Bill,

I've done a lot of auto-termination in the past based on the principle described so aptly by John Lohmeyer below. Any parallel SCSI  device, 8-bit narrow, 16-bit or 32-bit wide, single ended or LVD, can sense if it is the last device on the SCSI bus/chain by testing any  dedicated ground pin whether it is grounded or floating. It better  be the OUT    :-)   pin.  

vit-

John Lohmeyer wrote:
* From the T10 Reflector (t10@t10.org), posted by:
* John Lohmeyer <lohmeyer@t10.org>
*
Bill and George,

There was also a non-standard auto-termination scheme that some host adapters used to detect whether both its internal connector and external connector were connected to external termination. If both were terminated, the HBA would disable its own termination. This scheme depended on there being only one HBA. On each connector, the HBA sensed whether one of the ground lines was actually grounded or floating. This scheme would also work with LVD.

John

At 3/4/2008 01:00 PM, Penokie, George wrote:
  
* From the T10 Reflector (t10@t10.org), posted by:
* "Penokie, George" <George.Penokie@lsi.com>
*
Bill,

I can only assume you are referring to the LVD/MSE multimode termination
that was last defined in the SPI-4 standard as we never defined anything
else that could be called auto-termination. To find information on that
you need to get a copy of SPI-4 and look in section 7.4.1 LVD/MSE
multimode termination.


Bye for now, 
George Penokie

LSI Corporation 
3033 41st St. NW 
Suite 100 
Rochester, MN 55901

507-328-9017 
george.penokie@lsi.com


-----Original Message-----
From: owner-t10@t10.org [mailto:owner-t10@t10.org] On Behalf Of Schmitz,
Bill
Sent: Monday, March 03, 2008 2:56 PM
To: t10@t10.org
Subject: SCSI auto-termination

* From the T10 Reflector (t10@t10.org), posted by:
* "Schmitz, Bill" <Bill.Schmitz@lsi.com>
*
Anybody recall how auto-termination works or where I can find some
information about it?


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John Lohmeyer                  Email: lohmeyer@t10.org
LSI Corp.                      Voice: +1-719-533-7560
4420 ArrowsWest Dr.             Cell: +1-719-338-1642
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