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154 Parallel SCSI Interface Product Manual, Rev. A
Table 66: Self-test mode summary
8.3 Alternate error detection for the asynchronous information phases (AIP)—
Command, Message, and Status
8.3.1 Error detection for asynchronous information phases
This section describes an enhanced error detection method for the Command, Message, and Status asynchro-
nous information transfer phases. In systems not implementing this scheme, these phases only transfer infor-
mation on the lower eight data bits of a SCSI bus with only normal parity protection on those transfers.
Therefore, additional check information can be transferred on the upper eight data bits in order to improve error
detection capabilities. Since the upper eight data bits of the bus are used for this scheme, this error detection
method is only available on wide SCSI devices that are on wide SCSI busses.
8.3.2 Protection code
The following are the covered signals to be encoded and details of the protection code to be used on the asyn-
chronous information phases.
Mode
When
status is
returned
How to abort
the self-test
Processing of subsequent
commands while self-test is
executing Self-test failure reporting
Foreground After the
self-test is
complete
Abort Task task
management
function
If the command is INQUIRY, REPORT
LUNS, or REQUEST SENSE,
process normally. Otherwise,
terminate with CHECK CONDITION
status, Not Ready sense key, and
Logical Unit Not Ready, Self-Test In
Progress additional sense code.
Terminate with CHECK CONDITION
status, Hardware Error sense key,
and Logical Unit Failed Self-Test or
Logical Unit Unable To Update Self-
Test Log additional sense code.
Background After the
CDB is
validated
SEND DIAG-
NOSTICs com-
mand with Self-
Test Code field
set to 100b
Process the command, except as
described in Seagate SCSI Command
Reference Manual, Part number
100293068.
Application client checks Self-test
results log page after the Progress
Indication field returned from
REQUEST SENSE indicates the self-
test is complete.