SMC032BF datasheet(54/91 Pages) NUMONYX

Part #	SMC032BF

Description	32MByte, 64MByte, 128MByte, 256MByte, 512MByte, 1GByte, 2GByte, and 4GByte 3.3/5V Supply CompactFlash??Card

PDF	91 Pages

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Manufacturer	NUMONYX [Numonyx B.V]

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CF-ATA registers

SMCxxxBF

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9.11

Card (Drive) Address Register

The Card (Drived) Address register is located at address 3F7h [377h], offset Fh.

This read-only register is provided for compatibility with the AT disk drive interface and can

be used for confirming the drive status. It is recommended that this register is not mapped

into the host’s I/O space because of potential conflicts on Bit 7. The bits are defined as

follows:

9.11.1

Bit 7

This bit is don’t care.

9.11.2

Bit 6 (–WTG)

This bit is ‘0’ when a write operation is in progress, otherwise, it is ‘1’.

9.11.3

Bit 5 (–HS3)

This bit is the negation of bit 3 in the Drive/Head register.

9.11.4

Bit 4 (–HS2)

This bit is the negation of bit 2 in the Drive/Head register.

9.11.5

Bit 3 (–HS1)

This bit is the negation of bit 1 in the Drive/Head register.

9.11.6

Bit 2 (–HS0)

This bit is the negation of bit 0 in the Drive/Head register.

9.11.7

Bit 1 (–nDS1)

This bit is ‘0’ when drive 1 is active and selected.

9.11.8

Bit 0 (–nDS0)

This bit is ‘0’ when the drive 0 is active and selected.

Table 47.

Card (Drive) Address Register

–WTG

–HS3

–HS2

–HS1

–HS0

–nDS1

–nDS0

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