Interface
5-58 C141-E088-01EN
Table 5.7 Features Register values (subcommands) and functions (1 of 3)
Features Resister
Function
X’D0’
SMART Read Attribute Values:
A device that received this subcommand asserts the BSY bit and saves all
the updated attribute values. The device then clears the BSY bit and
transfers 512-byte attribute value information to the host.
*
For infomation about the format of the attribute value information, see
Table 5.8.
X’D1’
SMART Read Attribute Thresholds:
This subcommand is used to transfer 512-byte insurance failure threshold
value data to the host.
*
For infomation about the format of the insurance failure threshold value
data, see Table 5.9.
X’D2’
SMART Enable-Disable Attribute AutoSave:
This subcommand is used to enable (SC register
≠
00h) or disable (SC
register = 00h) the setting of the automatic saving feature for the device
attribute data. The setting is maintained every time the device is turned off
and then on. When the automatic saving feature is enabled, the attribute
values are saved before the device enters the power saving mode. However,
if the failure prediction feature is disabled, the attribute values are not
automatically saved.
When the device receives this subcommand, it asserts the BSY bit, enables
or disables the automatic saving feature, then clears the BSY bit.
X’D3’
SMART Save Attribute Values:
When the device receives this subcommand, it asserts the BSY bit, saves
device attribute value data, then clears the BSY bit.
X’D4’
SMART Executive Off-line Immediate:
A device which receives this command asserts the BSY bit, then starts
collecting the off-line data specified in the SN register, or stops.
In the off-line mode, after BSY is cleared, off-line data are collected. In the
captive mode, it collects off-line data with the BSY assertion as is, then
clears the BSY when collection of data is completed.
SN Off-line data collection mode
00h: Off-line diagnosis (off-line mode)
01h: Simple self test (off-line mode)
02h: Comprehensive self test (off-line mode)
7Fh: Self test stop
81h: Simple self test (captive mode)
82h: Comprehensive self test (captive mode)