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Step
3
SELECTION
4
MESSAGE
OUT
5
COMMAND
6
STATUS
7
MESSAGE
IN
8
BUSFREE
4.4.5.1
SEND DIAGNOSTIC command: COMMAND phase (initiator
The SEND DIAGNO~C command is used by an initiator to request a target or local unit for self-test. Two types of self-
diagnostic are: (a) the selftest performed by the unit itself, and (b) the test conducted according to the instruction data
from the initiator.
This scanner supports the self-test only.
The results of self-test are reported using the status and sense da~
The CDB of this command is shown in the following illustration.
Byte 0
1
2
3
(MSB)
4
5
(a) PF (page format): Byte 1
This scanner ignores PF.
(b) SLFTST (selftest): Byte 1
Specifies the self-test done by the unit itself. This value is 1 on this scanner.
Table 4.14 SEND DIAGNOSTIC command
Bus phase
Initiator operation
Selects target
Selects logical unit
Specifies SEND
DIAGNOSTIC
(CDB)
7
6
Logical unit number
← ← → →
→ →
Drives BSY signal
→ →
→ →
Performs self-test
← ←
Reports GOOD status
← ←
Reports message (Command Complete)
Releases BSY signal
4
3
5
Operation code X'1D'
PF
(Reserved)
Reserved
Parameter list length
Control byte
4-30
Target operation
→ →
target)
2
1
DO
UO
SLFTST
(LSB)
0
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