[ibis-macro] Minutes from the 10 Jan 2012 ibis-atm meeting
- From: Mike LaBonte <mike@xxxxxxxxxxx>
- To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
- Date: Wed, 11 Jan 2012 13:18:24 -0500
Minutes from the 10 Jan 2012 ibis-atm meeting are attached.
Mike
IBIS Macromodel Task Group
Meeting date: 10 Jan 2011
Members (asterisk for those attending):
Agilent: * Fangyi Rao
Radek Biernacki
Altera: * David Banas
Ansys: Samuel Mertens
* Dan Dvorscak
* Curtis Clark
Arrow Electronics: Ian Dodd
Cadence Design Systems: Terry Jernberg
* Ambrish Varma
* Feras Al-Hawari
Celsionix: Kellee Crisafulli
Cisco Systems: Ashwin Vasudevan
Syed Huq
Ericsson: Anders Ekholm
IBM: Greg Edlund
Intel: Michael Mirmak
LSI Logic: Wenyi Jin
Maxim Integrated Products: Mahbubul Bari
Mentor Graphics: * John Angulo
Zhen Mu
* Arpad Muranyi
Vladimir Dmitriev-Zdorov
Micron Technology: Randy Wolff
NetLogic Microsystems: Ryan Couts
Nokia-Siemens Networks: * Eckhard Lenski
QLogic Corp. * James Zhou
Sigrity: Brad Brim
Kumar Keshavan
Ken Willis
SiSoft: * Walter Katz
Todd Westerhoff
Doug Burns
* Mike LaBonte
Snowbush IP: Marcus Van Ierssel
ST Micro: Syed Sadeghi
Teraspeed Consulting Group: Scott McMorrow
* Bob Ross
TI: Casey Morrison
Alfred Chong
Vitesse Semiconductor: Eric Sweetman
Xilinx: Mustansir Fanaswalla
The meeting was lead by Arpad Muranyi
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Opens:
- Arpad: Reminder: we will not meet the week of the DesignCON summit
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Call for patent disclosure:
- None
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Review of ARs:
- Walter submit updated BIRD 123 to Open Forum
- This is 123.2
- This was emailed again today after trouble with the first email
- Arpad update analog model overview
- Done
- Arpad send updated Usage Out Fix BIRD to Mike for posting
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New Discussion:
Arpad showed the Usage Out BIRD draft:
- Arpad: No comments have been received
- Bob: There is a new line about Corner not being allowed with Usage Out
- Arpad: That was explained previously
- Bob: Note 8 should have the Corner restriction added
- Arpad: That item is not where it belongs
- Bob: It should be somewhere in that synopsis
- Arpad added the Corner restriction at item 10
- Ambrish: I did not see a notice that this was posted
- What were the changes?
- Arpad showed the changes side-by-side
- David: What is the reason for the Corner restriction?
- Arpad: The Corner selection is made in the EDA tool
- It is not appropriate for the model to declare Corner
Bob motioned to submit the Usage Out BIRD with changes to the Open Forum
- Ambrish seconded
- No one objected
- The motion was approved
AR: Arpad submit Usage Out BIRD with changes to the Open Forum
Arpad showed Walter's summary of analog model proposals:
- Walter: In the future we want to handle more than 3 corners
- It is best to not do this on IBIS with it's fixed 3 columns
- The parameter tree format is flexible enough for this purpose
- ISS is an LTI language
- We need BSS with buffer models
- Arpad: This could be used for general purpose IBIS
- Walter: That may be true
- We also have to interface with package models
- Sometimes they are assigned to groups of pins
- We need a model connection protocol with parameter passing
- In general the pins will have the same model, except for length
- Everything in the Model section can go into the tree structure
- IBIS 6.0 could be a parameter format IBIS
- C_comp could be Corner or Range
- Arpad: The tree format is not related to these technical discussions
- It could be done easily, on autopilot
- The editorial committee could do it
- Bob: The editorial committee is overloaded
- Feras: The current IBIS syntax can be extended to have more corners
- Walter: The C_comp discussions tell us how difficult that has become
- Arpad: A user defined section would allow updates any time
- Ambrish: It would be necessary to support both formats
- Walter: A conversion from old to new would be easy
- There would be some choices like whether how to convert C_comp
- It would be easier to do the analog BIRD
- Ambrish: We need the analog BIRD before IBIS 6.0
- Arpad: What in these BIRDs could not be done easily?
- Feras: The current syntax has the interfaces between parts well defined
- Bob: I would prefer this be a new standard, not IBIS
- We showed an XML version at one point
Walter showed an email describing a parameter tree interconnection format:
- Arpad: This would delay our progress
- We need the analog capabilities soon
- Walter: There are new advantages
- Portions can be in external files
- Feras: The current syntax can point to external files
- Not opposed to the new idea, but concerned about time
- Ambrish: This might take months to years to reach consensus
- Arpad: This would be more machine readable
- How ready are tool makers to throw out their existing parsers?
- Arpad: The corner limit could be solved using external files
- Walter: Many parameters can be tied to process corner
- Feras: If it can be solved in one format it can be solved in the other
- Walter: BIRDs 118 & 116 will work fine
- There should be 3 pre-defined subckts
- information could go into them automatically
- Feras: With external model we don't need new constructs
- Walter: 99% of models use Touchstone
- Short cuts to those are needed
- Feras: We should not be limited to pre-defined subckts
- Arpad: These would not limit anything
- Walter: What would be wrong with 3 intrinsic subckts?
- Fangyi: It would not be neutral
- Walter: It would work in every tool that implements the spec
- Arpad: The same Supporting_Files can be used by thousands of models
- Feras: [External Model] can do this easily
- Ambrish: We could have example circuits
- Walter: They have to be reserved so they need not be supplied
- Arpad: This would preclude having an external subckt of the same name
Meeting ended.
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Next meeting: 17 Jan 2011 12:00pm PT
Next agenda:
1) Task list item discussions
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IBIS Interconnect SPICE Wish List:
1) Simulator directives
Other related posts:
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