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142 Parallel SCSI Interface Product Manual, Rev. A
7.5 Timing examples
Times (T00 through T35) necessary to define performance are listed in the individual drive’s Product Manual,
in the “Disc drive SCSI timing” section. For timing waveforms to define these times, refer to the SCSI Parallel
Interface-5 specification (SPI-5).
7.6 Command processing considerations and exception conditions
The following clauses describe some exception conditions and errors associated with command processing
and the sequencing of commands.
7.6.1 Auto Contingent Allegiance or Contingent Allegiance
The auto contingent allegiance (NACA=1, see Section 7.2.1, note [7], Table 62) or contingent allegiance
(NACA=0) condition shall exist within the task set when the logical unit completes a command by returning a
CHECK CONDITION status (see Section
7.3).
7.6.1.1 Logical Unit response to Auto Contingent Allegiance or Contingent Allegiance
The auto contingent allegiance (NACA=1, see Section 7.2.1, note [7], Table 62) or contingent allegiance
(NACA=0) condition shall not cross task set boundaries and shall be preserved until it is cleared as described
in Section
7.6.1.2. If requested by the application client and supported by the protocol and logical unit, sense
data shall be returned as described in Section 7.6.4.2.
Note. The SCSI-2 contingent allegiance condition has had an alternate added and the extended contingent
allegiance condition has been replaced in SCSI-3 (now called merely “SCSI”) by auto contingent alle
-
giance in conjunction with the NACA bit.
Note. If the SCSI-3 protocol does not enforce synchronization of client/server states, there may be a time
delay between the occurrence of the auto contingent allegiance or contingent allegiance condition and
the time at which the initiator becomes aware of the condition.
After sending status and a service response of Task Complete, the logical unit shall modify the state of all tasks
in the faulted task set as described in SCSI Architecture Model-4 (SAM-4), T10/1683-D, “Task Set Manage
-
ment.”
A task created by the faulted initiator while the auto contingent allegiance condition is in effect may be entered
into the faulted task set under the conditions described below.
As described in Section 7.2.1, note [7], Table 62, the setting of the NACA bit in the Control byte of the faulting
command CDB determines the rules that apply to an ACA or CA condition caused by that command. If the
NACA bit was set to zero the SCSI-2 contingent allegiance rules shall apply.
If the NACA bit was set to one in the Control byte of the faulting command, then a new task created by the
faulted initiator while the ACA condition is in effect shall not be entered into the faulted task set unless all of the
following conditions are true:
a. The task has the ACA attribute; and
b. No other task from the faulted initiator having the ACA attribute is in the task set.
If the task is from the faulted initiator and any of the conditions listed above are not met, the newly created task
shall not be entered into the task set and shall be completed with a status of ACA Active.
If a task having the ACA attribute is received and no auto contingent allegiance condition is in effect for the task
set or if the NACA bit was set to zero in the CDB for the faulting command (i.e., a contingent allegiance condi
-
tion is in effect), then the ACA task shall be completed with a status of Check Condition. The sense key shall
be set to ILLEGAL REQUEST with an additional sense code of Invalid Message Error. As noted in Section
7.2.1, note [7], Table 62, any existing contingent allegiance condition shall be cleared and a new auto contin-
gent allegiance (NACA=1) or contingent allegiance (NACA=0) condition shall be established.
- 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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