Device Configuration Overlay (B1H); Device Configuration Restore (Subcommand C0H); Figure 76. Device Configuration Overlay (B1H); Figure 77. Device Configuration Overlay Features Register Values - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications
2.5 inch ata/ide hard disk drive
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13.2 Device Configuration Overlay (B1h)
Command Block Output Registers
Register
Data
Feature
Sector Count
Sector
Number
Cylinder Low
Cylinder
High
Device/Head
Command
Error Register
7
6
5
CRC
UNC
0
0
0
0
Figure 76. Device Configuration Overlay (B1h)
Individual Device Configuration Overlay feature set commands are identified by the value placed in the
Features register. The table below shows these Features register values.
Value
C0h
C1h
C2h
C3h
other
Figure 77. Device Configuration Overlay Features register values
13.2.1 DEVICE CONFIGURATION RESTORE (subcommand C0h)
The DEVICE CONFIGURATION RESTORE command disables any setting previously made by a
DEVICE CONFIGURATION SET command and returns the content of the IDENTIFY DEVICE or
IDENTIFY PACKET DEVICE command response to the original settings as indicated by the data returned
from the execution of a DEVICE CONFIGURATION IDENTIFY command.
7
6
5
4
3
2
1
-
-
-
-
-
-
-
1
0
1
0
V
V
V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
D
-
-
-
1
0
1
1
0
0
0
4
3
2
1
IDN
0
ABT
T0N
0
0
V
0
DEVICE CONFIGURATION RESTORE
DEVICE CONFIGURATION FREEZE LOCK
DEVICE CONFIGURATION IDENTIFY
DEVICE CONFIGURATION SET
Reserved
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
Command Block Input Registers
0
Register
-
Data
V
Error
-
Sector Count
Sector
-
Number
-
Cylinder Low
Cylinder
-
High
-
Device/Head
1
Status
Status Register
0
7
6
5
AMN
BSY
RDY
DF
0
V
V
V
Command
114
7
6
5
4
3
2
1
-
-
-
-
-
-
...See Below...
V
V
V
V
V
V
V
-
-
-
-
-
-
-
V
V
V
V
V
V
V
V
V
V
V
V
V
V
-
-
-
-
-
-
-
...See Below...
4
3
2
1
DSC
DRQ
COR
IDX
-
V
-
-
0
-
-
V
-
V
V
-
0
ERR
V
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