Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 50)

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Byte 05 - Control Byte

The Vendor Unique portion of the Control byte is defined for each

specific command, if used. The CTS does not support linked

commands or recognize the Flag bit. The following are the field

definitions for the Control byte:

Bits 7 and 6 - Vendor Unique Command unique.

Bits 5 through 2 - Reserved These bits are reserved.

Bit1-Flag Not used, must be 0.

Bit0-Link Not used, must be 0.

Field Definitions for Ten-Byte CDBs

The following are the definitions of the fields shown for the ten-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 05 - Logical Block Address

These bytes are used as defined in the specific commands.

2-10

EXB-8205 and EXB-8505

(Standard and XL)

510503

2 SCSI Communication

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 445 446

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