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
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> 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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