Minutes of SPI-2 Working Group -- October 10, 1996

Lohmeyer, John JLOHMEYE at cossymwest.co.symbios.com
Tue Oct 15 12:09:00 PDT 1996


* From the SCSI Reflector (scsi at symbios.com), posted by:
* "Lohmeyer, John" <JLOHMEYE at COSSYMWEST.CO.SYMBIOS.COM>
*

SPI-2 Working Group -- October 10, 1996                    X3T10/96-xxx   
R0

Accredited Standards Committee*
X3, Information Technology
                                                 Doc. No.: X3T10/96-xxx   
R0
                                                     Date: October 15,   
1996
                                                  Project: 1142-D
                                                Ref. Doc.:
                                                 Reply to: Mr. John   
Lohmeyer
                                                           Symbios Logic   
Inc.
                                                           4420   
ArrowsWest Dr.
                                                           Colo Spgs, CO   
80907
                                                           (719) 533-7560

To:         X3T10 Membership
From:       John Lohmeyer, X3T10 Chair
            Larry Lamers, X3T10 Vice Chair
Subject:    SPI-2 Working Group -- October 10, 1996
            St. Petersburg Beach, FL

A small SPI-2 Working Group meeting was held October 10, 1996 in St.
Petersburg Beach, FL hosted by Charles Brill of AMP, Inc.  John Lohmeyer
thanked Chuck for hosting the meeting and the exciting weather (TS   
Josephine)
earlier in the week.

Attendance at working group meetings does not count toward minimum   
attendance
requirements for X3T10 membership.  Working group meetings are open to   
any
person or organization directly and materially affected by X3T10's scope   
of
work.  The following people attended the meeting:

         Name          S        Organization         Electronic Mail   
Address
 ---------------------- -- -------------------------   
 -------------------------
Mr. Lawrence J. Lamers A  Adaptec, Inc.             ljlamers at aol.com
Mr. Michael Wingard    O  Amphenol Interconnect     mikwingard at aol.com
Mr. Louis Grantham     P  Dallas Semiconductor      grantham at dalsemi.com
Dr. William Ham        A# Digital Equipment Corp.   
  ham at subsys.enet.dec.com
Mr. John Lohmeyer      P  Symbios Logic Inc.   
       john.lohmeyer at symbios.com
Mr. Paul D. Aloisi     P  Unitrode Corporation      aloisi at unitrode.com

6 People Present

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

The group focused on identifying the integration issues of merging the   
SPI,
Fast-20, SIP, and SPI-2 Rev 11 documents into a unified SPI-2 document.   
 Larry
Lamers prepared the following issue list to document the meeting results:

SPI-2 Unified Document (SPUD) Integration Issues

1.  Active negation - map of existance (see X3T10/95-295); map of   
intensity
    (use F20 envelope)
2.  SE termination, max/min current & sinking of current (see X3T10/96-
    222r1); suggest min current 20 milliamps at 0.2 v D.C.and a max of   
25.4
    milliamps at 0.2 v D.C.;  don't require driver to sink this to avoid   
re-
    qualify; add a min at 0.5 v D.C.; how to deal with non-linear   
terminators; do
    we need a duty-cycle spec? suggest 20 asserted signals for wide, 12   
on narrow,
    37 on 32-bit.  Add exception for a contained bus (e.g., laptop) of   
less than
    0.3 meters. Add a 12.5 pf max capacitance for terminator.
3.  Leakage spec increased for LVD multi-mode drivers to 20 micro-amps -
    Resolve by specifing one for each driver type.
4.  Latching & counting - require that they be a monatomic action for hot
    plugging - possibly an annex or implementation note.
5.  Ground - power, logic & ground drivers (25-pin power & ground   
connected
    (SFF-8040)), signal ground and ground ground for tables defining SE   
signals.
6.  SE Receiver - hysterisis (.3), input levels (adopt F20), pin leakage
    (same), glitch filtering (enable of first detection of a transition   
for 'x'
    duration).  Need an algorythm to determine 'x'.
7.  SE Drivers - slew rate (use F20 specs);
8.  16 or 32 devices? 32-bit data path? Is it a single segment draft?
    Should expanders be included?  Suggest that SPI-2 is 16 loads per   
segment max;
    allow 32-bit data path and 32 SCSI IDs addressability when using   
VHDCI
    connectors with primary and secondary cables
9.  Case 4 hot plugging - requires SCA-2 connectors to allow precharge, a
    resistive contact may also work, needs research to determine max   
distrubance.
10. Cable specifications - impedance (loaded & unloaded), skew, wire   
gauge,
    attenuation
11. Add Q-cable pinouts
12. Micro SCSI pinouts

The group discussed some possible solutions for several of the issues.   
 Since
the group was quite small, the resolution of these issues was deferred to   
the
Palm Springs meeting November 4th, where a larger group is expected.

Bill Ham prepared X3T10/96-252 on Case 4 hot plugging for SPI-2.  It   
outlines
three possible methods of achieving data integrity with LVD case 4 hot
plugging.  This document (96-252r0.doc) will be placed on the SCSI BBS   
and on
the ftp site   
(ftp://ftp.symbios.com/pub/standards/io/x3t10/document.96/96-
252r0.doc).

The next meetings of the SPI-2 Working Group are:  November 4, 1996 in   
Palm
Springs, CA and December 5, 1996 in Bloomington, MN (with X3T11).
*
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