IBIS Macromodel Task Group

Meeting date: 17 January 2023

Members (asterisk for those attending):
Achronix Semiconductor:       Hansel Dsilva
Amazon:                       John Yan
ANSYS:                      * Curtis Clark
                            * Wei-hsing Huang
Aurora Systems:             * Dian Yang
Cadence Design Systems:     * Ambrish Varma
                              Jared James
Google:                       Hanfeng Wang
                              GaWon Kim
Intel:                      * Michael Mirmak
                            * Kinger Cai
                            * Chi-te Chen
                              Alaeddin Aydiner
Keysight Technologies:        Fangyi Rao
                              Majid Ahadi Dolatsara
                            * Ming Yan
                              Radek Biernacki
                              Rui Yang
Luminous Computing            David Banas
Marvell                       Steve Parker
Mathworks (SiSoft):         * Walter Katz
                              Mike LaBonte
Micron Technology:          * Randy Wolff
                            * Justin Butterfield
Missouri S&T                  Chulsoon Hwang
                              Yifan Ding
Rivos                         Yansheng Wang
SAE ITC                       Michael McNair
Siemens EDA (Mentor):       * Arpad Muranyi
Teraspeed Labs:             * Bob Ross
Waymo:                        Zhiping Yang
Zuken USA:                  * Lance Wang

The meeting was led by Arpad Muranyi.  Curtis Clark took the minutes.

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Opens:

- Status of regularly scheduled upcoming meetings:
  - January 24, 2023 - will be held
  - January 31, 2023 - cancelled - week of DesignCon
  - February 7, 2023 - tentatively, will be held

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Review of ARs:
  
- None.

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Call for patent disclosure:

- None.

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Review of Meeting Minutes:

Arpad asked for any comments or corrections to the minutes of the January 10th
meeting.  Michael moved to approve the minutes.  Lance seconded the motion.
There were no objections.

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New Discussion:

Standard Power Integrity Model (SPIM) BIRD draft:
Kinger reviewed the changes contained draft7, which he had sent to the ATM list.
These changes were enumerated in the email sent with draft7.  Kinger said he had
received no new feedback since sending draft7.  Arpad and Kinger asked everyone
to carefully review the draft and provide feedback.

PSIJ Sensitivity BIRD draft:
Kinger said he had received no new feedback.  Arpad suggested that Kinger create
a new draft by applying all relevant suggestions that he had received for the
SPIM BIRD.  Kinger agreed with this suggestion, and he asked everyone to focus
on the SPIM BIRD draft for now.  He said he would update the PSIJ sensitivity
BIRD draft once he had gathered all the feedback from the SPIM BIRD draft.

Multi-level analog buffer modeling (PAMn, C-phy, etc.):
Arpad noted that IBIS 7.1 supports PAM4, and IBIS 7.2 will support PAMn, but
only in the AMI context.  For conventional analog IBIS [Model]s, we lack some-
thing analogous for PAMn support.  He said one concern about trying to address
this had been that I-V, V-T, K(t) curve handling could get very complicated, and
people had been hesitant to overhaul the specification in such a profound way.
However, he noted that he had created a Verilog-A model utilizing the [External
Model] keyword for a GDDR6x presentation he and Randy had done.  Since IBIS only
considers a two-level stimulus, he had devised a scheme where the two-level
stimulus served as a clock pattern, and he read the new symbol value from a file
at each clock transition.  Randy had suggested that a minimal solution for IBIS
might be to introduce native IBIS support for a multi-level stimulus input for
multi-lingual models.  This could then be used by people willing to create PAMn
analog models using the [External Model] or [External Circuit] keywords.  Arpad
said he would think about this more and discuss it at a future meeting.

- Curtis: Motion to adjourn.
- Michael: Second.
- Arpad: Thank you all for joining.

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Next meeting: 24 January 2023 12:00pm PT
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IBIS Interconnect SPICE Wish List:

1) Simulator directives
