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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-211

Figure 4-116. All_commands Command Descriptor — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code

1 Reserved

2 – 3

(MSB)

Service Action

(LSB)

4 Reserved

5 Reserved ServActV

6 – 7

(MSB)

CDB Length

(LSB)

Table 4-124. All_commands Command Descriptor — Field Descriptions

Field Description

Operation

Code

The operation code of the returned command.

Service

Action

The service action of the returned command. If the command does not have service

actions, this field is set to 00h.

ServActV Service Action Valid. When set to 0, indicates that the returned command does not have

service actions and that the Service Action field should be ignored. When set to 1,

indicates that the returned command has service actions and that the Service Action field

contains valid information.

CDB Length Contains the length of the CDB indicated by the Operation Code and, if the ServActV bit

is set to 1, the Service Action fields.

1 2 ... 248 249 250 251 252 253 254 255 256 257 258 ... 293 294

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Quantum 1200 Series DAT Autochanger Guide de l'utilisateur Page 253