[ibis-macro] Minutes from the 29 Nov 2011 ibis-atm meeting
- From: Mike LaBonte <mike@xxxxxxxxxxx>
- To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
- Date: Tue, 29 Nov 2011 16:37:34 -0500
Minutes from the 29 Nov 2011 ibis-atm meeting are attached.
Mike
IBIS Macromodel Task Group
Meeting date: 29 Nov 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
Celsionix: Kellee Crisafulli
Cisco Systems: Ashwin Vasudevan
Syed Huq
Ericsson: Anders Ekholm
IBM: Greg Edlund
Intel: Michael Mirmak
LSI Logic: Wenyi Jin
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
------------------------------------------------------------------------
Opens:
- None
--------------------------
Call for patent disclosure:
- None
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Review of ARs:
- None
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New Discussion:
Arpad showed a new Model_types BIRD proposal:
- David: The added text for Usage Rules should have "or" instead of "and"
- Arpad made those changes
- There were no other comments
- Bob motioned to approve for submittal
- David seconded
- No one opposed, the motion passed by acclamation
AR: Arpad submit modified Model_types BIRD to Open Forum
Arpad showed BIRD 140.1:
- Bob: In V-t the "T" should be uppercase
- In the last change paragraph the i.e. should have a comma
- Curtis: "device" is misspelled "deice" at the end of a paragraph.
- Ambrish: The same error is found on page 3
- No, that is the same place
- Bob: The added text for pgs. 107 & 125 is not OK for 125
- Arpad: Could we have a buffer model in an [External Circuit]?
- Bob: [External Model] would be used for that
- Arpad: That was an interim solution
- [External Circuit] is a more general solution, suitable for models too
- Bob: This whole area is not very clear
- Arpad showed page 125 of IBIS 5.0
- Walter: For buffer models min/typ/max means slow/typ/fast
- Interconnect may be independent of process corners
- Arpad: [External Circuit] is usually on-die routing
- Would min/max be independent of process corner?
- Walter: That would be correlated
- Arpad: Section 9 already establishes a min/max - slow/fast relationship
- Mike: The page 125 change might begin with "Circuits" instead of "Models"
- David: A user validating setup and hold would the shortest etch
- Ken: Impedance would be different
- Walter: We should talk in the context of derivation methods
- Arpad: Would leave this change off page 125 for now
- Bob: That would be good until we have better wording
- Arpad altered the BIRD to change only page 107
- Fangyi: It no longer says there is no fast/slow relationship between AMI and
IBIS?
- Arpad highlighted a section that replaces that
- Arpad: We are replacing most slow/fast with min/max for AMI purposes
- Fangyi: AMI Range parameters will have no relationship to IBIS corner
- Arpad highlighted a paragraph that explains AMI to IBIS relationships
- Fangyi: It should say "AMI" and "IBIS" to be more clear
- Arpad made changes to the paragraph about Range
- Bob motioned to submit this to Open Forum as modified
- It should also say that page 125 is not modified
- Arpad will add that
- Ken seconded
- No one opposed, the motion passed by acclamation
AR: Arpad submit BIRD 140.1 with modifications to Open Forum
Walter showed an email about BIRD 123.3
- Walter: The contentious issue is that Rx_Rj, Rx_DCD, Rx_Sj apply to both TD
and statistical
- David: How can we combine DCD and Sj to one deterministic jitter parameter
like Rx_Dj?
- There should be a new parameter for that
- Fangyi: Is Dj a number or distribution
- David: We have tabled spectral functions
- Walter: We need a mathematical description of that
- Hopefully EDA vendors can resolve this offline
- Fangyi: Can this be ignored in statistical?
- Walter: The question is if it can be ignored in statistical mode
- David: If a model returns ideal clock times is it TD or statistical?
- Walter: In the 2nd case these parameters would not be used if the model
returns clock_ticks
- Fangyi: Is the 1st case processed by the tool?
- Walter: 1st case applies when you have Getwave with or without clock_times
- 2nd case is only Getwave with clock_times
AR: David write mathematical description of combined Dj proposal
- Walter: Most vendors have touchstone implementations
- Can we allow S12 = 0 and S12 != S21?
- Should there be E elements to isolate Touchstone calls?
- BIRD 120 allows any number of corner values
- Ambrish and Arpad have not yet shown this in their proposals
- David: What is pad?
- Walter: Where the die connects to the package
- This is in the silicon
- It can be used where there is a T-coil to reduce effective C_comp
- Fangyi: The first circuit is incomplete, no termination
- The E element helps
- Walter: The 1st will work if connected to a voltage source
- Fangyi: The E elements are needed only for TX?
- Walter: We assume the RX input is high impedance
- Either the EDA tool puts it in or the subcircuit has it
- Fangyi: S12 and S21 have a physical meaning
- The magnetic field is affected
- Walter: How do we handle these s-parameters from IBM?
- Fangyi: The model vendor must generate a proper s-parameter model
AR: Ambrish and Arpad produce examples of 5 corners with Touchstone files in
their proposals
Meeting ended.
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Next meeting: 06 Dec 2011 12:00pm PT
Next agenda:
1) Task list item discussions
-------------
IBIS Interconnect SPICE Wish List:
1) Simulator directives
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