SCSI Commands

5.1.2 Command Descriptor Block

An initiator communicates with the drive by sending a 6- or 10-byte Command Descriptor Block that contains the parameters for the specific command. The SCSI command's operation code is always the first byte in the Command Descriptor Block and a control field is the last byte. For some commands, the Command Descriptor Block is accompanied by a list of parameters sent during the DATA OUT phase. Figure 5–1 shows the format of a typical 6-byte Command Descriptor Block. Table 5–2 contains a description of the Command Descriptor Block fields.

Bit

7

 

6

 

5

4

 

3

 

2

 

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

Operation Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(MSB)

 

 

 

 

 

1

 

Logical Unit Number

 

 

 

 

 

Logical Block Address

 

 

 

 

 

(LUN)

 

 

 

 

 

 

(LBA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 - 3

 

 

 

 

 

 

 

Logical Block Address

 

 

 

 

 

 

 

 

 

 

(LBA)

 

 

 

 

(LSB)

4

Transfer Length, Parameter List Length, or Allocation Length

5

Control

NOTE: Unless otherwise specified, all reserved bits indicated in the commands are 0.

Figure 5–1 Typical Command Descriptor Block - Data Format

5-4

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Command Descriptor Block, Msb, Lba Lsb
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DLT 7000 specifications

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