IBM Deskstar 120 GXP, Specifications

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8.0 Registers
Invalid address x x x A A
Command Status 1 1 1 N A
LBA bits 24–27
1
LBA bits 24–27
1
0 1 1 N A
Device/Head Device/Head. 0 1 1 N A
LBA bits 16–23
1
LBA bits 16–23
1
1 0 1 N A
Cylinder High Cylinder High 1 0 1 N A
LBA bits 8–15
1
LBA bits 8–15
1
0 0 1 N A
Cylinder Low Cylinder Low 0 0 1 N A
LBA bits 0–7
1
LBA bits 0–7
1
1 1 0 N A
Sector Number Sector Number 1 1 0 N A
Sector Count Sector Count 0 1 0 N A
Features Error Register 1 0 0 N A
Data Data 0 0 0 N A
Command block registers
Not used Device Address 1 1 1 A N
Device Control Alternate Status 0 1 1 A N
Not used Data bus high impedance x 0 1 A N
Not used Data bus high impedance x x 0 A N
Control block registers
Not used Data bus high impedance x x x N N
WRITE (DIOW–) READ (DIOR–) DA0 DA1 DA2 CS1– CS0–
Functions Addresses
1
Mapping of registers in LBA mode
X = may be A or N
N = signal negated
A = signal asserted Logic conventions:
Figure 68. Register Set
Communication to or from the device is through an I/ O Register that routes the input or output data to or
from registers addressed by the signals from the host (CS0
– , CS1 – , DA2, DA1, DA0, DIOR – and DIOW – ).
The Command Block Registers are used for sending commands to the device or posting status from the
device.
The Control Block Registers are used for device control and for posting alternate status.
Deskstar 120GXP hard disk drive specifications
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