Usage of multiple V-T curves in IBIS



Hi, 

If there are multiple V-T tables

  1: Are all multiple tables used at a time? 

      We have two variables (kpu & kpd) and more than 2 equations, So We
get either multiple or NO solution. 

      How is this situation handled?

 

  2: If a particular pair of tables are used,

      What is the criterion on which the particular pair is chosen from
multiple tables?

      Is this criterion simulator dependent, or there is a standard.

 

Thanks,

Muniswar

 

________________________________

From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of
Sudarshan H N
Sent: Monday, August 04, 2008 1:34 PM
To: ibis-users@eda.org; ibis@eda.org
Subject: [IBIS] Usage of V-T curves

 

Hi,

Can somebody explain me the usage of V-T curves in IBIS simulations at
the board level. While generating V-T curves we assume some resistive
load (say 50ohm) and give the rising and falling waveforms. But the
actual board might see the different RLC values . How does the tool
interpolate or extrapolate these curves to get the exact waveforms at
the driver output for the given load with just one table of V-T curves.
?

Regards
Sudarshan


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