
IBIS Macromodel Task Group

Meeting date: 12 June 2012

Members (asterisk for those attending):
Agilent:                      Fangyi Rao
                              Radek Biernacki
Altera:                       David Banas
Andrew Joy Consulting:        Andy Joy
Ansys:                        Samuel Mertens
                            * Dan Dvorscak
                              Curtis Clark
			    * Luis Armenta
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:

- Walter: We could discuss on-die power distribution

- Walter: We could discuss parameter trees too

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Call for patent disclosure:

- None

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Review of ARs:

- Arpad and Walter find Dependency Table control method not using Labels
  - Should have a revised BIRD 150 by next week

- Bob propose method for parameter passing
  - No report

- Arpad revise BIRD 117 and 118 to generalize parameter file references
  - In progress

- Ambrish update BIRD 145 for pad to pin mapping and other clarifications
  - This is tabled, waiting for the outcome of other issues

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New Discussion:

Luis Armenta joins for the first time:
- Joined ANSYS 3 or 4 weeks ago
- Senior product manager
- Responsible for IBIS AMI models
- New to AMI

Parameter Tree keyword BIRD draft:
- Arpad:
  - Removed Model_Specific from example
  - Added context specific tree rules
- Arpad showed the BIRD draft
- Arpad:
  - A sentence from other BIRDs has been moved here
    - Clarifies that Model_SPecific and Resreved_Parameters are not required
  - Clarification of In and Info has been added
- Walter: It might help to say parameters are passed "to the ISS instance"
- Arpad: That was taken out because it is the [External Circuit] Parameters keyword
  that gives the parameters
- Walter: Brad Brim proposed MCP (Model Connection Protocol)
  - That concept could be included in ISS
- Arpad: That would be an ISS change
- Walter: They would be comments in ISS, follwing an asterisk
- Arpad: I would prefer to tackle one thing at a time
- Arpad added some missing right parens to the draft
- Arpad: We should all review this
  - There may be a vote next week to submit to Open Forum

BIRD 117.4:
- Arpad showed BIRD 117.4 draft 5 and explained the latest changes
- Arpad: Not sure how the "virtual file" feature would work
- Walter: The IBIS file might be contained within an EBD
  - Similarly we might have text files within IBIS
- Arpad: We should continue with the current proposal as is
- Walter: Next week we should discuss IBIS 5.1 status
  - Also we should not submit BIRDs that are not in 5.1 format
- Arpad: This one was submitted two years ago

BIRD 118.3:
- Arpad: We should all review this and maybe vote next week

BIRD 150:
- Arpad: There will be a new version next week

BIRD 116 and BIRD 122:
- Walter: We can submit BIRD 116 after more review
  - BIRD 122 can be withdrawn
    - It can be an exemplar for BIRD 116
- Arpad: We will consider BIRD 122 tabled for our purposes

BIRD 125:
- Arpad: It has been a while, rereading is needed
- Walter: Today's packages can have 500 power and ground pins
  - There can be 100 silicon ground/power bumps connecting to 20 package pins
  - The question is which frequencies we are concerned about at the buffer
  - At 10GHz or slower we don't need to know the details
  - Above that we need to know the distributed on-die model
  - We should anticipate what the needs will be when the spec comes out
  - For signal pins one-to-one correspondence is normal
  - For power/ground we have to consider many-to-one
- Arpad: Even signals can have more complex connections
- Walter: EBD can handle that
- Arpad: EBD is for boards, not packages
- Walter: We might need a [Pads] section in IBIS for on-die power
  - It would not have to be physical
- Arpad: ISS could have subckts for on-die modeling
  - Cadence has a BIRD for that
- Walter: We should have a model that connects buffer nodes and pad nodes
  - Also a separate model that connects pin nodes to pad nodes
  - They are independent models, not chained
- Arpad: We should have a block diagram for this
- Walter: This can be described in terms of "bed spring" models
  - The separation helps because different people develop each part
- Arpad: We will have to differentiate between reserved nodes and declared nodes

AR: Walter create block diagram for buffer/pad/pin node connection concept

Arpad: Can we take the new Naming RUles BIRD draft off the agenda?
- Walter: That's OK

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Next meeting: 19 June 2012 12:00pm PT

Next agenda:
1) Task list item discussions

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IBIS Interconnect SPICE Wish List:

1) Simulator directives
