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IBIS INTERCONNECT TASK GROUP
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Mailing list: ibis-interconnect@freelists.org 
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Attendees from March 16, 2022 Meeting (* means attended at least using audio)

ANSYS                                Curtis Clark
Intel Corp.                          Michael Mirmak*
Marvell                              Steve Parker
MathWorks                            Walter Katz*
Micron Technology                    Justin Butterfield*
                                     Randy Wolff*
Siemens EDA                          Arpad Muranyi*
ST Microelectronics                  Aurora Sanna
Teraspeed Labs                       Bob Ross*
University of Illinois               Jose Schutt-Aine
Zuken USA                            Lance Wang*


Michael Mirmak convened the meeting.  No patents were declared. 
Justin Butterfield took minutes.


Review of Minutes:
- Michael called for review of the minutes from the March 9, 2022 meeting.  
  Michael displayed the minutes.  Randy Wolff motioned to approve the 
  minutes.  Arpad Muranyi seconded.  The minutes were approved without 
  objection.


Review of ARs:
- Randy to send out the TSIRD format.
  - Done.

- Walter Katz to send out the email with the suggested port naming format 
  discussion.
  - Done. 

Opens:
- Walter would like to review his IBIS Summit presentation on Port Naming.

- Michael will not be available to host the meeting next week.  Randy 
  volunteered to host the meeting next week.


Discussion:

Port Naming:
Walter has created a presentation for the IBIS Summit on the Port Naming 
Enhancement for Touchstone Files.  He noted that port naming was the top 
request in the 2019 Touchstone survey.  The problem is the Touchstone port 
information is not sufficient and is in different formats that are not computer 
readable.  

Michael asked if the intention is to enhance Touchstone for interconnect.  
Walter added a bullet to say the enhancements are focused on Touchstone files 
used to describe interconnect.  Bob Ross noted the port naming is optional.  
Arpad asked when the port naming would be used.  Randy replied the intent is 
to make a standard format that is computer readable.  Bob noted the scope of 
the port naming is still a discussion point.

Walter noted, in the absence of a standard, EDA tools have proprietary 
formats.  The IEEE 370-2020 standard defines how ports can associate a name, 
but we would want additional information.  We would have the following 
requirements: one name for the port, an end point or location, and the 
connections for the through paths. Additionally, it is nice to know the 
differential ports.  Arpad asked about C-phy, which has more than 2 pairs of 
signals together.  He suggested to add Cord signaling ports.

Walter stated the reference information is another topic.  Bob asked what 
reference information means.  Walter noted each port has two terminals as 
defined in IEEE 370-2020, where one terminal is the signal and the other is 
the reference.  IBIS 7.1 assumes a single reference terminal for all ports of 
a Touchstone file.  Walter asked if we should optionally add a name, a 
location, and a ground net name of the port reference terminal used to make 
the Touchstone measurement.  Arpad suggested we should not limit ourselves 
based on what IBIS can currently do.  He is in favor of having one reference 
at each end of the Touchstone model.

Walter stated the goal is to add information to the Touchstone file to allow 
for automatically wrapping or connecting the model.  Walter detailed the 
different ideas the Interconnect Task Group is working on.  Michael asked 
about the context of the pin numbering and pin names.  He was concerned the 
naming is specific for chips, and the RF and IEEE 370 groups may not see the 
value of these enhancements.  Arpad commented this is a fairly application 
specific use case for the Touchstone file.

Walter gave examples of the proposed format with both physical and logical 
port names.  Arpad asked, if we don't have the physical name, would we want a 
naming convention such as using "NA".  Walter replied either the logical name 
or physical name is sufficient.  He agreed there are some details to make this 
work in the syntax.

Bob noted these additions should be optional.  Michael asked what the concern 
is.  Bob replied that all of the information may not be available.  Arpad 
commented the logical name and physical name are informational, and the parser 
cannot check these.  Walter commented the parser can check the syntax, and it 
could check the logical nature of the return loss and insertion loss for the 
connections.

Bob stated the motivation for the presentation is to get more people involved 
in the discussion.  Michael noted IEEE 370 is aware of this work, and we can 
discuss at the summit.

Walter will send out the Port Naming Enhancement for Touchstone Files slides 
[AR].


Arpad motioned to adjourn.  Randy seconded.  The meeting adjourned.


Next Meeting:
The next meeting will be March 23.


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Bin List:
1. Touchstone 3
2. Pole-residue support for Touchstone
3. ISSIRD process
4. Port naming
5. TSIRD format