[ibis-quality] Minutes for Apr 28 through May 12 ibis-quality meetings
- From: "Mike LaBonte (milabont)" <milabont@xxxxxxxxx>
- To: <ibis-quality@xxxxxxxxxxxxx>
- Date: Fri, 15 May 2009 15:13:49 -0400
Minutes for ibis-quality meetings from April 28 through May 12 are
attached.
Mike
Minutes, IBIS Quality Committee
12 May 2009
11-12 AM EST (8-9 AM PST)
ROLL CALL
Adam Tambone
* Anders Ekholm, Ericsson
Barry Katz, SiSoft
Benny Lazer
Benjamin P Silva
Bob Cox, Micron
* Bob Ross, Teraspeed Consulting Group
Brian Arsenault
David Banas, Xilinx
Eckhard Lenski, Nokia Siemens Networks
Eric Brock
* Guan Tao, Huawei Technologies
Gregory R Edlund
Hazem Hegazy
Huang Chunxing, Huawei Technologies
John Figueroa
John Angulo, Mentor Graphics
Katja Koller, Nokia Siemens Networks
Kevin Fisher
Kim Helliwell, LSI Logic
Lance Wang, IOMethodology
Lynne Green
* Mike LaBonte, Cisco Systems
Mike Mayer, SiSoft
* Moshiul Haque, Micron Technology
Muniswarareddy Vorugu, ARM Ltd
* Pavani Jella, TI
Peter LaFlamme
Randy Wolff, Micron Technology
Radovan Vuletic, Qimonda
Robert Haller, Enterasys
Roy Leventhal, Leventhal Design & Communications
Sherif Hammad, Mentor Graphics
Todd Westerhoff, SiSoft
Tom Dagostino, Teraspeed Consulting Group
Kazuyoshi Shoji, Hitachi
Sadahiro Nonoyama
Liqun, Huawei
Everyone in attendance marked by *
NOTE: "AR" = Action Required.
-----------------------MINUTES ---------------------------
Mike LaBonte conducted the meeting.
Call for patent disclosure:
- No one declared a patent.
AR Review:
- Mike look into MeetingPlace issues
- This is a WebEx meeting now
- Some had difficulties getting in:
- Web sharing crashed the first time for Anders
- Bob had to click Attend Meeting, did not see it at first
- Mike: There should be a URL to go straight to Attend
New items:
Continued review of the IQ 1.1 specification:
5.5.3. {LEVEL 2} [Ramp] dV consistent with supply voltages
- Mike: Not sure if we decided last time to delete 5.5.3
- Anders: We discussed this 2 meetings ago
- 5.5.3 is much easier to check than 5.5.4
- Mike: But both are needed to achieve level 2
- Mike: We will eventually drop 5.5.4 when IBISCHK implements it
- Anders: Are we requiring software to perform these checks?
- Mike: We could drop 5.5.4 from IQ now and immediately file a bug report
- Bob: We could note that a more rigorous check will appear in IBISCHK
- Vote: Should we drop 5.5.3 and keep 5.5.4?
- Anders: yes
- Bob: yes
- Guan: yes
- Mike: yes
- Pavani: yes
- We voted to remove the 5.5.3 check
5.5.4. {LEVEL 2} [Ramp] dV consistent with V-T table endpoints
- We change the title of this and completely replaced the contents:
5.5.4. {LEVEL 2} [Ramp] dV consistent with I-V table calculations
- Bob: We can explain the workaround method to have IBISCHK calculate V
- Anders: What will IBISCHK say about the temporary waveforms?
- Will it find other issues?
- Bob: No, IBISCHK doesn't make that many checks
- Mike: The two temporary waveform points could both be -1V
- Bob: Only one point has to be wrong to make IBISCHK print voltages
- Bob: Unfortunately the values are printed with only 2 decimal digits
- There are techniques to find the real value
We added a third paragraph to 5.5.4:
- We immediately removed it because the 2nd paragraph covers that
5.5.5. {LEVEL 2} [Ramp] dt is consistent with 20%-80% crossing time
- We added a 2nd paragraph to explain waveform selection criteria
- Bob: It only applies if the right waveform is present
- We should call for an alternative dt reference if none
- We added a sentence for this
After deleting 5.5.3, 5.5.4 and 5.5.5 became 5.5.3 and 5.5.4
Next meeting: 19 May 2009 11-12 AM EST (8-9 AM PST)
Meeting ended at 12:04 PM Eastern Time.
Minutes, IBIS Quality Committee
28 Apr 2009
11-12 AM EST (8-9 AM PST)
ROLL CALL
Adam Tambone
* Anders Ekholm, Ericsson
Barry Katz, SiSoft
Benny Lazer
Benjamin P Silva
Bob Cox, Micron
* Bob Ross, Teraspeed Consulting Group
Brian Arsenault
David Banas, Xilinx
Eckhard Lenski, Nokia Siemens Networks
Eric Brock
* Guan Tao, Huawei Technologies
Gregory R Edlund
Hazem Hegazy
Huang Chunxing, Huawei Technologies
John Figueroa
John Angulo, Mentor Graphics
Katja Koller, Nokia Siemens Networks
Kevin Fisher
Kim Helliwell, LSI Logic
Lance Wang, IOMethodology
Lynne Green
* Mike LaBonte, Cisco Systems
Mike Mayer, SiSoft
* Moshiul Haque, Micron Technology
Muniswarareddy Vorugu, ARM Ltd
Pavani Jella, TI
Peter LaFlamme
Randy Wolff, Micron Technology
Radovan Vuletic, Qimonda
Robert Haller, Enterasys
Roy Leventhal, Leventhal Design & Communications
Sherif Hammad, Mentor Graphics
Todd Westerhoff, SiSoft
Tom Dagostino, Teraspeed Consulting Group
Kazuyoshi Shoji, Hitachi
Sadahiro Nonoyama
Liqun, Huawei
Everyone in attendance marked by *
NOTE: "AR" = Action Required.
-----------------------MINUTES ---------------------------
Mike LaBonte conducted the meeting.
Call for patent disclosure:
- No one declared a patent.
AR Review:
- Mike look into MeetingPlace issues
- Mike will use WebEx for our next meeting
- MeetingPlace will be the backup
New items:
Should we file an IBISCHK bug report for a dV against I/V check?
- We decided not to do this immediately
[Ramp] dV checks:
- Mike: Possible checks are:
- dV against supply voltage
- dV against V/T endpoints
- dV against I/V
- We voted unanimously to replace 5.5.4 with a dV vs. I/V
- Moshiul: Which of these is the central reference?
- When discrepancies are found, either could be wrong
- Anders: The old 5.5.4 checked against I-V
- Bob: We can synthesize V/T tables based on Ramp to do this in IBISCHK
- The idea is to create fake waveforms with [Ramp] fixtures
- Just one bogus point is needed
- This forces IBISCHK to print the correct voltage calculated from I/V
- How much accuracy to require:
- Anders: This should be much more accurate than V/T endpoint checks
- Bob: Taking 60% of a value reduces the error magnitude
- Mike: Taking a difference doubles the error magnitude
- I/V interpolation will add error too
- Bob: The error limit should be 10%
- Mike: How about 1% ?
- Bob: Tables may not have enough significant digits
- Anders: How about 5%
- Mike: We should set an accuracy criteria based on simulation results
- But dV is not used for anything
- An error of 10mV for a 2.5V part would be 4%
- Anders: This will show if someone has tweaked [Voltage Range]
- Mike: This check can detect poor I/V resolution
- Bob: There can be DC convergence issues
- Mike: And I/V test fixtures are difficult to simulate
- The values calculated from I-V will be the reference for error percentage
Next meeting: 05 May 2009 11-12 AM EST (8-9 AM PST)
Meeting ended at 12:08 PM Eastern Time.
Minutes, IBIS Quality Committee
05 May 2009
11-12 AM EST (8-9 AM PST)
ROLL CALL
Adam Tambone
Anders Ekholm, Ericsson
Barry Katz, SiSoft
Benny Lazer
Benjamin P Silva
Bob Cox, Micron
* Bob Ross, Teraspeed Consulting Group
Brian Arsenault
David Banas, Xilinx
Eckhard Lenski, Nokia Siemens Networks
Eric Brock
Guan Tao, Huawei Technologies
Gregory R Edlund
Hazem Hegazy
Huang Chunxing, Huawei Technologies
John Figueroa
John Angulo, Mentor Graphics
Katja Koller, Nokia Siemens Networks
Kevin Fisher
Kim Helliwell, LSI Logic
Lance Wang, IOMethodology
Lynne Green
* Mike LaBonte, Cisco Systems
Mike Mayer, SiSoft
Moshiul Haque, Micron Technology
Muniswarareddy Vorugu, ARM Ltd
* Pavani Jella, TI
Peter LaFlamme
Randy Wolff, Micron Technology
Radovan Vuletic, Qimonda
Robert Haller, Enterasys
Roy Leventhal, Leventhal Design & Communications
Sherif Hammad, Mentor Graphics
Todd Westerhoff, SiSoft
Tom Dagostino, Teraspeed Consulting Group
Kazuyoshi Shoji, Hitachi
Sadahiro Nonoyama
Liqun, Huawei
Everyone in attendance marked by *
NOTE: "AR" = Action Required.
-----------------------MINUTES ---------------------------
Mike LaBonte conducted the meeting.
Call for patent disclosure:
- No one declared a patent.
AR Review:
- Mike look into MeetingPlace issues
- There was confusion over how to control the meeting invitation with WebEx
- Mike will set up an external test meeting
New items:
Continued review of the IQ 1.1 specification:
5.5.3. {LEVEL 2} [Ramp] dV consistent with supply voltages
- Mike changed the text to:
The [Ramp] dV values must not exceed 60% (80% - 20%) of the supply voltage
range for non-ECL output buffer technologies. The supply voltage range
is either [Pullup Reference] - [Pulldown Reference], or [Voltage Range],
if present. This check is not applicable to current mode technologies
such as ECL, where pulldown operation is not referenced to a voltage
given by [Pulldown Reference] or to a 0V ground.
- Bob: This check should be deleted.
- It is a sanity check only
- 5.5.4 is an overlay check and that is better
- Mike: Also, the description of supply voltage to use is not clear
- For example, ECL does not pull down to 0V
- Bob: the limit could be calculated using -2V for ECL
- Both 5.5.3 and 5.5.4 are required for IQ 2
5.5.4. {LEVEL 2} [Ramp] dV consistent with I-V table calculations
- Bob: IBISCHK should check this
- We could explain the work-around to check this until IBISCHK has it
- Mike: The explanation text that we need was deleted when we replaced 5.5.4
with an entirely new check.
- Mike: This references 5.5.7, which no longer exists.
- The relevant text from that old check should be inserted here.
5.5.5. {LEVEL 2} [Ramp] dt is consistent with 20%-80% crossing time
- Mike: Manual checking of this requires several steps:
- Find the right waveforms
- Determine endpoint voltages
- Set horizontal markers at 20% and 80% points
- Set vertical markers at the crossing points and measure dt
- Pavani: It's a lot of work to calculate this for every model.
- Mike: It should only be necessary to verify that the waveforms used to
generate [Ramp] look right
- If the software calculates dV and dt correctly once, this should be
repeatable
- Bob: Some technologies do not produce useful dt with Ramp fixtures.
- Should be able to check off this test if dt matches any relevant reference
- We can work on 5.5.5 next meeting to incorporate this idea
Mike: The DAC IBIS summit is July 28
- Hopefully we will have IQ 1.1 released, and make a summit presentation
Next meeting: 12 May 2009 11-12 AM EST (8-9 AM PST)
Meeting ended at 12:13PM Eastern Time.
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- » [ibis-quality] Minutes for Apr 28 through May 12 ibis-quality meetings - Mike LaBonte (milabont)
