SMCXXXBF datasheet(51/91 Pages) STMICROELECTRONICS

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SMCxxxBF

CF-ATA registers

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9.8

Drive/Head (LBA 27-24) Register

The Driver/Head register is located at address 1F6h [176h], offset 6h.

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 in Table 44

9.8.1

Bit 7

This bit is set to ‘1’.

9.8.2

Bit 6 (LBA)

LBA is a flag to select either Cylinder/Head/Sector (CHS) or Logical Block Address Mode

(LBA). When LBA is set to ‘0’, Cylinder/Head/Sector mode is selected. When LBA is set

to’1’, Logical Block Address is selected. In Logical Block Mode, the Logical Block Address is

interpreted as follows:

●

LBA7-LBA0: Sector Number Register D7 to D0

●

LBA15-LBA8: Cylinder Low Register D7 to D0

●

LBA23-LBA16: Cylinder High Register D7 to D0

●

LBA27-LBA24: Drive/Head Register bits HS3 to HS0

9.8.3

Bit 5

This bit is set to ‘1’.

9.8.4

Bit 4 (DRV)

DRV is the drive number. When DRV is ‘0’, drive/card 0 is selected (Master). When DRV is

‘1’, drive/card 1 is selected (Slave). The Card is set to Card 0 or 1 using the copy field (Drive

#) of the PCMCIA Socket & Copy configuration register.

9.8.5

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.

9.8.6

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.

9.8.7

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.

9.8.8

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.

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