3-2.1 Abort Code 06H; 3-2.2 Bus Device Reset Code 0Ch; 3-2.3 Command Complete Code 00H; 3-2.4 Disconnect Code 04H - Fujitsu M2488 Product Manual

SCSI MESSAGES
CODE MESSAGE
0Ch BUS DEVICE RESET
23h IGNORE WIDE RESIDUE
80h-
IDENTIFY
FFh
3-2.1 ABORT code 06h
This message is sent from the initiator to the target to clear the present operation.
If a logical unit has been identified, all pending data and status for the issuing initiator from the
affected logical unit are cleared, and the target goes to the BUS FREE phase. Pending data and status
for other initiators are not cleared. If a logical unit is not identified, the target goes to the BUS FREE
phase. No status or ending message is sent for the operation. It is not an error to issue this message to
a logical unit that is not currently performing an operation for the initiator.
3-2.2 BUS DEVICE RESET code 0Ch
This message is sent from an initiator to direct a target to clear all current commands on that SCSI
device.
This message forces the SCSI device to an initial state with no operations pending for any initiator.
Upon recognizing this message, the target goes to the BUS FREE phase.
3-2.3 COMMAND COMPLETE code 00h
This message is sent from a target to an initiator to indicate the execution of a command or a series of
linked commands has terminated and valid status was sent to the initiator.
After successfully sending this message, the target goes to the BUS FREE phase by releasing BSY.
The target considers the message transmission to be successful when it detects the negation of ACK
for the COMMAND COMPLETE message with the ATN signal false.
The command may have been executed successfully or unsuccess-
fully as indicated in the status.
3-2.4 DISCONNECT code 04h
This message is sent from a target to inform the initiator that the present physical path is going to be
broken (the target plans to disconnect by releasing BSY), but a later reconnect is required in order to
complete the current operation.
This message does not cause the initiator to save the data pointer. After successfully sending this
message, the target goes to the BUS FREE phase by releasing BSY. The target considers the message
transmission to be successful when it detects the negation of ACK for the DISCONNECT message
with the ATN signal false.
3-2
Table 3-1. M2488 SCSI Messages (Continued)
Directs the target to clear all current commands
on that SCSI device.
Sent to an initiator to indicate the number of
valid bytes sent during the last REQ/ACK hand-
shake and REQB/ACKB handshake of a DATA
IN phase is less than the negotiated transfer
width.
Sent to establish the physical path connection
between an initiator and target for a particular
logical unit.
** NOTE **
CG00000-011503 REV. A
M2488 PRODUCT GUIDE
DESCRIPTION PARAGRAPH
3-2.2 on page 3-2
3-2.7 on page 3-7
3-2.6 on page 3-7
April 1997