SST48CF024 datasheet(35/60 Pages) SST

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Data Sheet

CompactFlash Card

SST48CF008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192 / 256

S71125-03-000

9/01

375

3.1.5.8 Drive/Head (LBA 27-24) Register (Address 1F6H[176H]; Offset 6)

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:

Bit 7

This bit is set to 1.

Bit 6

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.

Bit 5

This bit is set to 1.

Bit 4 (DRV)

DRV is the drive number. When DRV=0, drive (card) 0 is selected. When DRV=1, drive

(card) 1 is selected. The CompactFlash card is set to be Card 0 or 1 using the copy field

(Drive #) of the PCMCIA Socket & Copy configuration register.

Bit 3 (HS3)

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.

Bit 2 (HS2)

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.

Bit 1 (HS1)

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.

Bit 0 (HS0)

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

DRV

HS3

HS2

HS1

HS0

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