IBM DTLA-305040 Hard Drive Specifications - Page 84

Device/Head Register, Error Register, rently selected head.

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-H3,-H2,-H1,-H0 -Head Select. These four bits are the 1's complement of the binary coded address of the currently selected head. -H0 is the least significant. -DS1 -Drive Select 1. Drive select bit for device 1, active low. DS1=0 when device 1 (slave) is selected and active. -DS0 -Drive Select 0. Drive select bit for device 0, active low. DS0=0 when device 0 (master) is selected and active. 9.8 Device/Head Register Device/Head Register 7 6 5 4 3 2 1 0 1 L 1 DRV HS3 HS2 HS1 HS0 Figure 70. 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 mode. When L=1, addressing is by LBA mode. DRV Device. When DRV=0, device 0 (master) is selected. When DRV=1, device 1 (slave) is selected. HS3,HS2,HS1,HS0 Head Select. These four bits indicate binary encoded address of the head. 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. 9.9 Error Register 76 ICRCE UNC Error Register 5 4 3 2 1 0 0 IDNF 0 ABRT TK0NF AMNF Figure 71. Error Register This register contains status from the last command executed by the device or a diagnostic code. Deskstar 40GV & 75GXP hard disk drive specifications 72

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-H3,-H2,-H1,-H0
-
-Head Select. These four bits are the 1's complement of the binary coded address of the
currently selected head. -H0 is the least significant.
-DS1
-Drive Select 1. Drive select bit for device 1, active low. DS1=0 when device 1 (slave) is
selected and active.
-DS0
-Drive Select 0. Drive select bit for device 0, active low. DS0=0 when device 0 (master) is
selected and active.
9.8
Device/Head Register
HS0
HS1
HS2
HS3
DRV
1
L
1
0
1
2
3
4
5
6
7
Device/Head Register
Figure 70. 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 mode. When
L=1, addressing is by LBA mode.
DRV
Device. When DRV=0, device 0 (master) is selected. When DRV=1, device 1 (slave) is
selected.
HS3,HS2,HS1,HS0
Head Select. These four bits indicate binary encoded address of the head. HS0 is the
least significant bit. At command completion these bits are updated to reflect the cur-
rently 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.
9.9
Error Register
AMNF
TK0NF
ABRT
0
IDNF
0
UNC
ICRCE
0
1
2
3
4
5
6
7
Error Register
Figure 71. Error Register
This register contains status from the last command executed by the device or a diagnostic code.
Deskstar 40GV & 75GXP hard disk drive specifications
72