Seagate Ultra 320 User Manual download pdf (Page 152)

138 Parallel SCSI Interface Product Manual, Rev. A

7.3 Status

A Status byte shall be sent from the target to the initiator during the STATUS phase at the termination of each

command as specified in Tables

63 and 64 unless the command is cleared by one of the following conditions:

1. an Abort message

2. a Bus Device Reset message

3. a hard reset condition

4. an unexpected Bus Free condition (see Section 3.1.1)

5. an ABORT TASK message

6. a CLEAR TASK SET message

Table 64: Status byte code bit values

[1] What was formerly called a “Command Queue” is now called a “Task Set.”

[2] Formerly “Command Terminated.”

A description of the status byte codes is given below.

Good. This status indicates that the Device Server has successfully completed the task.

Check Condition. This status indicates that an auto contingent allegiance or contingent allegiance condition

has occurred (see Section

7.6.1). Optionally, autosense data may be delivered (see Section 7.6.4.2).

Condition Met. This status shall be returned whenever the requested operation specified by an unlinked

command is satisfied (see the PREFETCH commands in ANSI SCSI Block Commands-2, T10/1417D).

Table 63: Status byte

Bit

Byte

7 6 5 4 3 2 1 0

Reserved STATUS BYTE CODE Reserved

Status byte Status represented Task Ended

00h

Good Yes

02h

Check Condition Yes

04h

Condition Met/Good Yes

08h

Busy Yes

10h

Intermediate/Good No

14h

Intermediate/Condition Met No

18h

Reservation Conflict Yes

22h

Obsolete [2] Yes

28h

Queue Full/Task Set Full [1] Yes

30h

ACA Active Ye s

40h

Task Aborted Yes

All other codes

Reserved

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 185 186

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