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Scanner Interface
Appendix A-94
A.4.12 MODE SELECT (6)
The normal sequence related to MODE SELECTE (6) of this scanner is listed below:
Step Bus phase Initiator operation
Target operation
1 Bus Free Checks Bus Free
2 Arbitration Acquires right to use
the bus
3 Selection Selects the target
Outputs the BSY signal
4 Message out
Selects the logical
device
5 Command Specifies MODE
SELECT (6) (CDB)
Sets up mode data
6 Data In Specifies MODE
SELECT parameter
data
7 Status
Reports the GOOD status
8 Message In
Reports Command
Complete
Releases the BSY signal
9 Bus Free
(1) MODE SELECT (6) command: Command phase (Initiator to Target)
This command is used to set up miscellaneous parameters in peripheral devices.
CDB of this command is shown below:
Byte 0
1
2
3
4
5
Operation code X’15’
Logical unit number
(Reserved)
7
6
5
4
3
2
1
0
PF
(Reserved)
SP
Parameter list length
Control byte