4.4.3HEAD OF QUEUE

See Table 42 for the format of the Head of Queue message.

Table 42: Head of Queue message format

Bit

7

6

5

4

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

MESSAGE CODE (21h)

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

TAG (00h-FFh)

 

 

 

 

 

 

 

 

 

 

 

 

The Head of Queue message specifies that the task shall be placed in the task set as a Head of Queue task. The rules used by the device server to handle Head of Queue tasks within a task set are defined in Section 7.0 of this manual and in the SCSI Architecture Model-2 standard.

4.4.4ORDERED

See Table 43 for the format of the Ordered message.

Table 43: Ordered message format

Bit

7

6

5

4

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

MESSAGE CODE (22h)

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

TAG (00h-FFh)

 

 

 

 

 

 

 

 

 

 

 

 

The Ordered message specifies that the task shall be placed in the task set as an Ordered task. The rules used by the task manager to handle Ordered tasks within a task set are defined in Section 7.0 of this manual and in the SCSI Architecture Model-2 standard.

4.4.5SIMPLE

See Table 44 for the format of the Simple message.

Table 44: Simple message format

Bit

7

6

5

4

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

MESSAGE CODE (20h)

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

TAG (00h-FFh)

 

 

 

 

 

 

 

 

 

 

 

 

The Simple message specifies that the task shall be placed in the task set as a Simple task. The rules used by the task manager to handle Simple tasks within a task set are defined in Section 7.0 of this manual and in the SCSI Architecture Model-2 standard.

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Parallel SCSI Interface Product Manual, Rev. A

Page 118
Image 118
Seagate Ultra 320, Ultra 160 manual Head of Queue, Ordered