Minutes from the 3 December ibis-atm meeting are attached.
IBIS Macromodel Task Group
Meeting date: 3 December 2019
Members (asterisk for those attending):
ANSYS: Dan Dvorscak
Curtis Clark
Cadence Design Systems: Ambrish Varma
Ken Willis
Kumar Keshavan
Intel: Michael Mirmak
Keysight Technologies: Fangyi Rao
* Radek Biernacki
Ming Yan
Todd Bermensolo
Mentor, A Siemens Business: * Arpad Muranyi
Micron Technology: * Randy Wolff
* Justin Butterfield
SiSoft (Mathworks): * Walter Katz
* Mike LaBonte
SPISim: * Wei-hsing Huang
Teraspeed Labs: * Bob Ross
The meeting was led by Arpad Muranyi. Justin Butterfield took the minutes.
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Opens:
- Upcoming meeting schedule:
- Arpad proposed to cancel the meetings on December 24 and 31 for the
Holidays and
on January 28 for DesignCon.
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Review of ARs:
- Randy and Michael M. to invite DDR memory and controller vendors to comment
on new protocols.
- In progress.
- Bob to update BIRD197.6_draft_3 based on the discussion in the meeting last
week.
- Arpad reported this was done.
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Call for patent disclosure:
- None.
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Review of Meeting Minutes:
Arpad suggested to review the minutes next week to give more time to review.
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New Discussion:
Arpad reviewed that two weeks ago we planned a vote on the subject of enabling
Back
Channel Interface in statistical mode.
List of options to choose from in the vote:
1. AMI_Impulse
2. AMI_Init
3. AMI_GetWave
Arpad shared an email from Ambrish, which voted for item number 1. Arpad
suggested
we could eliminate item number 3, since Cadence had asked for this. Walter
agreed
with this. Arpad narrowed the list to options 1 and 2.
Walter noted he strongly recommends AMI_Impluse, since AMI_Init will require a
lot of
work to change the IBIS specification. Randy asked about the difference
between the
two approaches and how the memory is handled. Walter responded, if you use
AMI_Impulse, all the Tx has to do is write a BCI out string, which gets passed
to the
Rx model. The model only has to parse this BCI string. If we use the
AMI_Init, we
have to change how the branch is output. And, the Rx model will have to parse
the
entire AMI parameters. In terms of simulation efficiency, there would not be
much
difference between AMI_Impluse and AMI_Init.
Walter made a motion to vote on the options for enabling Back Channel Interface
in
statistical. Randy seconded the motion. There were no objections.
The roll call vote tally was:
Cadence - Option 1.
Mentor - Option 1.
Micron - Option 1.
SiSoft - Option 1.
SPISim - Option 1.
Teraspeed Labs - Option 1.
The roll call vote concluded with a vote tally of Option 1. â 6, Option 2.
â 0,
Abstain â 0. Option 1. was selected as the path forward.
Walter took an AR to draft a BIRD on based on the AMI_Impulse approach for this
group
to review.
BIRD197.6_draft3:
Arpad asked Bob to review the changes to BIRD197.6_draft3. Bob had made
changes to
reflect the discussion from the last meeting. Arpad asked about the sentence
Michael
had added, but he had later requested to be removed. Bob stated he had not
captured
this change. Arpad noted the latest email from Michael stated he wanted to
withdraw
his requested additional text. Bob stated it is unclear which text this
applies to.
Walter noted at the beginning of the email the text was requested, so the
comment to
withdraw the sentence was in this context. Walter suggested to delete the
sentence:
"This shall include, but is not limited to, channel effects as well as the
impact of
any equalization imposed by the transmitter." from the BIRD draft. Bob removed
this
sentence and saved the document as draft4 of BIRD197.6.
Arpad asked if there was any further discussion on BIDR197.6. Walter suggested
to
post this and plan to review and vote to submit the BIRD to the IBIS Open
Forum. Bob
suggested to vote on it today.
Walter moved to submit BIRD197.6 to the IBIS Open Forum. Randy seconded the
motion.
There were no objections.
Bob took an AR to submit BIRD197.6 to the IBIS Open Forum. Arpad suggested to
change
the red text to black text. Mike suggested the revision markup should show the
difference from the previous version (BIDR197.5), but Randy could do this if he
chooses.
BIRD181.2:
Mike suggested to give a brief review of the BIRD. BIRD181.2 is on the topic
of IV
curve clarifications. Mike noted BIRD181.2 is a draft, where he started with
IBIS
7.0 as the basis. He mentioned changes of "pin" to "terminal" and other
consistency
changes. The BIRD now covers three sections. The first change uses a spice
like
notation to express the names of the terminals that the voltage is measured
across
for [Pulldown], [Pullup], [GND Clamp], and [POWER Clamp]. Arpad asked if there
were
technical changes in BIRD181.2. Mike replied this is a clarification BIRD to
clean
up the language. The second change is to the [ISSO PD] and [ISSO PU] keywords
to use
the same spice like notation. The third change is to V(g,s) from Vgs, where
the 'g'
and 's' nodes are previously defined in the IBIS specification. The fourth
change is
also to V(g,s), but in a different section.
Mike noted he may need additional changes from "pin" to "terminal" as Walter
had
suggested. He will need to take care of making this change.
Arpad asked about the terms "pins" vs. "pads" and if we would need some changes
for
these, but this could be a separate effort. Mike agreed this would be a
separate
effort in new BIRD.
Walter asked if we can submit a version that makes these changes to IBIS 7.0.
Mike
replied he could use markup on the IBIS 7.0 text with these changes. Arpad
agreed
this could be useful in this case.
Mike took an AR to make the changes as noted to BIRD181.2 and send it out.
- Walter: Motion to adjourn.
- Randy: Second.
- Arpad: Thank you all for joining.
AR: Walter to draft a BIRD on based on the AMI_Impulse approach.
AR: Bob to submit BIRD197.6 to the IBIS Open Forum.
AR: Mike to make the changes as noted to BIRD181.2 and send it out.
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Next meeting: 10 December 2019 12:00pm PT
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IBIS Interconnect SPICE Wish List:
1) Simulator directives
