Scanner Interface
Appendix A-104
A.4.14 SCAN
The normal SCAN sequence for the scanner is as follows:
Step
Bus phase
Initiator operation
←
→
Target operation
1
Bus Free
Checks Bus Free
2
(Arbitration)
Acquires the right to
use the bus
3
Selection
Selects the target
→
Drives the BSY signal
4
(Message Out)
Selects the logical
device
→
5
Command
Specifies SCAN
(CDB)
→
Specifies reading
6
Data Out
Specifies the window
ID
→
7
Status
←
Reports the GOOD status
8
Message In
←
Reports message
(Command complete)
Releases the BSY signal
9
Bus Free
(1)
SCAN command: Command phase (Initiator to Target)
The SCAN command defines reading method for the scanner.
The command descriptor block (CDB) is as follows:
•
Transfer length: Byte 4
The transfer length specifies the number of bytes of window data sent during the DATA OUT
phase. A 0 means that no data is transferred. This is not an error.
Byte 0
1
2
3
4
5
Operation code X’1B’
Logical unit number
7
6
5
4
3
2
1
0
(Reserved)
Control byte
(Reserved)
Allocation length
Содержание M3097DG
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