===============================================================================

IBIS INTERCONNECT TASK GROUP
Mailing list: ibis-interconnect@freelists.org 

================================================================================

Attendees from October 2, 2024 Meeting (* means attended at least using audio)

ANSYS                                Curtis Clark, Juliano Mologni
Arista Networks                      Jim Antonellis*
Broadcom                             James Church
Intel Corp.                          Michael Mirmak*, Xiaoning Ye
Keysight Technologies                Ming Yan
Marvell                              Steve Parker
MathWorks                            Walter Katz*
Micron Technology                    Justin Butterfield
Siemens EDA                          Weston Beal, Arpad Muranyi*, Randy Wolff*
ST Microelectronics                  Aurora Sanna
Synopsys                             Ted Mido, Edna Moreno
University of Illinois               Jose Schutt-Aine
Zuken USA                            Lance Wang

Michael Mirmak called the meeting to order.  No patents were declared.

Arpad Muranyi noted that he recommended three changes to the minutes as distributed:

1) From the original minutes:
“Arpad noted that there are several reference nodes defined in the first example, 
which cannot be connected in EMD, as it only supports "per interface referencing".”

The minutes should say something like this instead:

“Arpad noted that there are multiple reference nodes defined in the first example, 
one for each interface, which cannot be connected in EMD, as it only supports a 
single reference connection for the entire S-parameter model.”

2) From the original minutes:
“Walter Katz that added”

Michael noted that this should be "then added".

3) Should the word "references" below instead be “examples”?:
“The first 5-6 references of the text”

Arpad moved to approve the minutes with these changes.  Randy Wolff seconded. The 
minutes were approved without objection.

The team agreed that referencing would not be discussed until an EM expert could
be found to either comment on the port mapping draft or participate directly in
the meeting.

Arpad raised several individual concerns about the port mapping proposal.  One is
that the Net name on the negative side of a differential port may be needed; this
is unrelated to referencing.  Walter replied that the purpose of Net name is to 
specify which nodes are "connected".  Arpad responded that this implies use of a
unique Net name for each node in the pair, not a single net name for both.
Michael referred to the strings DQS_t and DQS_c - aren't they already separate?
Walter stated that the discussion is about reference net names; for differential 
ports, VNA measurements are never made with a probe on the high side and gnd on 
the reference side.  Differentials can be measured on a single terminal with a 
reference; some are conducted with four probing nodes (two "references", one for 
each single-ended side).  Two "ports" can form two differential pairs, four nodes 
at each end. 

Michael asked about an identifier for user-defined parameters.  In the absence of one,
should there be a separate section for such parameters. Randy suggested this could
be organized similar to AMI.

Walter replied that these are associated with ports, so no section separation would 
make sense.  He suggested the prefix "UD:" for such parameters. Arpad agreed with 
Walter's comment, noting that this information should be on independent lines.

Arpad asked whether these parameters should be on the same Port line.  Walter 
replied that these should be in-line, name-value pairs only.  
Arpad asked about multiple arguments/values.  Walter stated that each declaration
can use multiple colon characters or multiple parameter declarations.
Michael asked whether more parentheses pairs would be needed.  Walter stated that
these should be kept on a single line.

Arpad took the AR to check on Ext_Ref spelling as used for IBIS Interconnect.  He 
quickly closed this, confirming that the IBIS spelling is "Ext_ref".

For EMD both Walter and Randy agreed that only pins or nodes are needed.  Many 
different options are available.  Walter stated that he believes we can make the 
reference node a bus_label.  Randy accepted the AR to check on this. [AR]

Michael noted that the draft still needs examples after Example 8 to cover non-Port 
subparameters.

Walter noted that, for Physical parameters, the colon character is a separator.  This
identifies when is the argument is a refdes pin number vs. an xyz location.
Arpad replied that the draft does not define syntax for xyz, and the draft should 
define units as well.  Walter suggested that units be declared independently, with no 
mixing of unit declarations in the Port declarations.

Arpad asked how the proposal will distinguish between string names and names with
specific meanings.

Arpad moved to adjourn; Walter seconded.  The meeting adjourned without objection.  

The next meeting will be held October 9, 2024. 


================================================================================
Bin List:
1)	Complete port naming proposal (Katz et al) 
2)	Complete/revise Touchstone 3.0 draft outline (Mirmak) 
3)	Complete ISS-IRD 1 Draft - enable cascading of S-parameters through 
        W-element (Mirmak) - TABLED

Tabled ARs:
- Arpad to give an example of the physical connectivity needed for EMD 
automation.