IBM IC25N020ATDA04 Hard Drive Specifications - Page 85

Registers

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10.0 Registers CS0- N N N N A A A A A A A A A A A A A Addresses CS1- DA2 DA1 N x x A 0 x A 1 0 A 1 1 N 0 0 N 0 0 N 0 1 N 0 1 N 0 1 N 1 0 N 1 0 N 1 0 N 1 0 N 1 1 N 1 1 N 1 1 A x x Functions DA0 READ (DIOR-) WRITE (DIOW-)) Data bus high imped x (*1) Not used Control block registers x Data bus high imped x Data bus high imped 0 Alternate Status Not used Not used Device Control Command block registers 0 Data Data 1 Error Register Features 0 Sector Count Sector Count 1 Sector Number Sector Number 1 LBA bits 0-7 (*2) LBA bits 0-7 (*2) 0 Cylinder Low Cylinder Low 0 LBA bits 8-15 (*2) LBA bits 8-15 (*2) 1 Cylinder High Cylinder High 1 LBA bits 16-23 (*2) LBA bits 16-23 (*2) 0 Device/Head. Device/Head 0 LBA bits 24-27 (*2) LBA bits 24-27 (*2) 1 Status Command x Invalid address Invalid address Logic conventions: A = signal asserted N = signal not asserted x = can be either *1 imped = impedance *2 = Mapping of registers in LBA mode Figure 53. 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 48GH, 30GN & 15GN hard disk drive specifications 71

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10.0 Registers
Invalid address
Invalid address
x
x
x
A
A
Command
Status
1
1
1
N
A
LBA bits 24-27 (*2)
LBA bits 24-27 (*2)
0
1
1
N
A
Device/Head
Device/Head.
0
1
1
N
A
LBA bits 16-23 (*2)
LBA bits 16-23 (*2)
1
0
1
N
A
Cylinder High
Cylinder High
1
0
1
N
A
LBA bits 8-15 (*2)
LBA bits 8-15 (*2)
0
0
1
N
A
Cylinder Low
Cylinder Low
0
0
1
N
A
LBA bits 0-7 (*2)
LBA bits 0-7 (*2)
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
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
(*1)
x
x
x
N
N
WRITE (DIOW-))
READ (DIOR-)
DA0
DA1
DA2
CS1-
CS0-
Functions
Addresses
x = can be either
*2 = Mapping of registers in LBA mode
N = signal not asserted
*1 imped = impedance
A = signal asserted
Logic conventions:
Figure 53. 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 48GH, 30GN & 15GN hard disk drive specifications
71