ATA20 White Electronic Designs Corporation, ATA20 Datasheet - Page 34

• Manufacturer Part Number: ATA20
• Description: Density = 8MB-160MB ;; Memory Device = Hitachi Flash ;; Organization = X16/x8 ;; Speed (ns) = 250 ;; Volt = 3/5
• Manufacturer: White Electronic Designs Corporation

June 2000 Rev. 5 – ECO #12935
5. Sector number register: This register contains the starting sector number which is started by following
a sector transfer command.
bit7
6. Cylinder low register: This register contains the low 8 bits of the starting cylinder address which is
started by following sector transfer command.
bit7
7. Cylinder high register: This register contains the high 8 bits of the starting cylinder address which is
started by following sector transfer command.
bit7
8. Drive head register: This register is used for selecting the Drive of Master/Slave organization and
Head number for the following command.
bit7
1
bit
7
6
5
4
3 to 0 Head number
7PxxxATA20xxC25
Name
1
LBA
1
DRV (DRiVe select)
bit6
bit6
bit6
bit6
LBA
bit5
bit5
bit5
bit5
1
bit4
bit4
bit4
bit4
DRV
Function
This bit is set to "1".
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:
This bit is set to "1".
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 the DRV# of the Socket and Copy register.
This bit is used for selecting the Head number for the following
command. Bit 3 is MSB.
LBA is a flag to select either Cylinder / Head / Sector (CHS) or
Sector number byte
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.
Cylinder high byte
Cylinder low byte
34
bit3
bit3
bit3
bit3
Head number
White Electronic Designs Corporation [phone]
bit2
bit2
bit2
bit2
bit1
bit1
bit1
bit1
bit0
bit0
bit0
bit0