Commands Terminated After Post Error; Bus Parity Error Handling - Tandberg Data SLR7-140 PROGRAMMER Manual

Tandberg Data
If the command is successfully executed and terminated
with OK STATUS, a subsequent REQUEST SENSE command will
return NO SENSE.
If the Selftest(s) failing during Power On also is part
of the SEND DIAGNOSTICS
expected to fail during the SEND DIAGNOSTICS execution
as well, and thus the command will terminate with CHECK
CONDITION. A subsequent
return Sense Data according to the previously detected
POST failure.
If the Selftest(s)
included in an issued SEND DIAGNOSTICS sequence, the
SEND DIAGNOSTICS
errors are detected.
7.5.2.

Commands Terminated After POST Error

All commands other then those mentioned in 7.5.1. issued
after detection of a POST error will be terminated with
CHECK CONDITION each time (not only the first time!)
they are issued. A subsequent REQUEST SENSE command will
return sense data according to the last failed Selftest
in the POST sequence.
7.6.

Bus Parity Error Handling

The Drive checks the state of the Bus Parity Error
Jumper during Power- Up/Reset initialization. Depending
on the state of this jumper, bus parity error checking
is either globally enabled or disabled.
The Drive supports re-transfer of commands, status, data
and messages.
When bus parity error checking is enabled, the Drive
will check for bus parity errors during transfer of
Command Descriptor Blocks, Data Out and Message Out. In
addition the Drive
INITIATOR DETECTED ERROR or MESSAGE PARITY error message
is received.
The Drive is able to limit the number of retransfer
attempts, which will be performed upon continued parity
error detection. This number may be configured by the
host (using the Bus Parity Error Retries field in the
Miscellaneous Page
procedures described below will be repeated until the
error condition has vanished or the maximum number of
retries is reached. If the maximum number of retries is
reached, the command will be terminated
If the Bus Parity Error Retry count field has been set
to zero, no retries are performed. In this case the
command is terminated immediately
Commands terminated either with CHECK CONDITION or an
Unexpected Bus Free Condition. In the first case the
error code generated will be
DETECTED ERROR MESSAGE RECEIVED
7-9 Tandberg SLR Product Line SCSI Functional Specifications
sequence,
REQUEST
failing during
will return OK
retries the
of Mode Select).
SCSI PARITY ERROR
.
General Exception Handling
this Selftest
SENSE command
Power On is
STATUS if no other
last phase when
The retransfer
or I
NITIATOR
is
will
not
an