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

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Attendees from August 13, 2025 Meeting (* means attended at least using audio)

ANSYS                                Curtis Clark, Wei-hsing Huang, Juliano Mologni
Arista Networks			     Jim Antonellis
Broadcom                             James Church
Chipletz			     Stephen Newberry
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*
Simberian 			     Yuriy Shlepnev
ST Microelectronics                  Aurora Sanna
Synopsys                             Ted Mido, Edna Moreno
University of Illinois               Jose Schutt-Aine

Michael Mirmak convened the meeting (shortened for this week only).  No patents were declared.  
Due to the abbreviated meeting time, review of previous minutes and ARs were deferred.

The team briefly addressed the direction of IBIS Editorial work on IBIS 8.0 and recent IBIS
Open Forum discussions.  Michael noted that there are existing Touchstone port-mapping proposal
cross-references to power integrity features.  Arpad Muranyi suggested it was safer to take out 
these references.  Randy Wolff agreed, adding that there was no definition yet in port-mapping
for stimulus, probe points, and a lot more besides.

Walter Katz separately suggested removing the list of allowed names for the "Data Usage" parameter
in the proposal.  Randy noted that a lot of these features can be added in a Touchstone 3.1.

Michael asked whether EMD or IBIS Interconnect will present problems for port-mapping given their
potential use for power integrity simulation.  Walter replied not.  These have no concept of a 
probe terminal, and no concept of stimulus.

Randy added that these do contain pin, pad, and node concepts.  Walter agreed, noting that pads
exist, and we can break up the pads into groups.  We could, for example, have three current sources 
and three bump pads for these, but they don't have to match (unlike signals).

Arpad added that he has seen buffer power and ground models connected to IBIS Interconnect structures
for power-aware simulations.  Walter replied that you would not see definitions for all 5000 bump pads.

Michael noted that Ts4file language in port-mapping had been revised, but that there were still
questions about referencing.  He took the AR to check the IBIS language for Ts4file regarding terminals, 
nodes and ports, to ensure consistency with assignment in the port-mapping proposal. [AR]

Randy suggested that there is no need to define reference for Ts4file because it's "gnd" or ideal node 0 
within IBIS.  

Walter added that he was aware of at least one implementation of a two-port Touchstone file ("Ts2file"); 
one cannot use C_comp_model in this instance.  One instead needs a series C_comp to an output, which is
yet to be defined.  He added that "group" refers to pins or pads.

Randy asked whether terminals would be included.  A group of pins or pads define a terminal.

Michael asked whether this applies only for active devices.  Arpad added that, if you have Touchstone
ports, one can group all the negative terminals into one "pin" or "pad".  

Randy advised caution: if your terminal is Vss, it's just a name.  Group is just a bunch of pads or pins.

Due to the time, Arpad moved to adjourn; Walter seconded.  The meeting adjourned without objection.