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Command Descriptor Block
68
T10000: Interface Reference Manual • January 2011
• E20425-01
■
Command Descriptor Block
Initiators use three types of CDBs to communicate commands to the targets:
•
)
•
10–Byte commands (
)
•
12-Byte commands (
The first byte in the command descriptor block contains an operation code.
Table 37. 6-Byte Command Descriptor Block
Byte
Bit
7
6
5
4
3
2
1
0
0
Operation Code
1
Reserved Command
Parameters
2
thru
4
(MSB)
Command Parameters
(LSB)
5
Control Byte
Table 38. 10-Byte Command Descriptor Block
Byte
Bit
7
6
5
4
3
2
1
0
0
Operation Code
1
Reserved Command
Parameters
2
thru
8
(MSB)
Command Parameters
(LSB)
9
Control Byte
Table 39. 12-Byte Command Descriptor Block
Byte
Bit
7
6
5
4
3
2
1
0
0
Operation Code
1
Reserved Command
Parameters
2
thru
9
(MSB)
Command Parameters
(LSB)
10
Reserved
11
Control Byte
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