Minutes of SPI-3 Working Group -- June 19, 1998

John Lohmeyer lohmeyer at ix.netcom.com
Fri Jun 19 18:44:12 PDT 1998

* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* John Lohmeyer <lohmeyer at ix.netcom.com>
Accredited Standards Committee*
National Committee for Information Technology Standards (NCITS)

                                                      Doc. No.: T10/98-190r0
                                                          Date: June 19, 1998
                                                      Reply to: John Lohmeyer

To:      T10 Membership
From:    John Lohmeyer and George Penokie
Subject: SPI-3 Working Group Meeting -- June 19, 1998
         Huntington Beach, CA


1. Opening Remarks
2. Approval of Agenda
3. Attendance and Membership
4. SPI-3 Topics
4.1 CRC Proposals
4.2 Domain Validation
4.3 QAS
4.4 Parallel Protocol Request Negotiation
4.5 Fast-80
5. Meeting Schedule
6. Adjournment

Results of Meeting

1.   Opening Remarks

John Lohmeyer, the T10 Chair, called the meeting to order at 9:05 a.m., Friday
June 19, 1998. He thanked Skip Jones of QLogic for hosting the meeting and
providing lunch.

As is customary, the people attending introduced themselves and a copy of the
attendance list was circulated. John noted that standards are not permitted to
contain known patented material unless the patent holder agrees to comply with
the ANSI patent policy.

2.   Approval of Agenda

The draft agenda was approved.

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. Richard Moore      A# Adaptec, Inc.             richard_moore at corp.
Mr. Edward Haske       O  CMD Technology            haske at cmd.com
Mr. Robert C. Elliott  P  Compaq Computer Corp.     Robert.Elliott at compaq.com
Mr. George Penokie     P  IBM Corp.                 gop at us.ibm.com
Mr. Allen Dela Cruz    A  LSI Logic Corp.           allend at lsil.com
Mr. Skip Jones         P  QLogic Corp.              sk_jones at qlc.com
Mr. Ting Li Chan       A  QLogic Corp.              t_chan at qlc.com
Mr. William Dennin     V  QLogic Corp.              w_dennin at qlc.com
Mr. Greg Goodemote     V  QLogic Corp.              g_goodemote at qlc.com
Mr. Chuck Micalizzi    V  QLogic Corp.              c_micalizzi at qlc.com
Mr. Fardad Siavoshi    V  QLogic Corp.              f_siavoshi at qlc.com
Mr. Thinh Tran         V  QLogic Corp.              th_tran at qlc.com
Mr. Mark Evans         A  Quantum Corp.             mark.evans at quantum.com
Mr. James McGrath      A# Quantum Corp.             JMCGRATH at QNTM.COM
Mr. Duncan Penman      V  Quantum Corp.             duncan.penman at qntm.com
Mr. Bruce Leshay       V  Quantum Corp.             bleshay at tdh.qntm.com
Mr. Richard Uber       V  Quantum Corp.             duber at tdh.qntm.com
Mr. Thom Steury        V  Rancho Technology         tsteury at rancho.com
Mr. Gene Milligan      P  Seagate Technology        Gene_Milligan at notes.
Mr. Daniel (Dan) F.    O  Seagate Technology        daniel_f_smith at notes.
Smith                                               seagate.com
Mr. Mayank R. Patel    V  Seagate Technology        patel at cdg.stsv.seagate.
Mr. Bill Gintz         V  Seus, Inc.                wcgintz at ix.netcom.com
Mr. John Lohmeyer      P  Symbios, Inc.             lohmeyer at ix.netcom.com
Mr. Frank Gasparik     V  Symbios, Inc.             frank.gasparik at symbios.
Mr. Tracy Spitler      V  Symbios, Inc.             tracy.spitler at symbios.com
Mr. Brett Philip       O  Temp Flex Cable Inc.      bphilip at templex.com

Mr. Paul D. Aloisi     P  Unitrode Corporation      aloisi at unitrode.com
Mr. Jeffrey L.         P  Western Digital           Jeffrey.L.Williams at wdc.
Williams                  Corporation               com
Mr. Gregory Kapraun    A  Western Digital           Gregory.D.Kapraun at wdc.com

31 People Present

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

4.   SPI-3 Topics

4.1  CRC Proposals

Jim McGrath presented the portions of 98-177r2 related to CRC. There was a
discussion about whether the pad bytes before the CRC should be reserved (i.e.
zero) or ignored (i.e. vendor specific). No consensus was reached and a straw
poll indicated 6 favored ignored and 4 favored reserved. This issue needs to
be resolved at the next working group meeting.

The group agreed that the ACK has to be deasserted before any phase change can

4.2  Domain Validation

Jim McGrath spoke about the changes made in 98-176r3 as a result of a
conference call on June 8th.

There was also some discussion about skew compensation.  We will eventually
need to agree on whether transmitters, receivers, or initiators perform the
skew compensation function.  Also, simple expanders complicate the picture; do
they get involved with skew compensation?

4.3  QAS

George Penokie presented foils on a QAS timing example (98-159r1).  It was
noticed that there was an apparent problem with when the BSY signal is
released. Initially, it appeared that existing devices might respond to
selection during the QAS protocol, however no existing device will participate
in QAS so its ID will not be present during the QAS protocol. Therefore
existing devices will not see a false selection during QAS.  New devices will
need to be designed so that they do not respond to selection during QAS if
they have arbitrated and lost.  That is, they need to qualify selection with
all the old selection criteria plus the state information of the QAS protocol.

Several minor changes were made to 98-159r1 and George agreed to prepare rev 2
for the next mailing.

4.4  Parallel Protocol Request Negotiation

This item was deferred until the July meeting.

4.5  Fast-80

Richard Uber presented 98-192r0, Experimental Results on Fast-80 SCSI Signals.
Duncan Penman presented 98-193r0, Fast-80 Simulated Host Waveforms and
98-194r0, Fast-80 Target Source Waveforms.  Duncan noted that so far ISI has
not been a problem with the cables that he is using.

Richard Uber presented 98-195, ISI Testing at 25 Meters.

It was noted that the recommendation to use glitch filters in SPI-2 only
appears in the section on single-ended drivers and receivers.  This probably
was an error as most people remembered that the glitch filter recommendation
was intended to apply to all driver/receiver types.  The working group
unanimously recommended that the wording recommending usage of glitch filters
be added into the LDV section of SPI-3.

Richard recommended that the stub length be reduced from 10 cm to 5 or 6 cm.
Devices that include a non-disabled terminator could continue to use a 10 cm
stub length.

Richard noted that current technology multimode terminators use multiple
packages (usually 9 lines terminated per chip).  Process variations from chip
to chip can affect signal margins.  He recommended that LVD (not multimode)
terminators be used in configurations where maximum signal margins are needed.

Optimal point-to-point performance can be achieved using round cables with
characteristic impedance that matches the terminator impedance.

Gene Milligan presented 98-153r2.  He plans to change the system deskew delay
on Fast-10, Fast-20, Fast-40, and Fast-80 to 45nsec. Anyone who has a problem
with the change should being it up at the next SPI-3 working group meeting.

5.   Meeting Schedule

The next meeting of SPI-3 Working Group will be Tuesday, July 14, 1998 from 9
am to 6 pm in Portland, ME at the Holiday Inn By the Bay (207-775-2311),

hosted by Digital Equipment Corp.
6.   Adjournment

The meeting was adjourned at 4:30 p.m. on Friday June 19, 1998.

John Lohmeyer                  Email: lohmeyer at ix.netcom.com
Symbios, Inc.                  Voice: +1-719-533-7560
4420 ArrowsWest Dr.              Fax: +1-719-533-7036
Colo Spgs, CO 80907              BBS: +1-719-533-7950

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