SST55LD019A Silicon Storage Technology, Inc., SST55LD019A Datasheet - Page 19

• Manufacturer Part Number: SST55LD019A
• Description: Ata Flash Disk Controllersst's Ata Flash Disk Controller is The Heart of a High Performance, Flash Media-based Data Storage System. The Ata Flash Disk Controller Recognizes The Control, Address, And Data Signals on The Ata/ide Bus And Translates Them
• Manufacturer: Silicon Storage Technology, Inc.

ATA Flash Disk Controller
SST55LD019A / SST55LD019B / SST55LD019C
11.1.2.8 Drive/Head (LBA 27-24) Register
The Drive/Head register is used to select the drive and head. It is also used to select LBA addressing instead of
cylinder/head/sector addressing. The bits are defined as follows:
©2004 Silicon Storage Technology, Inc.
Symbol
LBA
DRV
HS3
HS2
HS1
HS0
D7
1
Function
LBA is a flag to select either Cylinder/Head/Sector (CHS) or Logical Block Address mode (LBA).
When LBA=0, Cylinder/Head/Sector mode is selected. When LBA=1, Logical Block Address is
selected. In Logical Block mode, the Logical Block Address is interpreted as follows:
LBA7-LBA0: Sector Number register D7-D0.
LBA15-LBA8: Cylinder Low register D7-D0.
LBA23-LBA16: Cylinder High register D7-D0.
LBA27-LBA24: Drive/Head register bits HS3-HS0.
DRV is the drive number. When DRV=0 (Master), Master is selected.
When DRV=1 (Slave), Slave is selected.
When operating in the Cylinder, Head, Sector mode, this is bit 3 of the head number.
It is Bit 27 in the Logical Block Address mode.
When operating in the Cylinder, Head, Sector mode, this is bit 2 of the head number.
It is Bit 26 in the Logical Block Address mode.
When operating in the Cylinder, Head, Sector mode, this is bit 1 of the head number.
It is Bit 25 in the Logical Block Address mode.
When operating in the Cylinder, Head, Sector mode, this is bit 0 of the head number.
It is Bit 24 in the Logical Block Address mode.
LBA
D6
D5
1
DRV
D4
19
HS3
D3
HS2
D2
HS1
D1
HS0
Advance Information
D0
S71241-02-000
Reset Value
1010 0000b
4/04