Draft Minutes of SCSI Physical WG -- Feb 9-10, 2000

John Lohmeyer lohmeyer at t10.org
Thu Feb 17 14:03:02 PST 2000


* From the T10 Reflector (t10 at t10.org), posted by:
* John Lohmeyer <lohmeyer at t10.org>
*
A PDF version of these minutes is available at:

  ftp://ftp.t10.org/t10/document.00/00-134r0.pdf


Accredited Standards Committee*
National Committee for Information Technology Standards (NCITS)

                                                Doc. No.: T10/00-134r0
                                                    Date: February 17, 2000
                                                Reply to: John Lohmeyer

To:      T10 Membership
From:    John Lohmeyer
Subject: SCSI Physical Working Group Meeting -- February 9-10, 2000
         Huntington Beach, CA

Agenda
1.     Opening Remarks
2.     Approval of Agenda
3.     Attendance and Membership
4.     SPI-4 Physical Topics
4.1      SPI-4 ISI reduction via transmit pre-compensation (99-260, 99-332)
[Petty]
4.2      SPI-4 timing budget utilizing receiver signal deskew method (99-261)
[Petty]
4.3      SPI-4 clocking proposal (99-262) [Petty]
4.4      Proposal for Fast-160 to be included in SPI-4 (99-295) [Milligan]
4.5      Proposal for turn-on/turn-off of a free-running clock (99-298)
[Evans]
4.6      Fast-160 Phase Encoded Data Enabling (99-323) [Moore]
4.7      ISI Measurements for Ultra4 Discussion (99-326) [Smith]
4.8      ISI Measurements (99-337) [Bridgewater/Bastiani]
4.9      Compensation Techniques (00-104) [Bishop]
4.10     Issues with Implementing Transmitter Pre-Compensation (00-103) [Uber]
4.11     Ultra 320 Calibration Strategy (00-105) [Brown]
4.12     Ultra 320 Summary and Recommendations (00-106) [Evans]
4.13     Use of eye measurements (00-126) [Bastiani]
4.14     Ultra320 SCSI Calibration Protocol (00-133) [Leshay]
4.15     Proposal for training pattern to be included in SPI-4 (00-132)
[Evans]
4.16     Ultra320 SCSI vs. Ultra160 SCSI Eye Diagram Data (00-147) [Brown]
5.     SPI-4 Protocol Topics
5.1      SCSI out of band communications method (99-213) [Petty]
5.2      Extended Addressing for SPI-4 (99-249, 99-250) [Monia]
5.3      Margin Control (99-264) [Lamers]
5.4      Flow Control & Continue I/O Process Flag (99-142) [Lamers]
5.5      Expander Guidelines (99-282) [Lamers]
5.6      Echo Buffer Considerations (99-306) [Lamers]
5.7      Flow Control & Read Streaming (00-142) [Lamers]
5.8      PPR Message Enhancements (99-283) [Lamers]
6.     Domain Validation Technical Report Topics
7.     New Business
8.     Meeting Schedule
9.     Adjournment


Results of Meeting

1.     Opening Remarks

John Lohmeyer, the T10 Chair, called the meeting to order at 1:10 p.m.,
Wednesday February 9, 2000.  He thanked Skip Jones of QLogic for hosting the
meeting.

As is customary, the people attending introduced themselves and a copy of the
attendance list was circulated.


2.     Approval of Agenda

The draft agenda was approved with the deletion of item 4.5:

4.5      Proposal for turn-on/turn-off of a free-running clock (99-298)
[Evans] {Agenda item deleted}

During the course of the meeting, the following agenda items were
added/revised:

4.1      SPI-4 ISI reduction via transmit pre-compensation (99-260, 99-332)
[Petty] {Agenda item deleted}
4.2      SPI-4 timing budget utilizing receiver signal deskew method (99-261)
[Petty] {Agenda item deleted}
4.9      Compensation Techniques (00-104) [Bishop] {Agenda item deleted}
4.11     Ultra 320 Calibration Strategy (00-105) [Brown] {Agenda item deleted}
4.16     Ultra320 SCSI vs. Ultra160 SCSI Eye Diagram Data (00-147) [Brown]
5.7      Flow Control & Read Streaming (00-142) [Lamers]
5.8      PPR Message Enhancements (99-283) [Lamers]


3.     Attendance and Membership

Attendance at working group meetings does not count toward minimum attendance
requirements for T10 membership.  Working group meetings are open to any
person or organization directly and materially affected by T10's scope of
work.  The following people attended the meeting:

         Name          S        Organization         Electronic Mail Address
---------------------- -- ------------------------- -------------------------
Mr. Lawrence J. Lamers P  Adaptec, Inc.             ljlamers at ieee.org
Mr. Vincent Bastiani   A# Adaptec, Inc.             bastiani at corp.adaptec.com

Mr. Wally Bridgewater  A# Adaptec, Inc.             wally at eng.adaptec.com
Mr. Bill Galloway      P  BREA Technologies, Inc.   billg at breatech.com
Mr. Joseph Basista     O  C&M Corp.                 joebasista at aol.com
Mr. Edward Haske       P  CMD Technology            haske at cmd.com
Mr. Robert C. Elliott  P  Compaq Computer Corp.     Robert.Elliott at compaq.com
Dr. William Ham        A  Compaq Computer Corp.     bill.ham at digital.com
Mr. Charles Tashbook   P  Dallas Semiconductor      charles.tashbook at dalsemi.
                                                    com
Mr. Eugene Lew         P  Fujitsu                   elew at fcpa.fujitsu.com
Mr. George O. Penokie  P  IBM Corp.                 gop at us.ibm.com
Mr. John Lohmeyer      P  LSI Logic Corp.           lohmeyer at t10.org
Mr. Frank Gasparik     V  LSI Logic Corp.           frank.gasparik at lsil.com
Mr. Alan Littlewood    V  LSI Logic Corp.           alanl at lsil.com
Mr. William Petty      V  LSI Logic Corp.           william.petty at lsil.com
Mr. Larry Barnes       V  LSI Logic Corp.           larry.barnes at lsil.com
Mr. Michael Bratvold   V  LSI Logic Corp.           mike.bratvold at lsil.com
Mr. Brian Day          V  LSI Logic Corp.           brian.day at lsil.com
Mr. Makeshwar          V  Lucent Technologies       makesh at lucent.com
Kothandaraman
Mr. Mark Strauss       V  Lucent Technologies       msstrauss at lucent.com
Mr. Jay Neer           P  Molex Inc.                jneer at molex.com
Mr. Richard Moore      A# QLogic Corp.              r_moore at qlc.com
Mr. Dean Wallace       A  QLogic Corp.              d_wallace at qlc.com
Mr. Ting Li Chan       V  QLogic Corp.              t_chan at qlc.com
Mr. Richard L.         V  QLogic Corp.              r_romaniec at qlc.com
Romaniec
Mr. Mark Evans         P  Quantum Corp.             mark.evans at quantum.com
Mr. Bruce Leshay       V  Quantum Corp.             bleshay at tdh.qntm.com
Mr. Richard Uber       V  Quantum Corp.             duber at tdh.qntm.com
Mr. Russ Brown         V  Quantum Corp.             russ.brown at quantum.com
Mr. Daniel (Dan) F.    O  Seagate Technology        daniel_f_smith at notes.
Smith                                               seagate.com
Mr. Mayank R. Patel    V  Seagate Technology        mayank_r_patel at notes.
                                                    seagate.com
Mr. Bill Gintz         V  Seus, Inc.                wcgintz at ix.netcom.com
Mr. Ron Roberts        V  Sierra-Pac Technology     rkroberts at aol.com
Mr. Paul D. Aloisi     P  Texas Instruments         Paul_Aloisi at ti.com
Mr. Donald R. Getty    A# Texas Instruments         donald_getty at ti.com
Mr. Mike Kosco         V  Texas Instruments         mike at mvbuilders.com

36 People Present

Status Key:  P    -  Principal
             A,A# -  Alternate
             O    -  Observer
             L    -  Liaison
             V    -  Visitor



4.     SPI-4 Physical Topics


4.1    SPI-4 ISI reduction via transmit pre-compensation (99-260, 99-332)
[Petty]

Bill Petty asked that this item be deleted in favor of item 4.4.

4.2    SPI-4 timing budget utilizing receiver signal deskew method (99-261)
[Petty]

Bill Petty asked that this item be deleted in favor of item 4.4.

4.3    SPI-4 clocking proposal (99-262) [Petty]

Bill Petty presented 99-262r2, SPI-4 REQ/ACK ISI removal via qualified
clocking method with combined Deskew Training method.  Bill said that the main
difference in this proposal is that it combines the training and clocking
methods, which have to be considered together.  Based on the input received,
Bill said he would prepare another revision of his proposal to include
on-demand training and toggling the signals prior to training to clear any
ISI.

4.4    Proposal for Fast-160 to be included in SPI-4 (99-295) [Milligan]

This topic was deferred to a future meeting.

4.5    Proposal for turn-on/turn-off of a free-running clock (99-298) [Evans]

Mark Evans asked that this item be deleted.

4.6    Fast-160 Phase Encoded Data Enabling (99-323) [Moore]

Richard Moore presented 99-323r2, Fast-160 Phase Encoded Data Enabling.

George asked for a recommendation on the proposal.  Larry Lamers and Bruce
Leshay said that while they liked the concept and architecture, they felt that
the training pattern is still premature.  They prefered that the proposal not
be adopted until there is agreement on the training pattern.

4.7    ISI Measurements for Ultra4 Discussion (99-326) [Smith]

This topic was deferred to a future meeting.

4.8    ISI Measurements (99-337) [Bridgewater/Bastiani]

This topic was deferred to a future meeting.

4.9    Compensation Techniques (00-104) [Bishop]

This topic was deleted.

4.10   Issues with Implementing Transmitter Pre-Compensation (00-103) [Uber]

Dick Uber presented 00-103r2, Issues with Implementing Transmitter
Pre-Compensation.  He said that the document was mostly a repeat of the same
presentation from the December `99 meeting in Rochester.

4.11   Ultra 320 Calibration Strategy (00-105) [Brown]

This topic was deleted.

4.12   Ultra 320 Summary and Recommendations (00-106) [Evans]

Mark Evans presented 00-106r1, Ultra320 SCSI Summary and Recommendations.
This document states the case for doing receiver equalization instead of
transmitter precompensation.  Wally Bridgewater asked for examples of parallel
interfaces that use receiver equalization.  Mark knew of none.  Wally
questioned whether receiver equalization would be stable enough to not
introduce signal skews.

4.13   Use of eye measurements (00-126) [Bastiani]

Vince Bastiani presented 00-126r1, Fast-160 Timing Specification.  Bill Ham
presented an impromptu foil on the case for defining a standard filter design
for the purpose of measuring received signals.  This provoked considerable
discussion that converged on a request for Bill to write up his ideas.  John
assigned 00-149 to Bill to document his ideas.

4.14   Ultra320 SCSI Calibration Protocol (00-133) [Leshay]

Bruce Leshay presented 00-133r0, Ultra320 SCSI Calibration Protocol.  Concern
was expressed about the time to send the training pattern, which can exceed
the data time.  There were some suggestions on ways to minimize the impact by
only training once per connection.  Bruce plans to revise his proposal for the
next meeting.

4.15   Proposal for training pattern to be included in SPI-4 (00-132) [Evans]

Mark Evans presented 00-132r0, Proposal for training pattern protocol to be
included in SPI-4.  He plans to revise the proposal for the next meeting.

4.16   Ultra320 SCSI vs. Ultra160 SCSI Eye Diagram Data (00-147) [Brown]

Russ Brown presented 00-147r0, Ultra320 SCSI vs. Ultra160 SCSI Eye Diagram
Data.  The data suggested that Ultra160 does not have adequate margin under
worst case conditions.  Increasing drive current beyond the minimum
requirements in SPI-3 overcomes the problem.  The Quantum people asserted that
transmitter pre-compensation for Ultra320 would not work even with increased
amplitude.


5.     SPI-4 Protocol Topics

5.1    SCSI out of band communications method (99-213) [Petty]

Bill Petty said he had made no changes to his proposal.  He gave a brief
overview of the proposal for the benefit of those who had not heard it before.
He said that LSI had tested the protocol in the lab and had found no problems.

George Penokie questioned whether this proposal belongs in the SPI-4 document
at all.  It was suggested that the topic may more properly belong in the SDV
project or in a new technical report project.

5.2    Extended Addressing for SPI-4 (99-249, 99-250) [Monia]

Larry Lamers asked that this topic be deleted from future agendas.

5.3    Margin Control (99-264) [Lamers]

Larry Lamers presented 99-264r3, Margin Control.  There topic of whether the
margin controls should be in a command or message was briefly debated with no
resolution.

5.4    Flow Control & Continue I/O Process Flag (99-142) [Lamers]

Larry Lamers asked that this topic be deleted from future agendas.

5.5    Expander Guidelines (99-282) [Lamers]

Larry Lamers asked that this topic be deleted from future agendas.


5.6    Echo Buffer Considerations (99-306) [Lamers]

Larry Lamers briefly presented 00-109r1, SPC-3 Echo Buffer Size.  It was noted
that this proposal is for SPC-2 and should be transferred to the SCSI Protocol
WG agenda.

5.7    Flow Control & Read Streaming (00-142) [Lamers]

Larry Lamers presented 00-142r0, Flow Control & Read Streaming.  His proposal
uses the P0 signal to add flow control to read operations.  Based on the
discussion, he agreed to make several minor changes to rev 1 of his proposal.

5.8    PPR Message Enhancements (99-283) [Lamers]

Larry Lamers presented 99-283r1, PPR Message Enhancements.  He noted that his
marketing people had objected to calling speeds U1, U2, etc., so he now uses
EWE1, EWE2, etc.


6.     Domain Validation Technical Report Topics

Larry Lamers said that he expects to have a rev 0 document of the SDV
technical report soon.


7.     New Business

No new business was brought before the group.


8.     Meeting Schedule

The next meeting of the SCSI Physical Working Group will be Tuesday, March 7,
2000 commencing at 9 a.m. until 8 p.m. at the Crowne Plaza Suites
(972-233-7600) in Dallas, TX hosted by Texas Instruments.

The subsequent meetings of this group are March 27 starting at 1 pm and
continuing to March 28 in Milpitas, CA and April 26 starting at 1 pm and
continuing to April 27 in Colorado Springs, CO.


9.     Adjournment

The meeting was adjourned at 12:40 p.m. on Thursday February 10, 2000.

--
John Lohmeyer                  Email: lohmeyer at t10.org
LSI Logic Corp.                Voice: +1-719-533-7560
4420 ArrowsWest Dr.              Fax: +1-719-533-7183
Colo Spgs, CO 80907

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