Wide or Narrow?

Gil Romo gil.romo at qlogic.com
Thu Aug 26 16:41:46 PDT 2004


* From the T10 Reflector (t10 at t10.org), posted by:
* Gil Romo <gil.romo at qlogic.com>
*
Greetings Scott,

After the WDTR, the transfer mode is async, wide.
After the PPR, the transfer mode is DT-160, wide.  The width parameter in the 
PPR message overrides the previous setting.
After the SDTR, the transfer mode is ST-80, wide (still; it has no effect on the 
width).

Your example is not realistic.  A PPR supercedes the WDTR/SDTR combination.

What is your concern regarding SCSI commands?

Gil

> X-Authentication-Warning: t10.org: lohmeyer set sender to owner-t10 at t10.org 
using -f
> Subject: Wide or Narrow?
> To: t10 at t10.org
> From: SSchmitz at attotech.com
> Date: Thu, 26 Aug 2004 12:49:15 -0400
> 
> * From the T10 Reflector (t10 at t10.org), posted by:
> * SSchmitz at attotech.com
> *
> 
> Consider three SCSI commands preceeded by the following negotiation:
> 
> 1.  Async Narrow using the WDTR message (message bytes: 01 02 03 00).
> 2.  Sync DT 160 using the PPR message (message bytes: 01 06 04 09 00 3E 01
> 02).
> 3.  Sync ST 80 using the SDTR message (message bytes: 01 03 01 0A 1F).
> 
> At this point, is the bus wide or narrow?  In other words, should separate
> states be maintained for PPR vs. WDTR/SDTR negotiation implying that the
> bus is narrow or should one state be maintained implying that the bus is
> wide?
> 
> -Scott Schmitz
> 
> 
> *
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------------
Gilbert Romo
Circuits & Integration
QLogic Corporation, Aliso Viejo, California
Office: 949-389-6266
E-mail: gil.romo at qlogic.com

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