Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 51)

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101

Byte 06 - Reserved

This byte is reserved.

Bytes 07 and 08 - Transfer, Parameter List, or Allocation

Length

These bytes contain the transfer length, the parameter list length, or

the allocation length as required by the specific command.

Byte 09 - 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 These bits are command unique.

Bits 5 through 2 - Reserved These bits are reserved.

Bit1-Flag Thisbitisnotsupportedandmustbe0.

Bit0-Link Thisbitisnotsupportedandmustbe0.

2.5 Command Format Errors

A command format error may occur when:

The Operation Code in the CDB is not supported by the CTS.

The Logical Unit Number in the CDB is not 0.

The bytes or bits in a Reserved field (as defined by the ANSI

SCSI-2 standard) are not 0.

The Link or Flag fields of the Control byte (bits 1 and 0) are not 0,

or the Vendor Unique fields (bits 7 and 6) are not valid definitions

for the specific command.

For all command format errors, the command is terminated and

Check Condition status is returned to the initiator. The sense data is

set as follows:

The sense key is set to Illegal Request (5h)

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

2-11

2 SCSI Communication

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