Fujitsu MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES specifications Byte CDB Basic Format

Bit	7	6	5	4	3	2	1	0
Byte
0				Operation Code
1		LUN		0	0	0	0	0
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)
10	0	0	0	0	0	0	0	0
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.

(1)Operation code

Bit 7		6	5	4	3		2	1	0
	Group Code					Command Code

The leading byte of all CDBs shows the format and type of command to be executed.

a.Group code

The group code specifies the number of bytes and format of the CDB. The groups of commands shown below are used in the IDD.

ξGroup 0 (“000”):6-byte CDB (Shown in Figure 1.1)

ξGroup 1 (“001”):10-byte CDB (Shown in Figure 1.2)

ξGroup 2 (“010”):10-byte CDB (Shown in Figure 1.2)

ξGroup 3 ("011"):Reserved Operation Code (Shown in Section 1.7.3.)

ξGroup 4 ("100"):16-byte CDB

ξGroup 5 ("101"):12-byte CDB (Shown in Figure 1.3)

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