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IBIS INTERCONNECT TASK GROUP
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Attendees from April 13, 2022 Meeting (* means attended at least using audio)

ANSYS                                Curtis Clark
Intel Corp.                          Michael Mirmak*
                                     Michael Brownell
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 30, 2022 meeting.  
  Michael displayed the minutes.  Arpad Muranyi motioned to approve the 
  minutes.  Randy Wolff seconded.  The minutes were approved without objection.


Review of ARs:
- Randy to add the EMD example issues to the IBIS 7.1 known issues document.
  - Done.

- Randy to add the Manufacturer examples to the IBIS 7.1 known issues document.
  - Done.

- Michael to send the updated TSIRD and ISSIRD templates to Randy.
  - Done.  Michael reported these were both introduced in the last Open Forum 
    meeting.


Opens:
- None.


Discussion:

Michael noted there were two pole-residue presentations and a presentation on 
port naming at the DesignCon IBIS Summit.  Michael asked, if the pole-residue 
format could have issues with the model fit,  would we need information or 
metrics about the matching.  Bob Ross stated this is out of our scope to 
determine the fitting algorithm.  Arpad suggested we could have an error 
function to give a quality metric.  

Arpad noted Vladimir prefers the pole-residue format rather than a SPICE 
netlist based on the pole-residue data.  Bob stated the main concern is the 
format of the pole-residue file, and deciding where the format goes is still an 
issue.  Arpad suggested to have the pole-residue data and the touchstone data 
in the same file.  Simulators could only look at the pole-residue data if 
needed, and there is overlap with the port naming.  Arpad stated there could 
also be cases where you might want the data in separate files.  Bob noted that 
combining the pole-residue and Touchstone data in the same file will not give a 
file size advantage.

Michael asked if the presentations from Vladimir and Jose are seen as mutually 
exclusive.  Arpad stated his understanding is that Jose's presentation is more 
about converting to SPICE circuits.  The advantage of a new pole-residue format 
is that you could make use of the data outside of a SPICE engine.  We could use 
the pole-residue format in an IBIS-AMI simulation without a SPICE engine.

Michael asked if there is any other algorithm we need to look at.  He asked if 
we need to compare the approaches from Vladimir and Jose.  Walter Katz 
commented that Jose presented on converting from pole-residue to SPICE, and he 
sees Vladimir's approach as the only solution.  Michael stated we need to 
decide a path to take some action.  Walter noted Vladimir has a format that we 
can look out.  Pole-residue format is a standard in the industry, and we only 
need to work on the details of the format.  

Randy noted it is a separate topic if IBIS-ISS supports Jose's full flow.  
Arpad noted Jose mentioned the foster element.  These use recursive 
convolution.  We do support the foster elements in IBIS-ISS.

Bob asked if the format for pole-residue is standard across tools.  Arpad 
replied that it is not, and this is what we need to decide on.  Walter 
suggested to propose a format of pole-residue and check with the EDA tool 
vendors if it can work.

Arpad suggested he can convert Vladimir's format to a keyword based format and 
start a BIRD draft [AR].  Walter noted MathWorks would be okay to use Siemens' 
format for the pole-residues.


Walter noted he sent out a new presentation on the port naming.


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


Next Meeting:
The next meeting will be April 20.


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Bin List:
1. Touchstone 3
2. Pole-residue support for Touchstone
3. Port naming