IBM DJSA-210 Hard Drive Specifications - Page 82

Drive Address Register, 8 Device/Head Register, number of heads minus one. In LBA mode

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10.7 Drive Address Register Drive Address Register 7 6 5 4 3 2 1 0 HIZ -WTG -H3 -H2 -H1 -H0 -DS1 -DS0 Figure 51. Drive Address Register This register contains the inverted drive select and head select addresses of the currently selected drive. Bit Definitions HIZ -WTG -H3,-H2,-H1,-H0 -DS1 -DS0 High Impedance. This bit is not a device and will always be in a high impedance state. -Write Gate. This bit is 0 when writing to the disk device is in progress. -Head Select. These four bits are the one's complement of the binary coded address of the currently selected head. Bit -H0 is the least significant. -Drive Select 1. The Drive Select bit for device 1 is active low. DS1 = 0 when device 1 (slave) is selected and active. -Drive Select 0. The Drive Select bit for device 0 is active low. DS0 = 0 when device 0 (master) is selected and active. 10.8 Device/Head Register Device/Head Register 7 6 5 4 3 2 1 0 1 L 1 DRV HS3 HS2 HS1 HS0 Figure 52. Device/Head Register This register contains the device and head numbers. Bit Definitions L Binary encoded address mode select. When L = 0 , addressing is by CHS DRV HS3,HS2,HS1,HS0 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 32GH/30GT/20GN hard disk drive specifications 68

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10.7 Drive Address Register
–DS0
–DS1
–H0
–H1
–H2
–H3
–WTG
HIZ
0
1
2
3
4
5
6
7
Drive Address Register
Figure 51. Drive Address Register
This register contains the inverted drive select and head select addresses of the currently selected drive.
Bit Definitions
-Drive Select 0. The Drive Select bit for device 0 is active low. DS0 = 0 when device
0 (master) is selected and active.
-DS0
-Drive Select 1. The Drive Select bit for device 1 is active low. DS1 = 0 when
device 1 (slave) is selected and active.
-DS1
-Head Select. These four bits are the one's complement of the binary coded
address of the currently selected head. Bit -H0 is the least significant.
-H3,-H2,-H1,-H0
-Write Gate. This bit is 0 when writing to the disk device is in progress.
-WTG
High Impedance. This bit is not a device and will always be in a high impedance
state.
HIZ
10.8 Device/Head Register
HS0
HS1
HS2
HS3
DRV
1
L
1
0
1
2
3
4
5
6
7
Device/Head Register
Figure 52. 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 32GH/30GT/20GN hard disk drive specifications
68