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Parallel SCSI Interface Product Manual, Rev. A 105
4.5 Task management messages
Table 45 lists the codes used for messages that manage tasks. Details about these task management mes-
sages is given in subsections following the table.
4.5.1 Task management message codes
Table 45: Task management message codes
Key:
M = Mandatory support O = Optional support Q = Mandatory if tagged queuing is implemented
In = Target to initiator Out = Initiator to target
Yes = Initiator shall clear the attention condition before last ACK of the MESSAGE OUT phase.
Not required = Initiator may or may not clear the attention condition before last ACK of the MESSAGE OUT
phase (see Section
5.1).
N/A = Not applicable. The receiving SCSI device shall reject this message.
4.5.2 ABORT TASK
The ABORT TASK message is defined in the SCSI Architecture Model-4 standard.
In addition to the requirements in the SCSI Architecture Model-4 standard, the target shall go to the Bus Free
phase following the successful receipt of the ABORT TASK message.
If only an I_T nexus has been established, the target shall go to the Bus Free phase. No status or message
shall be sent for the current task and no pending data, status, or tasks are affected.
Note. The ABORT TASK message in the case of only an I_T nexus is useful to an initiator that is not able to
get an Identify message through to the target due to parity errors and just needs to end the current
task. Any pending data, status, or tasks for the I_T nexus are not affected. It is not possible to abort an
I_T nexus on a physical reconnection because of item (
f) in Section 5.1.
On a physical reconnection, the ABORT TASK message aborts the current task if it is fully identified. If the cur-
rent task is not fully identified (i.e., an I_T_L nexus exists, but the target is doing a physical reconnecting for an
I_T_L_Q nexus), then the current task is not aborted and the target goes to the BUS FREE phase.
Note. A nexus may not be fully identified on a physical reconnection if an attention condition is created dur-
ing the Identify message and the target has any tagged tasks for that initiator on that logical unit.
It is not an error to issue this message to an I_T_L or I_T_L_Q nexus that does not have any pending tasks.
Code
Support
Message name Direction
Clear attention
condition
IU Transfers Disabled IU Transfers Enabled
Initiator Target Initiator Target
0Dh Q Q M M
ABORT TASK
Out Yes
06h O M N/A N/A
ABORT TASK SET
Out Yes
16h O O N/A N/A
CLEAR ACA
Out Not required
0Eh Q Q N/A N/A
CLEAR TASK SET
Out Yes
17h M O N/A N/A
LOGICAL UNIT RESET
Out Yes
0Ch O M O M
TARGET RESET
Out Yes
- Parallel SCSI Interface 1
- Revision status summary sheet 5
- Table of Contents 7
- List of Figures 13
- 1.0 Interface requirements 15
- standards 16
- 1.4 Summary of SCSI messages 26
- 2.0 SCSI bus 27
- 2.1 SCSI bus signals overview 29
- 2.2 Signal states 31
- 2.3 OR-tied signals 32
- 2.4 Signal sources 33
- 2.5 SCSI bus timing 34
- 0 0.5 0 0.2 39
- induced time asymmetry 39
- due to resis 43
- 2.6 Measurement points 47
- 2.9 Data transfer modes 51
- 2.12 Negotiation 53
- PPR, SDTR Less than or equal 55
- 2.12.4 Transfer agreements 56
- Table 13: Transfer agreements 56
- bit shall be set to zero 61
- Transfer 62
- 3.0 Logical characteristics 65
- 3.2 SELECTION phase 69
- 3.3 RESELECTION phase 72
- 3.4 SCSI bus fairness 73
- 3.6 COMMAND phase 89
- 3.7 DATA phase 89
- 3.8 STATUS phase 90
- 3.9 MESSAGE phase 90
- 3.11 SCSI bus phase sequences 92
- 3.12 Data bus protection 95
- 4.2 Message formats 97
- 4.3 Message categories 99
- 7 6 5 4 3 2 1 0 101
- 0 IDENTIFY DISCPRIV LUN 101
- Target’s Parallel Protocol 109
- 4.4 Task attribute messages 116
- 4.5 Task management messages 119
- 5.1 Attention condition 121
- 5.2 Bus reset condition 122
- 5.3 Hard reset 122
- 5.4 Reset events 123
- 6.0 SPI information units 127
- [3] See Figure 16 129
- [4] See Figure 18 129
- [3] See Figure 18 130
- 6.2 SPI information units 132
- field shall be reserved 135
- field is not zero 135
- 129 143
- 7.0 SCSI commands 145
- See notes following Table 61 148
- 7.3 Status 152
- 7.4 Command examples 154
- 7.5 Timing examples 156
- 7.8 Parameter rounding 163
- 8.0 Drive features 165
- Command, Message, and Status 168
- (Bits 14 171
- Seagate Technology LLC 186
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