Seagate Ultra 160 Product Manual page 134

Table 47: Task Attribute
Codes Description
Requests that the task be managed according to the rules for a simple task attribute. See the
000b
Architecture Model-4 standard
Requests that the task be managed according to the rules for head of queue task attribute. See the
001b
SCSI Architecture Model-4 standard
Requests that the task be managed according to the rules for an ordered attribute. See the
010b
Architecture Model-4 standard
011b
Reserved.
Requests that the task be managed according to the rules for a simple task attribute. See the
100b
Architecture Model-4 standard
101b-111b Reserved.
[2] The Task Management Flags field is defined in Table 48. If a Task Management function fails, the Task
Manager shall terminate the task with Good status. The packetized failure code shall be set to Task Man-
agement Function Failed.
Table 48: Task Management flags
Codes Description
00h Indicates no task management requests for the current task.
01h The task manager shall abort the task as defined in the ABORT TASK message (see Section 4.5.2).
02h The task manager shall abort the task set as defined in the ABORT TASK SET message (see Section
4.5.3).
04h The task manager shall clear the task set as defined in the CLEAR TASK SET message (see Section
4.5.5).
08h The task manager shall perform a hard reset to the selected logical unit as defined in the LOGICAL UNIT
RESET message (see Section 4.5.6).
20h The task manager shall perform a hard reset as defined in the TARGET RESET message (see Section
4.5.7).
40h The task manager shall perform a clear ACA as defined in the CLEAR ACA message (see Section 4.5.4).
All other The task manager shall terminate the task with a Good status. The packetized failure code shall be set to
values Task Management Function Not Supported.
reserve
d
[3] The Additional CDB Length field contains the length in 4-byte words of the Additional CDB field.
[4] The Write Data (WRDATA) bit and READ Data (RDDATA) bit are defined in SCSI protocol standards T10/
1144D (FCP-2), sections 9.1, 9.1.16, and 9.1.17. They are also discussed in the Seagate Fibre Channel
Interface Manual, part number 77767496. These two bits are used by drives in a Fibre Channel I/O sys-
tem and shall be ignored by this section.
[5] The CDB field contains the actual CDB to be interpreted by the addressed logical unit. The maximum
CDB length is 16 bytes. The CDB field and the task attribute field is not valid and is ignored if the Task
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Parallel SCSI Interface Product Manual, Rev. A
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