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M3099GX/GH OEM Manual 3-105
INTERFACE
An implied RESTORE POINTERS message shall be performed by
the initiator following successful identification of the nexus during
the MESSAGE IN phase of reconnection and before the negation of
the ACK signal for the next transfer following the successful
identification.
INITIATOR DETECTED ERROR (Init → Targ)
The INITIATOR DETECTED ERROR message is sent from an
initiator to inform a target that an error has occurred that does not
preclude the target from retrying the operation. The source of the
error may either be related to previous activities on the SCSI bus or
may be internal to the initiator and unrelated to any previous SCSI
bus activity. Although present pointer integrity is not assured, a
RESTORE POINTERS message or a disconnect followed by a
reconnect, shall cause the pointers to be restored to their defined
prior status.
MESSAGE PARITY ERROR (Init → Targ)
The MESSAGE PARITY ERROR message is sent from the initiator
to the target to indicate that it received a message byte with a parity
error (see ANSI SCSI-2 6.2.1).
In order to indicate its intentions of during this message, the initiator
shall assert the ATN signal prior to its release of the ACK signal for
the REQ/ACK handshake of the message byte that has the parity
error. This provides an interlock so that the target can determine
which message byte has the parity error. If the target receives this
message under any other circumstance, it shall signal a catastrophic
error condition by releasing the BSY signal without any further
information transfer attempt.
If after receiving the MESSAGE PARITY ERROR message the
target returns to the MESSAGE IN phase before switching to some
other phase, the target shall re-send the entire message that had the
parity error.
#03.pm5 98.2.22, 1:34 PM105