============================================================================== IBIS INTERCONNECT TASK GROUP Mailing list: ibis-interconnect@freelists.org ============================================================================== Attendees from December 17, 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. No patents were declared. Michael reviewed the December 10 meeting minutes. Arpad Muranyi moved to approve the minutes; Randy Wolff seconded. The minutes were approved without objection. Arpad clarified part of an earlier discussion mentioned in the minutes: Walter [Katz] stated that V1 and V2 must have the same return path; Arpad disagreed. V1(T1p, T1n) - V2(T2p, T2n) V1(T1p) - V2(T2p) Arpad requested that one cannot get to second case without assuming the "hidden" reference of 0. Michael reviewed the Port Mapping draft 23, highlighting a few outstanding technical questions. He asked whether there is any need to use * in the signal context (it is only mentioned the power and ground context). Weston Beal noted that symbol is used for multiple pins in a pin group; those could be signals. Arpad added that an intended usage example is to define one port for a rail to all the chips in a multi-chip system. One port would be routed to all chips. Michael answered that the usage is therefore not for measurement but for connectivity definition. Arpad replied by noting that it is apparently acceptable to lose accuracy with rails through combination, so why not with signals? Randy suggested that this is not a problem we need to solve; we do not need S-parameters when short-circuit definitions are needed. Michael noted that the * symbol makes pin counting ambiguous, which may make connectivity definitions also more difficult. Weston replied that port counting is what is possible with the available data. He added that writing a definition of "Ground blah (*.2)" means that *.2 refers to pins (not terminals), and "blah" is a rail inside the box. All agreed that the use of wildcards does not allow unambiguous determination of number of *pins*. Randy pointed out that wildcards are only allowed for EMD. They shortcut or define macros for reference designators. IBIS Interconnect does not support multi-die modeling today. Arpad replied that one could still check the number of refdes by counting the asterisks. Michael noted some inconsistencies on the usage of . Randy noted that Pin_name is in the EMD Pin List definition. Walter Katz added that, for Type S ports, one could refer to or Designator pin name. Randy noted that Group is essentially a Touchstone bus label. Arpad suggested that the formatting of the UD parameter and the : character usage are inconsistent. Michael replied that he will address these issues in the next draft. [AR] Arpad moved to adjourn; Walter seconded. The meeting adjourned.