17 Mar
2006
17 Mar
'06
1:32 p.m.
On Thu, 16 Mar 2006 18:28:09 -0000
"Antonio Carlini" <a.carlini at ntlworld.com> wrote:
Interresting. I did not know this. Now I remember. I
have two PCI DSSI
adapters that are based on the NCR / Symbios 53C825 Wide SCSI chip. But
what I had in mind when I wrote the above was...
that DSSI supports SCA. That is more
remarkable then the physical layer.
Sorry for the confusion. I refered to the protocol / software features
and ignored the physical specifications.
DSSI is not
even loosely related to SCSI.
The DSSI spec (or the nearest thing I have to it)
says otherwise.
The physical layer (bus signals, low level protocol, bus
phases etc.) are all either taken directly from SCSI or are
a slightly modified version. SCSI is a mass
storage interface where DSSI is more some kind of a
SAN.
DSSI certainly supports SCA but if you look at the SII I'm
sure you'll find that it can do both SCSI and DSSI. I'd be
even more sure if I had an SII spec.
AFAIK SSI is a very dump device that mostly
does only PIO. So everything
else is done in software.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/