Obsolete mixed command and data, mixed data and response
Giles Frazier
grf at us.ibm.com
Mon Nov 16 12:55:02 PST 1998
* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* Giles Frazier <grf at us.ibm.com>
*
Bob: I agree with your proposal and with the revisions you plan to make, but I
have one comment on the revision for section 7.1, which I believe currently has
an error:
Since the last sentence of section 7.1 starts with the phrase "in all other
cases," it implies that unless BOTH XFER_RDY IUs are disabled AND Command/Data
Mixed is allowed, then the FCP_CMND IU must transfer sequence initiative.
Actually, if XFER_RDY IUs are disabled but Command/Data Mixed is NOT allowed,
then the FCP_CMND IU for a write should NOT transfer sequence initiative.
Instead, the FCP_CMND IU should be immediately followed by the first or only
FCP_Data burst. (This is required by sections 6.2.6.13 and 7.2.)
Therefore, when section 7.1 is revised, it needs to be reworded so that when
XFER_RDY IUs are disabled, the FC_CMND IU for a write operation does not
transfer sequence initiative and is followed by an FCP_Data IU containing the
first or only FCP_Data burst which transfers sequence initiative.
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