VT8235 datasheet(73/145 Pages) VIA

73 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-67-

Device 17 Function 0 Bus Control Registers

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GPIO and Miscellaneous Control

Offset 58 – Miscellaneous Control 0 (40h).......................RW

Reserved

........................................ always reads 0

Internal APIC

Disable

Enable....................................................default

South Bridge Interrupt Cycles Run at 33 MHz

Disable .................................................. default

Enable

Address Decode

Subtractive............................................. default

Positive

RTC High Bank Access

Disable access to upper 128 bytes ......... default

Enable access to upper 128 bytes

RTC Rx32 Write Protect

Disable (not protected) .......................... default

Enable (write protected)

RTC Rx0D Write Protect

Disable (not protected) .......................... default

Enable (write protected)

RTC Rx32 Map to Century Byte

Controls whether RTC Rx32 is mapped to the

century byte.

Disable .................................................. default

Enable

Offset 59 – Miscellaneous Control 1 (00h) ...................... RW

7-6

Reserved

........................................always reads 0

LPC RTC

Disable ................................................... default

Enable

LPC Keyboard

Disable (ISA Keyboard) ........................ default

Enable (LPC Keyboard)

External MCCS to LPC

Controls whether external MCCS is through LPC or

ISA when internal MCCS is not used.

Disable (ISA MCCS) ............................. default

Enable (LPC MCCS)

Internal MCCS (Microcontroller Chip Select)

Disable (external MCCS) ...................... default

Enable (internal MCCS)

A20M# Active

Disable (A20M# signal not asserted)..... default

Enable (A20M# signal asserted)

NMI on PCI Parity Error

Disable ................................................... default

Enable (to generate NMI, Port 61[3] and Port

70[7] must also be set)

VT8235 Datasheet(PDF) 73 Page - VIA Technologies, Inc.

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