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M3099GX/GH OEM Manual
The supported extended message by this scanner is
SYNCHRONOUS DATA TRANSFER only.
The first message sent by the initiator after the SELECTION phase
shall be an IDENTIFY, ABORT, or BUS DEVICE RESET message.
If a target receives any other message it shall go to BUS FREE
phase.(see unexpected disconnect ANSI SCSI-2 6.1.1)
If the first message is an IDENTIFY message, then it may be
immediately followed by other messages, such as the first of a pair of
SYNCHRONOUS DATA TRANSFER REQUEST messages. The
IDENTIFY message establishes a logical connection between the
initiator and the specified logical unit or target routine within the
target known as an I_T_L nexus to be re-established. Only one
logical unit shall be identified for any connection; if a target receives
a second shall go to BUS FREE phase (see unexpected disconnect
ANSI SCSI-2 6.1.1). The treatment of other logical unit addressing
errors is described in ANSI SCSI-2 7.5.
Whenever an I_T_L nexus is established by an initiator that is
allowing disconnection, the Initiator shall ensure that the current
pointers are equal to the saved pointers for that particular logical unit
or target routine. An implied restore pointers operation shall occur as
a result of a reconnection.
ABORT (Init
→
Targ)
The ABORT message is sent from the initiator to the target to clear
any I/O process for the I_T_x nexus. The target shall go to the BUS
FREE phase following successful receipt of this message. The
pending data, status, and I/O processes for any other nexus shall not
be cleared.
Previously established conditions, including MODE SELECT
parameters, reservations, and extended contingent allegiance shall
not be changed by the ABORT message.
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