[IBIS] RE: [IBIS-Users] Question regarding V-T data of IBIS model

The easy solution is to comment out the VT tables you do not want to use.

The second easiest solution is to understand the simulator you are using.
Some SI simulators will only look at the first 4 VT tables, so reordering
the tables will solve the problem.  Other simulators will try to use all the
data so either use all or comment out what you don't want to use.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@teraspeed.com
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

  -----Original Message-----
  From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org]On Behalf Of
seshadri.kirankumar@wipro.com
  Sent: Wednesday, May 03, 2006 6:47 AM
  To: ibis-users@server.eda.org; ibis@server.eda.org
  Subject: [IBIS-Users] Question regarding V-T data of IBIS model


  Hi Experts,



          I have a doubt on IBIS modeling regarding to V-T data using a
Signal Integrity tool.

  Suppose if IBIS model contains V-T data generated for different R_fixtures
. how SI engineer is able to make the tool to use required R_fixture data
from all  V-T tables?



   As an example if I am generating V-T data(2 Risings and 2 Fallings)
against 2 Rloads i.e RLOAD1 and RLOAD2  both are less than 100 Ohms, then
s2ibis3 will put V-T will be in the below following order based on
assumption  RLOAD1 > RLOAD2



  Rising  connected VSS  using RLOAD1

  Rising  connected VDDS  using RLOAD1

  Rising  connected VSS  using RLOAD2

  Rising  connected VDSS  using RLOAD2



  Falling  connected VSS  using RLOAD1

  Falling  connected VDDS  using RLOAD1

  Falling  connected VSS  using RLOAD2

  Falling  connected VDSS  using RLOAD2



   So how a person using SI tool will chose the required V-T table data
based on RLOAD1 and RLOAD2 ? or will these be taken care automatically by
the tool?



  Thanks for providing information on this



  Best Regards

  Kiran Kumar








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