Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 49)

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2.4 Field Definitions for the Command

Descriptor Block

The following sections provide field definitions for the six- and

ten-byte command descriptor blocks (CDB).

Field Definitions for Six-Byte CDBs

The following are the definitions of the fields shown for the six-byte

CDB.

Byte 00 - Operation Code

The Operation Code consists of two subfields, the Group Code and

the Command Code, which are defined as follows:

Bits 7 through 5 - Group Code The Group Codes supported by the

CTS are defined by the specific command.

Bits 4 through 0 - Command Code The Command Codes

supported by the CTS are defined by the specific command.

Byte 01, Bits 7 through 5 - Logical Unit Number (LUN)

The LUN designates a specific unit within a group of devices

associated with the target. Since the CTS is a single device target and

does not support multiple devices, the LUN must be 0 for all

commands.

Byte 01, Bits 4 through 0 - Command Dependent

These bits are used as defined in the specific commands.

Bytes 02 through 04 - Logical Block Address

These bytes are used as defined in the specific commands.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

2-9

2 SCSI Communication

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 445 446

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Exabyte EXB-8205 Instruções de Operação Página 49

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