Enabling ECP...

Mike Kosco Mike at ChipCraft.com
Wed Aug 29 16:09:34 PDT 2001


* From the T10 Reflector (t10 at t10.org), posted by:
* Mike Kosco <Mike at ChipCraft.com>
*
>From SPI-4 rev06, annex G:

G.4 Enabling ECP
Following a hard reset (see 12.4), a communicative expander shall
function as a simple expander for each
initiator until the initiator enables ECP as follows:
1) negotiate asynchronous transfer mode and a transfer width of 8 bits
to some target; and
2) issue a WRITE BUFFER command to that same target with the MODE field
set to echo buffer plus
enable ECP (see SCSI Primary Commands-2 standard).

What does "plus enable ECP" mean?  I believe ecp is enabled by

1) negotiate asynchronous transfer mode and a transfer width of 8 bits
to some target; and
2) issue a WRITE BUFFER command to that same target with the MODE field
set to echo buffer, and
3) issue  echo buffer write data with an expander function header
containing the expander signature followed by SEDB(s)/LEDB... etc

Am I missing something here?,

thanks again & regards,
-
Mike Kosco
ForSale:SPI-4 expander core...
Chip Craft Corp.
(949) 633-8383
www.ChipCraft.com

*
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org




More information about the T10 mailing list