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5.3 Host Commands
C141-E050-02EN 5-53
At command issuance (I/O registers setting contents)
1F7
H
(CM)
X’98’ or X’E5’
1F6
H
(DH)
× × ×
DV
xx
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
xx
xx
xx
xx
xx
At command completion (I/O registers contents to be read)
1F7
H
(ST)
Status information
1F6
H
(DH)
× × ×
DV
xx
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(ER)
xx
xx
xx
X’00’ ,X’80’ or X’FF’
Error information
(27) SMART (X’B0)
This command performs operations for device failure predictions according to a
subcommand specified in the FR register. If the value specified in the FR register
is supported, the Aborted Command error is posted.
It is necessary for the host to set the keys (CL = 4Fh and CH = C2h) in the CL
and CH registers prior to issuing this command. If the keys are set incorrectly, the
Aborted Command error is posted.
In the default setting, the failure prediction feature is disabled. In this case, the
Aborted Command error is posted in response to subcommands other than
SMART Enable Operations (FR register = D8h).
When the failure prediction feature is enabled, the device collects or updates
several items to forecast failures. In the following sections, note that the values of
items collected or updated by the device to forecast failures are referred to as
attribute values.