IBM IC25N020ATDA04 Hard Drive Specifications - Page 88

Device/Head Register, Device. When DRV = 0, device 0 master is selected. When DRV = 1, device 1

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10.7 Device/Head Register Device/Head Register 7 6 5 4 3 2 1 0 1 L 1 DRV HS3 HS2 HS1 HS0 Figure 56. Device/Head Register This register contains the device and head numbers. Bit Definitions L DRV HS3,HS2,HS1,HS0 Binary encoded address mode select. When L = 0 , addressing is by CHS mode. When L = 1, addressing is by LBA mode. Device. When DRV = 0, device 0 (master) is selected. When DRV = 1, device 1 (Slave) is selected. Head Select. These four bits indicate the binary encoded address of the head. Bit HS0 is the least significant bit. At command completion, these bits are updated to reflect the currently selected head. The head number may be from zero to the number of heads minus one. In LBA mode, HS3 through HS0 contain bits 24-27 of the LBA. At command completion, these bits are updated to reflect the current LBA bits 24-27. Travelstar 48GH, 30GN & 15GN hard disk drive specifications 74

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10.7 Device/Head Register
HS0
HS1
HS2
HS3
DRV
1
L
1
0
1
2
3
4
5
6
7
Device/Head Register
Figure 56. Device/Head Register
This register contains the device and head numbers.
Bit Definitions
Head Select. These four bits indicate the binary encoded address of the head. Bit
HS0 is the least significant bit. At command completion, these bits are updated to
reflect the currently selected head. The head number may be from zero to the
number of heads minus one. In LBA mode, HS3 through HS0 contain bits 24–27
of the LBA. At command completion, these bits are updated to reflect the current
LBA bits 24–27.
HS3,HS2,HS1,HS0
Device. When DRV = 0, device 0 (master) is selected. When DRV = 1, device 1
(Slave) is selected.
DRV
Binary encoded address mode select. When L
= 0 , addressing is by CHS mode.
When L = 1, addressing is by LBA mode.
L
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
74