[ibis-macro] Minutes from 4/20 ibis-atm meeting
- From: "Randy Wolff (rrwolff)" <rrwolff@xxxxxxxxxx>
- To: <ibis-macro@xxxxxxxxxxxxx>
- Date: Thu, 22 Apr 2010 13:56:50 -0600
Minutes are attached from the 4/20 IBIS-ATM meeting.
Randy
IBIS Macromodel Task Group
Meeting date: 20 April 2010
Members (asterisk for those attending):
Adge Hawes, IBM
* Ambrish Varma, Cadence Design Systems
Anders Ekholm, Ericsson
* Arpad Muranyi, Mentor Graphics Corp.
Barry Katz, SiSoft
* Bob Ross, Teraspeed Consulting Group
Brad Brim, Sigrity
Brad Griffin, Cadence Design Systems
Chris Herrick, Ansoft
Chris McGrath, Synopsys
Danil Kirsanov, Ansoft
David Banas, Xilinx
Deepak Ramaswany, Ansoft
Donald Telian, consultant
Doug White, Cisco Systems
Eckhard Lenski, Nokia-Siemens Networks
Eckhard Miersch, Sigrity
Essaid Bensoudane, ST Microelectronics
* Fangyi Rao, Agilent
Ganesh Narayanaswamy, ST Micro
Gang Kang, Sigrity
Hemant Shah, Cadence Design Systems
Ian Dodd, consultant
Jerry Chuang, Xilinx
Joe Abler, IBM
* John Angulo, Mentor Graphics
John Shields, Mentor Graphics
Ken Willis, Sigrity
Kumar Keshavan, Sigrity
Lance Wang, Cadence Design Systems
Luis Boluna, Cisco Systems
* Michael Mirmak, Intel Corp.
Mike LaBonte, Cisco Systems
Mike Steinberger, SiSoft
Mustansir Fanaswalla, Xilinx
Patrick O'Halloran, Tiburon Design Automation
Paul Fernando, NCSU
Pavani Jella, TI
Radek Biernacki, Agilent (EESof)
* Randy Wolff, Micron Technology
Ray Komow, Cadence Design Systems
Richard Mellitz, Intel
Richard Ward, Texas Instruments
Samuel Mertens, Ansoft
Sam Chitwood, Sigrity
Sanjeev Gupta, Agilent
* Scott McMorrow, Teraspeed Consulting Group
Shangli Wu, Cadence Design Systems
Sid Singh, Extreme Networks
Stephen Scearce, Cisco Systems
Steve Kaufer, Mentor Graphics
Steve Pytel, Ansoft
Syed Huq, Cisco Systems
Syed Sadeghi, ST Micro
Ted Mido, Synopsys
Terry Jernberg, Cadence Design Systems
* Todd Westerhoff, SiSoft
Vladimir Dmitriev-Zdorov, Mentor Graphics
Vikas Gupta, Xilinx
Vuk Borich, Agilent
* Walter Katz, SiSoft
Wenyi Jin, LSI Logic
Zhen Mu, Mentor Graphics
------------------------------------------------------------------------
Opens:
None.
--------------------------
Call for patent disclosure:
- No one declared a patent.
-------------
Review of ARs:
- Arpad: Send the clock_times BIRD and updated spreadsheet to Mike L. to be
posted
- done
- Arpad: Update the Flow BIRD based on the suggestions made in the discussion
- done
- Arpad: Write parameter passing syntax proposal (BIRD draft)
for *-AMS models in IBIS that is consistent with the
parameter passing syntax of the AMI models
- TBD
- TBD: Propose a parameter passing syntax for the SPICE
- [External ...] also?
- TBD
- Arpad: Review the documentation (annotation) in the macro libraries.
- Deferred until a demand arises or we have nothing else to do
-------------
New Discussion:
1. Show/discuss updated Task List spreadsheet
Fangyi: Item 10, white space - what about the new line character?
- Arpad: We need to define what 'white space' is in the spec.
CRLF is still a question.
- Michael: This is called a line termination sequence in Touchstone.
- John: Thinks it is common for line terminations to be part of white space.
2. Discuss "AMI flow" diagram
Arpad: Added notes to page 1. On slide 6, added question marks to indicate that
this only works with de-convolution.
- Ambrish: Waveform at Rx pad includes channel as well, so one can convolve
unit impulse response and get a filter of the output.
- Fangyi: Waveform can be any arbitrary waveform used for debugging purpose.
- Arpad: The waveform measured at the Rx pad has driver and channel effects
included. You want to process it with Rx_Init and Rx_GetWave functions.
Fangyi: I can have a waveform generator hooked to the Rx pad.
- Arpad: Yes, but you still have a channel from a cable, circuit board, etc.
- Fangyi: Doesn't think there is double counting of the channel.
Arpad: The channel is included in Rx_Init, then it must be de-convolved before
sending into Rx_GetWave.
Is this a new feature? If it is, we can delete slides 6 and 7.
- Walter: Will need to go through this flow in detail to make sure it is
consistent with the old flow. Could just get rid of logic for the
Init_Returns_Filter (always false) from the new flow.
- Arpad: Started down this path last week. Noticed that he could simplify his
diagrams once removing this logic. Didn't intend to change anything, so he
appreciates the effort to double check the work.
- Fangyi: Thinks what Arpad has now matches the logic of the old flow.
Arpad: Can we delete slides 6 and 7?
- Walter: Would like to answer this next week.
3. Discuss "clock_times" BIRD
Scott: The wording seems to meet requirements of everyone involved. It is
documenting current usage of clock times. The clock time sent back from the
DLL is the actual sample point in the Rx minus one half a bit time or unit
interval. Bit time was already defined, so it was carried through the
language. The BIRD defines that the DLL will return non negative clock time
values always except when returning a -1 to indicate the end of a vector or
to
indicate if there are no valid clock ticks for the duration of a GetWave call.
Arpad: Is there no situation where subtraction of a half clock from the first
value gives a negative number?
- Walter: This is cleaned up. It is possible that one case exists in the
beginning of a simulation where you get one transition of the clock, but
you just ignore that single transition.
- Scott: You are giving up the capability of modeling burst mode DLLs.
- Walter: Bit time is not an AMI parameter, it is passed as an argument on
the DLL call.
- Walter: Also note the 'Bit_Time' should be spelled as 'bit_time'.
- Scott: The AMI DLL subtracts 1/2 UI and the EDA tool adds 1/2 UI. The spec
is clear now that you should never get a negative number in the first clock
tick.
Scott: The other paragraphs provide more detailed information.
Bob: Noted to change 'array' to 'vector'. Also change 'GetWave' to
'AMI_GetWave'.
Change 'clock_tick' to 'clock tick'.
Arpad: Should be able to vote on this next week.
Next meeting: 27 Apr 2010 12:00pm PT
--------
IBIS Interconnect SPICE Wish List:
1) Simulator directives
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