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IBIS INTERCONNECT MODELING AD HOC TASK GROUP MEETING MINUTES
Meeting Date: May 2, 2007
(minutes revised with corrections Jan. 22, 2008)

http://www.eda.org/ibis/adhoc/interconnect/

Mailing list: ibis-interconn@freelists.org

Attendees:
----------
(* denotes present)
Agilent                    - Radek Biernacki*, John Moore
Ansoft                     - Michael Slavkin*
Green Streak Programs      - Lynne Green*
Intel                      - Michael Mirmak*
Mentor Graphics Corp.      - John Angulo*
Micron Technology          - Randy Wolff*
Sigrity                    - Sam Chitwood*
Teraspeed Consulting Group - Bob Ross* 

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Next Meeting:
Wednesday, May 23, 2007

               Telephone     Bridge   Passcode
              916-356-2663     1      656-7566


LiveMeeting Details - NOTE: USE THE DETAILS BELOW ONLY IF THE OUTLOOK
  INVITATION LINKS FAIL

If you need to be added to the LiveMeeting, contact Michael Mirmak

  Subject: IBIS Ad Hoc Interconnect Meeting
  Meeting URL: https://www.livemeeting.com/cc/intel/join
  Meeting ID: 543NF4
  Meeting Key: 6kHp<W:+G

Agenda:
- Review of Touchstone(R)2 draft 6 (final review?)
- Updated Example of S-parameter Shorting under IIRD9

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The team reviewed the latest version of the Touchstone2 draft.
Additional editorial adjustments were proposed by Radek:

- the equation showing how to calculate the number of data points based
  on ports should be 2n^2+1, without parentheses
- on page 14, the phrase "S-parameters" should be properly capitalized
- for noise parameter x2, the phrase "a magnitude" should be removed
- for noise parameters x3 and x4 should be noted as a complex number pair,
  with both calculated with respect to a reference; both are in magnitude-
  angle format

Lynne Green suggested that the text for x5 should mention a physical limit.

The next version will feature a completely new format similar to that used 
for other industry standards.

The IIRD9 shorting example was reviewed and significant debate ensued
regarding whether the specification should encourage potentially
inaccurate reduced (shorted) representations of real devices.  Both IBIS and ICM
were intended for use in layout-style simulation tools where complete pin
lists mapped to package footprints were provided.  However, this may now be
the exception rather than the rule.  The team did agree that any shorting
example not be part of IIRD9 but a separate addition to the specification, 
with warnings about potential problems. 

ARs
-----
Sam     - provide a simple drawing of "virtual reference" case
Michael - update IIRD9 draft with changes for final review next time - DONE
          (add additional drawings and examples)

Team Objectives:
1) complete ICM-IBIS linking BIRD and any associated changes to the 
   ICM specification
2) update the ICM specification, if needed, to clarify the mapping of 
   ICM nodes to S-parameter ports
3) complete a specification for "Touchstone Plus" or similar 
   industry-standard definition for Touchstone-like files, to include 
   complex impedance references, removal of limits on the maximum number
   of ports and per-port impedance references