Enclosed please find the minutes of the IBIS Editorial Task Group Meeting for
March 24, 2017. Comments and suggestions are welcome.
- MM
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IBIS EDITORIAL TASK GROUP
http://www.ibis.org/Editorial_wip/ ;
Mailing list: ibis-editorial@xxxxxxxxxxxxx
Archives at //www.freelists.org/archive/ibis-editorial/ ;
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Attendees from March 24 Meeting (* means attended at least using audio)
ANSYS Curtis Clark
Intel Corp. Michael Mirmak*
Keysight Technologies Radek Biernacki*, Ming Yan
Mentor Graphics Arpad Muranyi*
Micron Technology Justin Butterfield, Randy Wolff*
Signal Integrity Software Walter Katz*, Mike LaBonte*
Teraspeed Labs Bob Ross*
Michael Mirmak convened the meeting. No patents were declared.
Mike LaBonte moved to approve the minutes of the March 17 meeting. Bob Ross
seconded the motion. The minutes were approved without objections.
During the AR review, Michael noted that he has yet to send the curve-tracing
measurement drawings to the reflector.
Mike & Bob continue to work together to resolve language in BIRD181 and
referencing text; this is addressed in a presentation to be discussed later in
the meeting.
Walter Katz has fulfilled his AR to send out his own proposals for new language
on referencing.
Mike continues work to adjust the text surrounding his new IBIS 6.2 figures,
separately from his BIRD181.1 work. Mike added that the requirement section of
the BIRD is done; the document still needs adjustments to the figures and text,
which can be reviewed in the next meeting.
Mike checked on the submission date for BIRD 181.1 (currently listed as Oct.
2016). The BIRD on-line has dates for 181, which were off by a few days each.
All dates on-line are correct now. Work on a draft BIRD 181.2 is in progress.
Bob presented material summarizing issues with BIRD 181.1. He suggests that
the nature of the changes is such that the Open Forum could delay the changes
until later and leave IBIS as-written. He also discussed several issues aside
from BIRD181.x that need resolution.
On referencing, terminals are used in many cases for referencing that are
usually intended to be at the buffer.
For I-V tables, the equations in the original specification were only to
intended to describe polarity conversion of the table data, not referencing per
se.
Michael asked whether the new full equation approach is less intuitive. Bob
suggested that it was.
Radek Biernacki agreed with Bob's proposed changes in "Other Notes" portion of
IBIS, adding that current needs to be defined there. Bob noted that current
conventions defined elsewhere in the document need to be re-checked. Bob also
noted that the typ/min/max combinations in the equation need to be taken into
account.
Simiarly, typ/min/max varitions are needed in [ISSO P*] figures and defintions.
There is a discrepancy regarding the figure (which shows typ/min/max) and the
text (which suggests typical-only). The team should consult older
documentation and presentations on the ISSO keywords to see original definitons.
Bob added that in the I-V section, there are too many references in the table
Range definitions to CMOS as opposed to other technolgies.
Bob suggested that moving the Notes on Data Derivation material to the I-V
section is workable, but may have other impacts. He added that the Table of
I-V Table Ranges for Low and High Voltages needs clarification. Radek noted
that the table is in the context of the pullup and pulldown, not the table
reference.
Bob concluded by stating that all of these changes are required in order to
adopt nodal terminology consistently throughout IBIS.
Michael asked whether a nodal approach is what we want to do; IBIS does not
necessarily require use of SPICE syntax.
Walter stated that IBIS should indeed be consistent with SPICE syntax. He
suggested avoiding writing a BIRD, as a complete document with edits can be
generated and submitted more easily, but will defer. Bob advocated writing at
least one BIRD to address the issues clearly. Walter suggested that Bob write
the BIRDs.
Michael asked whether the number of BIRDs is tractable. Bob replied that at
least 4 more BIRDs would be needed, complicating decisions about IBIS versions.
Bob added that another option would be to approve BIRD 181 as-is, then leave
the rest of IBIS as-is, to be edited later.
Mike summarized the recent history, observing that BIRD181 fixed table issues,
but then nodes, voltage values, etc. were noted to be inconsistent in their
treatment elsewhere. Then Bob realized that Notes on Data Derivation is also
inconsistent and needs to be fixed. Total consistency would require a very
large update. According to Mike, Walter had suggested that IBIS 6.2 was
intended to do this.
Mike suggested that the I-V table section and Notes on Data Derivation section
remain in BIRD181. Mike's figures BIRD would be completely separate and is
intended to show full circuits with clean terminology. Mike agreed with Bob
that we need to "show our work" in a BIRD or BIRDs that document the rationale
for any changes.
Walter moved to adjourn. Bob seconded the motion. The meeting adjourned
without objection.
