Command Descriptor Block; Table 6-1 6-Byte Command Descriptor Block; Table 6-2 10-Byte Command Descriptor Block; Table 6-3 12-Byte Command Descriptor Block - Sun Microsystems storagetek sl500 Reference Manual

Implementation Requirements

Command Descriptor Block

Initiators use three types of CDBs to communicate commands to the targets:
6–Byte commands
■
10–Byte commands
■
12-Byte commands
■
The first byte in the command descriptor block contains an operation code.

TABLE 6-1 6-Byte Command Descriptor Block

Byte 7
0 Group Code
1 Reserved
2–4
5

TABLE 6-2 10-Byte Command Descriptor Block

Byte 7
0
1 Reserved
2–8
9

TABLE 6-3 12-Byte Command Descriptor Block

Byte 7
0
1 Reserved
2–9
10
11
86 SL500: Interface Reference Manual • July 2008
(TABLE 6-1)
(TABLE 6-2)
(TABLE 6-3)
6 5 4
Command Parameters
Control Byte
6 5 4
Operation Code
Command Parameters
Control Byte
6 5 4
Operation Code
Command Parameters
Control Byte
Bit
3 2
Command Code
Command Parameters
Bit
3 2
Command Parameters
Bit
3 2
Command Parameters
Reserved
1 0
1 0
1 0
Revision: F • 96122