VT83C469 datasheet(16/36 Pages) ETC

16 / 36 page

VIA Technologies, Inc.

Preliminary VT83C469

I/O Control Register ( Read/Write )

Address : Index ( Base + 07h )

BIT

FUNCTION

I/O Window 1 Wait State.

0: 16-bit system accesses occur with no additional wait state.

1: 16-bit system accesses occur with one additional wait state( 4 BUSCLKs ).

I/O Window 1 zero wait state.

0: 8-bit system I/O access will occur with additional wait state.

1: 8-bit system I/O access will occur with no additional wait state and the NOWS# will be

returned to the system bus.

I/O Window 1 IOCS16# Source.

0: IOCS16# is generated based on the value of the data size bit.

1: IOCS16# is generated based on the IOIS16# signal from PC Card.

I/O Window 1 Data Size.

0: 8-bit I/O data path to PC Card.

1: 16-bit I/O data path to PC Card.

I/O Window 0 Wait State.

0: 16-bit system accesses occur with no additional wait state.

1: 16-bit system accesses occur with one additional wait state( 4 BUSCLKs ).

I/O Window 0 zero wait state.

0: 8-bit system I/O access will occur with additional wait state.

1: 8-bit system I/O access will occur with no additional wait state and the NOWS# will be

returned to the system bus.

I/O Window 0 IOCS16# Source.

0: IOCS16# is generated based on the value of the data size bit.

1: IOCS16# is generated based on the IOIS16# signal from PC Card.

I/O Window 0 Data Size.

0: 8-bit I/O data path to PC Card.

1: 16-bit I/O data path to PC Card.

I/O Address Start Register Low Byte ( Read/Write )

Address : Window 0 Index ( Base + 08h )

Address : Window 1 Index ( Base + 0Ch )

BIT

FUNCTION

D[7:0]

I/O Window Start Address A[7:0]

Low order address bits used to determine the start address of the corresponding I/O address

window. This provides a minimum 1 byte window for I/O address window.

I/O Address Start Register High Byte ( Read/Write )

Address : Window 0 Index ( Base + 09h )

Address : Window 1 Index ( Base + 0Dh )

BIT

FUNCTION

D[7:0]

I/O Window Start Address A[15:8]

High order address bits used to determine the start address of the corresponding I/O address

window.

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