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11 S.M.A.R.T Functionality
The C-4x0 CF cards support the following SMART commands, determined by the Feature Register value.
Table 111: S.M.A.R.T. Features Supported
Feature
D0h
D1h
D2h
D8h
D9h
DAh
Operation
SMART Read Data
SMART Read Attribute Thresholds
SMART Enable/Disable Attribute
SMART Enable Operations
Autosave SMART Disable Operations
SMART Return Status
SMART commands with Feature Register values not mentioned in the above table are not supported, and will be
aborted.
11.1 S.M.A.R.T. Enable / Disable operations
This command enables / disables access to the SMART capabilities of the CF card.
The state of SMART (enabled or disabled) is preserved across power cycles.
Table 112: S.M.A.R.T. Enable / Disable operations (Feature D8h / D9h)
Task File Register
7
6
5
4
3
2
1
0
COMMAND
B0h
DRIVE/HEAD
1
1
1
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
C2h
4Fh
nu
nu
D8h / D9h
11.2 S.M.A.R.T. Enable / Disable Attribute Autosave
This command is effectively a no-operation as the data for the SMART functionality is always available and kept
current in the CF card.
Table 113: S.M.A.R.T. Enable / Disable Attribute Autosave (Feature D2h)
Task File Register
7
6
5
4
3
2
1
0
COMMAND
B0h
DRIVE/HEAD
1
1
1
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
11.3 S.M.A.R.T. Read data
This command returns one sector of SMART data.
Table 114: S.M.A.R.T. read data (Feature D0h)
C2h
4Fh
nu
00h or F1h
D2h
Task File Register
7
6
5
4
3
2
1
0
COMMAND
B0h
DRIVE/HEAD
1
1
1
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
C2h
4Fh
nu
nu
D0h
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-440_data_sheet_CF-HxBU_Rev100.doc
Page 87 of 102
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