4-21
4.4.2 RELEASE UNIT command
The following table shows the normal sequence of the RESERVE UNIT command when used with this
scanner.
Table 4-9
RELEASE UNIT command
Step
Bus phase
Initiator operation
←
←→
→
Target operation
1
BUS FREE
Verifies bus free
2
ARBITRATION
Obtains bus-usage right
3
SELECTION
Selects target
→
Drives BSY signal
4
MESSAGE
Selects local unit
→
OUT
5
COMMAND
Specifies RELEASE
→
UNIT (CDB)
6
STATUS
←
Reports GOOD status
7
MESSAGE IN
←
Reports message (Command Complete)
Releases BSY signal
8
BUSFREE
4.4.2.1 RELEASE UNIT command: COMMAND phase (initiator
→
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.
7
6
5
4
3
2
1
0
Operation code X'17'
Logical unit number
TP
TPID
(Reserved)
(Reserved)
Control byte
(a) TP (third party): Byte 1
Byte 0
1
2
3
4
5
Summary of Contents for SCANPARTNER 600C
Page 1: ...Fujitsu ScanPartner 600C OEM Manual Version 1 0 Doc No 250 0081 0 Fujitsu Inc ...
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Page 5: ...v 5 3 4 Group 3 error flowchart no paper in ADF paper tray 5 5 ...
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