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Command Processing
1 - 2 C141-E167
Bit
Byte
76543210
0 Operation Code
1 LUN 00000
2 Logical Block Address (MSB)
3 Logical Block Address
4 Logical Block Address
5 Logical Block Address (LSB)
600000000
7 Transfer Data Length (MSB)
8 Transfer Data Length (LSB)
9 Control Byte
Figure 1.2 10-Byte CDB Basic Format
Bit
Byte
76543210
0 Operation Code
1 LUN 00000
2 Logical Block Address (MSB)
3 Logical Block Address
4 Logical Block Address
5 Logical Block Address (LSB)
6 Transfer Data Length (MSB)
7 Transfer Data Length (LSB)
8 Transfer Data Length (MSB)
9 Transfer Data Length (LSB)
1000000000
11 Control Byte
Figure 1.3 12-Byte CDB Basic Format
The meanings of each of the fields in the CDB are explained below. Depending on the type of
command, the basic format of the CDB, the definitions of fields and their meanings may differ.
Details are described in the specifications for each individual command in Chapter 3.