IBM DJSA-205, Specifications, Page: 79 / 211

10.0 Registers
Invalid address Invalid address x x x A A
Command Status 1 1 1 N A
* LBA bits 24-27 * LBA bits 24-27 0 1 1 N A
Device/Head Device/Head. 0 1 1 N A
* LBA bits 16-23 * LBA bits 16-23 1 0 1 N A
Cylinder High Cylinder High 1 0 1 N A
* LBA bits 8-15 * LBA bits 8-15 0 0 1 N A
Cylinder Low Cylinder Low 0 0 1 N A
* LBA bits 0-7 * LBA bits 0-7 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 imped x 0 1 A N
Not used Data bus high imped x x 0 A N
Control block registers
Not used Data bus high imped x x x N N
WRITE (DIOW–)) READ (DIOR–) DA0 DA1 DA2 CS1– CS0–
Functions Addresses
x = Does not matter which it is
N = Signal not asserted
* = Mapping of registers in LBA mode A = Signal asserted Logic converntions:
Figure 48. Register Set
Communication to or from the device is through an I/O Register that routes the input or output data to or
from the 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 to post alternate status.
Travelstar 32GH/30GT/20GN hard disk drive specifications
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