
HB288800/640/448/320/256/192/160/128/096/064/032A5
37
5. Sector number register:
This register contains the starting sector number which is started by following
sector transfer command.
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Sector number byte
6. Cylinder low register:
This register contains the low 8-bit of the starting cylinder address which is
started by following sector transfer command.
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Cylinder low byte
7. Cylinder high register:
This register contains the high 8-bit of the starting cylinder address which is
started by following sector transfer command.
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Cylinder high byte
This register is used for selecting the Drive number and Head number for the
following command.
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
1
LBA
1
DRV
Head number
bit
Name
Function
7
1
This bit is set to "1".
6
LBA
LBA is a flag to select either Cylinder / Head / Sector (CHS) or
Logical Block Address (LBA) mode. When LBA=0, CHS mode is
selected. When LBA=1, LBA mode is selected. In LBA mode, the
Logical Block Address is interrupted as follows:
LBA07-LBA00 : Sector Number Register D7-D0.
LBA15-LBA08 : Cylinder Low Register D7-D0.
LBA23-LBA16 : Cylinder High Register D7-D0.
LBA27-LBA24 : Drive / Head Register bits HS3-HS0.
5
1
This bit is set to "1".
4
DRV (DRiVe select)
This bit is used for selecting the Master (Card 0) and Slave (Card 1)
in Master/Slave organization. The card is set to be Card 0 or 1 by
using DRV# of the Socket and Copy register.
3 to 0 Head number
This bit is used for selecting the Head number for the following
command. Bit 3 is MSB.