Minutes of SPI-2 Working Group -- October 10, 1996
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
Accredited Standards Committee*
X3, Information Technology
Doc. No.: X3T10/96-xxx
Date: October 15,
Reply to: Mr. John
Colo Spgs, CO
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
earlier in the week.
Attendance at working group meetings does not count toward minimum
requirements for X3T10 membership. Working group meetings are open to
person or organization directly and materially affected by X3T10's scope
work. The following people attended the meeting:
Name S Organization Electronic Mail
---------------------- -- -------------------------
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
Fast-20, SIP, and SPI-2 Rev 11 documents into a unified SPI-2 document.
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
(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
milliamps at 0.2 v D.C.; don't require driver to sink this to avoid
qualify; add a min at 0.5 v D.C.; how to deal with non-linear
we need a duty-cycle spec? suggest 20 asserted signals for wide, 12
37 on 32-bit. Add exception for a contained bus (e.g., laptop) of
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
(SFF-8040)), signal ground and ground ground for tables defining SE
6. SE Receiver - hysterisis (.3), input levels (adopt F20), pin leakage
(same), glitch filtering (enable of first detection of a transition
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
allow 32-bit data path and 32 SCSI IDs addressability when using
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
10. Cable specifications - impedance (loaded & unloaded), skew, wire
11. Add Q-cable pinouts
12. Micro SCSI pinouts
The group discussed some possible solutions for several of the issues.
the group was quite small, the resolution of these issues was deferred to
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
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
the ftp site
The next meetings of the SPI-2 Working Group are: November 4, 1996 in
Springs, CA and December 5, 1996 in Bloomington, MN (with X3T11).
* For SCSI Reflector information, send a message with
* 'info scsi' (no quotes) in the message body to majordomo at symbios.com
More information about the T10