Minutes from the 29 November ibis-atm meeting are attached.
The following document, which was discussed during the meeting, has been
posted to the work archive.
*DATE* AUTHOR <http://ibis.org/macromodel_wip/archive-author.html>
ORGANIZATION <http://ibis.org/macromodel_wip/archive-org.html> TITLE
<http://ibis.org/macromodel_wip/archive-title.html> FORMATS
29-NOV-2016 Michael Mirmak Intel Corporation Rx Deterministic Noise Support
for AMI BIRD draft 3 (zip
<http://ibis.org/macromodel_wip/archive/20161129/michaelmirmak/Rx_Deterministic_Noise_Support_for_AMI_BIRD_draft_3.zip>
)(docx
<http://ibis.org/macromodel_wip/archive/20161129/michaelmirmak/Rx%20Deterministic%20Noise%20Support%20for%20AMI%20BIRD%20draft%203/RX-deterministic-noise-draft3.docx>
)
IBIS Macromodel Task Group
Meeting date: 29 November 2016
Members (asterisk for those attending):
ANSYS: * Dan Dvorscak
* Curtis Clark
Broadcom (Avago): Xingdong Dai
* Bob Miller
Cadence Design Systems: * Ambrish Varma
Brad Brim
Kumar Keshavan
Ken Willis
Cisco: Seungyong (Brian) Baek
eASIC: David Banas
Marc Kowalski
Ericsson: Anders Ekholm
GlobalFoundries: Steve Parker
IBM Luis Armenta
Trevor Timpane
Intel: * Michael Mirmak
Keysight Technologies: Fangyi Rao
* Radek Biernacki
* Ming Yan
Maxim Integrated Products: Hassan Rafat
Mentor Graphics: John Angulo
* Arpad Muranyi
Micron Technology: * Randy Wolff
Justin Butterfield
QLogic Corp.: James Zhou
Andy Joy
SiSoft: * Walter Katz
Todd Westerhoff
* Mike LaBonte
Synopsys: Rita Horner
Kevin Li
Teraspeed Consulting Group: Scott McMorrow
Teraspeed Labs: * Bob Ross
TI: Alfred Chong
The meeting was led by Arpad Muranyi.
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Opens:
- Arpad noted that regularly scheduled meetings in December would occur on the
6th, 13th, 20th, and 27th. Arpad noted that we typically cancel the IBIS
meeting that occurs in the last week of December. The meeting on December
27th is cancelled (official motion appears in the minutes below).
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Review of ARs:
- Walter to create draft 5 of the file name relaxation proposal and send it to
the ATM list.
- Done. Posted to the work archives.
- Bob M. to update BIRD 147.4 draft to include discussed changes to BCI_ID.
- Done. New version sent out prior to this meeting.
- Michael M. to incorporate discussed changes into the Format and Usage Out
Clarifications BIRD draft.
- Done. Posted to the work archives.
- Michael M. to incorporate discussed changes into the Deterministic Noise
Support BIRD draft.
- Done. Posted to the work archives.
--------------------------
Call for patent disclosure:
- None.
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Review of Meeting Minutes:
- Arpad: Does anyone have any comments or corrections? [none]
- Radek: Motion to approve the minutes.
- Bob M.: Second.
- Arpad: Anyone opposed? [none]
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New Discussion:
BIRD 147.4 draft 4, update to include changes to BCI_ID.
- Bob M.: [sharing draft4 from his recent email]
- Discussion: Bob M. reviewed changes to the language of the BCI_ID section.
The section now refers to Section 3, item 3 of the spec. so it can inherit any
changes from the file name rule relaxation proposal. The language explains
how the BCI_ID value set by the EDA tool differs from a file name as defined
in Section 3. The language clarifies that the complete filenames created by
the model from the BCI_ID shall conform to Section 3, item 3. The language
introduces the concept of a "namespace" as what the BCI_ID value set by the
EDA tool defines. It introduces the terminology "namespace set" to illustrate
the point that two models on the same channel (say Tx and Rx) may have
different values set in their BCI_ID by the EDA tool. If the models' working
directories are different, different BCI_ID values would be required to point
each of them to a common location. The group reviewed the language regarding
path-like quantities and file names, and editorial suggestions were discussed.
Bob M. modified the proposal as the group reviewed it. The group discussed
the paragraph that described what an end user might do if the EDA tool did not
modify BCI_ID. It was viewed as unnecessarily describing a workaround for a
tool that did not support BCI_ID. Radek also pointed out that it suggested
the end user modify the .ami file, which we usually don't recommend. The
paragraph was removed entirely. Bob R. asked that Bob M. issue the modified
version as draft 5 of BIRD 147.4. Bob M. agreed to do so.
- Bob M.: Motion to submit BIRD 147.4 to the Open Forum (draft 5).
- Bob R.: Second. [no one opposed]
Relaxation of IBIS filename restrictions:
- Walter: [sharing draft 5 of the proposal]
- I modified some language based on last meeting:
- "../" is not permitted, except that it is permitted if generated by the EDA
tool.
- "/" is not permitted at the beginning of a file name, except that it is
permitted if generated by the EDA tool.
- We want to make sure model makers understand the format of what they make
and put in IBIS files, and that the EDA tool can insert something different
if necessary.
- File names in IBIS files have one set of rules.
- Exceptions are noted for the things the EDA tool may generate.
- I changed the language in item 3 to say that a file name may NOT be a
directory.
- I added a sentence to say, "Directory (path) names follow the same rules
as filenames, except that they shall be the name of a directory."
- Previously we only had defined rules for file names.
- Now we say paths follow the same rules as file names.
- Bob M.: If you have a directory name, should we require it to end in a
directory delimeter?
- Walter: I thought that would make sense, too.
- However, the AMI Supporting_Files parameter's description explicitly
prohibits the delimeter from appearing at the end of the string.
- Discussion: Bob R. expressed some concern over the language "except that it
is permitted if generated by the EDA tool." He felt it might have hidden
implications and might not be clear enough. Radek noted that the description
was still somewhat incomplete, as there was no provision to provide a drive
letter (e.g. C:) as might be seen in Windows. He suggested we might just
refer to absolute or relative paths for the operating system, and that the
only thing we might insist upon is that "/" is the directory separator and not
"\". Walter modified the proposal as the group discussed and came to
agreement on revised language (creating draft 6).
- Bob R.: Motion to submit this to the IBIS Open forum as modified (draft 6).
- Bob M.: Second. [no one opposed]
Rx Deterministic Noise Support in AMI:
- Michael M.: [sharing draft 2]
- The only change made in this revision was to rename the parameters from
Rx_Dn and Rx_Rn (Rx_Noise) to Rx_BoundedUniform and Rx_Gaussian (Rx_Noise).
- Walter: My only problem with the new names is that they don't make it clear
whether it's noise or jitter.
- Perhaps we could add "Noise" to the end?
- For jitter you often see BUJ (bounded uniform jitter).
- Discussion: Michael M. proposed simply adding "Noise" at the ends of the
new parameter names (Rx_BoundedUniformNoise, Rx_GaussianNoise). Bob R. noted
his preference for using "_" between words, unless a convention already
existed. Michael M. noted that he had reviewed other AMI parameter names,
including the PAM4 parameters, and had only seen that "_" was always used to
separate Tx and Rx from the following words. To be entirely consistent for
the new parameter names, Michael asked if we should add "Unbounded" to the
Gaussian noise parameter name (Rx_UnboundedGaussianNoise). Radek, Curtis
and others noted that unbounded was implicit in Gaussian, and bounded was
implicit in uniform, but no one objected to the proposed explicit names.
Michael agreed to send out a draft 3 containing the name changes.
Meeting on December 27th:
- Arpad: Motion to cancel the meeting on December 27th.
- Curtis: Second. [no one opposed]
- Arpad: Thank you all for joining.
AR: Bob M. to submit BIRD 147.4 draft 5 to the IBIS Open Forum as BIRD 147.4.
AR: Walter to put draft 6 of the file name relaxation proposal into BIRD format
and submit it to the IBIS Open Forum.
AR: Michael M. to incorporate discussed changes into the Deterministic Noise
Support BIRD draft and send out draft 3.
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Next meeting: 06 December 2016 12:00pm PT
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IBIS Interconnect SPICE Wish List:
1) Simulator directives
