VIA Technologies, Inc.

Preliminary VT83C469

21

ATA Mode Control Register ( Read/Write )

Address : Index ( Base + 26h )

D7

A25/CSEL.

In ATA mode, this bit is applied to the ATA A25/CSEL and is vendor specific. Certain ATA drive

vendor specific performance enhancements beyond the PCMCIA 2.0 standard may be controlled

through use of this bit. This bit has no hardware control function when not in ATA mode.

D6

A24/M/S#.

In ATA mode, this bit is applied to the ATA A24/M/S# and is vendor specific. Certain ATA drive

vendor specific performance enhancements beyond the PCMCIA 2.0 standard may be controlled

through use of this bit. This bit has no hardware control function when not in ATA mode.

D5

A23/VU.

In ATA mode, this bit is applied to the ATA A23/VU and is vendor specific. Certain ATA drive

vendor specific performance enhancements beyond the PCMCIA 2.0 standard may be controlled

through use of this bit. This bit has no hardware control function when not in ATA mode.

D4

A22.

In ATA mode, this bit is applied to the ATA A22 and is vendor specific. Certain ATA drive vendor

specific performance enhancements beyond the PCMCIA 2.0 standard may be controlled through

use of this bit. This bit has no hardware control function when not in ATA mode.

9D3

A21.

In ATA mode, this bit is applied to the ATA A21 and is vendor specific. Certain ATA drive vendor

specific performance enhancements beyond the PCMCIA 2.0 standard may be controlled through

use of this bit. This bit has no hardware control function when not in ATA mode.

D2

R/W. 0

D1

Speaker is LED Input.

0: Normal operation.

1: The PC Card SPKR# pin will be used to drive IRQ12 if Drive LED Enable is set.

D0

ATA Mode.

0: Normal operation.

1: Configures the socket interface to handle ATA type III disk drives.

VIA ID Register (Read)

Address: Index (Base + 2Eh)

D [7:4]

Major Version

R. 1000

D [3:0]

Minor Version

R. 0001