2 release unit command, Release unit command – FUJITSU M3093DG User Manual
Page 58

4.4.2
RELEASE UNIT command
The following table shows the normal sequence of the RESERVE UNIT command
when used with this scanner.
Step
Bus phase
Initiator operation
¨ Æ
Target operation
1
BUS FREE
Verifies bus free
2
ARBITRATION
Obtains bus>usage
right
3
SELECTION
Selects target
Æ
Drives BSY signal
4
MESSAGE OUT
Selects logical unit
Æ
5
COMMAND
Specifies
RELEASE UNIT
(CDB)
Æ
6
STATUS
¨
Reports GOOD status
7
MESSAGE IN
¨
Reports message (Command
Complete)
Releases BSY signal
8
BUS FREE
(1)
RELEASE UNIT command: COMMAND phase (initiator Æ target)
The RELEASE UNIT command releases a reserved status. If this command comes
from an initiator that has not declared reservation, the target ignores the command
and responds with the GOOD status (the reserved status is not released).
The CDB of this command is shown in the following illustration.
Byte 0
Operation code X©17π
2
3
4
5
TP
TPID
(Reserved)
(Reserved)
Control byte
1
7
6
5
4
3
2
1
0
Logical unit number
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