Registers; Figure 48. Register Set - IBM DJSA-210 - Travelstar 10 GB Hard Drive Specifications

10.0 Registers

Addresses
CS0– CS1– DA2
N N x
N A 0
N A 1
N A 1
N A 1
A N 0
A N 0
A N 0
A N 0
A N 0
A N 1
A N 1
A N 1
A N 1
A N 1
A N 1
A N 1
A A x
Logic converntions: A = Signal asserted
N = Signal not asserted
x = Does not matter which it is

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.
DA1 DA0
x x Data bus high imped
x x Data bus high imped
0 x Data bus high imped
1 0 Alternate Status
1 1 Device Address
0 0 Data
0 1 Error Register
1 0 Sector Count
1 1 Sector Number
1 1 * LBA bits 0-7
0 0 Cylinder Low
0 0 * LBA bits 8-15
0 1 Cylinder High
0 1 * LBA bits 16-23
1 0 Device/Head.
1 0 * LBA bits 24-27
1 1 Status
x x Invalid address
Travelstar 32GH/30GT/20GN hard disk drive specifications
Functions
READ (DIOR–)
Control block registers
Command block registers
* = Mapping of registers in LBA mode
65
WRITE (DIOW–))
Not used
Not used
Not used
Device Control
Not used
Data
Features
Sector Count
Sector Number
* LBA bits 0-7
Cylinder Low
* LBA bits 8-15
Cylinder High
* LBA bits 16-23
Device/Head
* LBA bits 24-27
Command
Invalid address