[t13] T10/04-262r0

Jeff Garzik jgarzik at pobox.com
Thu Aug 12 16:15:28 PDT 2004


* From the T10 Reflector (t10 at t10.org), posted by:
* Jeff Garzik <jgarzik at pobox.com>
*
Jeff Garzik wrote:
> Curtis Stevens wrote:
>> I also do not believe the transport can be separated from the CDB because
>> this has the transfer length in addition to the direction.  While I could
>> place the protocol field in the CDB, there is no room for the length.  
>> The
>> ATA host also needs this information to properly complete a PIO transfer.
>> For DMA transfers, this information may also be necessary for buffer size
>> allocation, although some implementations could do it without buffers.
> 
> 
> Er, huh?
> 
> Every ATA read/write command specifies transfer length and data 
> direction already.  No need to store or derive that information elsewhere.


Ah, for vendor-reserved commands, yes it would need specification.

	Jeff


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