VT8235 datasheet(27/145 Pages) VIA

27 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

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REGISTERS

The following tables summarize the configuration and I/O

registers of the VT8235.

These tables also document the

power-on default value (“Default”) and access type (“Acc”)

for each register.

Access type definitions used are RW

(Read/Write), RO (Read/Only), “—” for reserved / used

(essentially the same as RO), and RWC (or just WC) (Read /

Write 1’s to Clear individual bits). Registers indicated as RW

may have some read/only bits that always read back a fixed

value (usually 0 if unused); registers designated as RWC or

WC may have some read-only or read write bits (see

individual register descriptions for details).

Detailed register descriptions are provided in the following

section of this document. All offset and default values are

shown in hexadecimal unless otherwise indicated

Table 4. Memory Mapped Registers

FEC00000 APIC Index

(8-bit)

FEC00010 APIC Data

(32-bit)

FEC00020 APIC IRQ Pin Assertion

(8-bit)

FEC00040 APIC EOI

(8-bit)

“APIC” = “Advanced Programmable Interrupt Controller”

Table 5. Function Summary

Bus Device Func Device ID Function

0 16 (10h)

3038h

USB 1.1 UHCI Ports 0-1

0 16 (10h)

3038h

USB 1.1 UHCI Ports 2-3

0 16 (10h)

3038h

USB 1.1 UHCI Ports 4-5

0 16 (10h)

3038h

USB 2.0 EHCI Ports 0-5

0 17 (11h)

3074h

Bus Control & Power Mgmt

0 17 (11h)

0571h

IDE Controller

0 17 (11h)

3059h

AC97 Audio Codec Controller

0 17 (11h)

3068h

MC97 Modem Codec Ctrlr

0 18 (12h)

3043h

VIA LAN Controller

Table 6. System I/O Map

Port

Function

Actual Port Decoding

00-1F

Master DMA Controller

0000 0000 000x nnnn

20-3F

Master Interrupt Controller 0000 0000 001x xxxn

40-5F

Timer / Counter

0000 0000 010x xxnn

60-6F

Keyboard Controller

0000 0000 0110 xnxn

(60h)

KBC Data

0000 0000 0110 x0x0

(61h)

Misc Functions & Spkr Ctrl 0000 0000 0110 xxx1

(64h)

KBC Command / Status

0000 0000 0110 x1x0

70-77

RTC/CMOS/NMI-Disable 0000 0000 0111 0nnn

78-7F

-available for system use-

0000 0000 0111 1xxx

-reserved- (debug port)

0000 0000 1000 0000

81-8F

DMA Page Registers

0000 0000 1000 nnnn

90-91

-available for system use-

0000 0000 1001 000x

System Control

0000 0000 1001 0010

93-9F

-available for system use-

0000 0000 1001 nnnn

A0-BF

Slave Interrupt Controller

0000 0000 101x xxxn

C0-DF

Slave DMA Controller

0000 0000 110n nnnx

E0-FF

-available for system use-

0000 0000 111x xxxx

100-CF7

-available for system use*

CF8-CFB

PCI Configuration Address 0000 1100 1111 10xx

CFC-CFF

PCI Configuration Data

0000 1100 1111 11xx

D00-FFFF -available for system use-

VT8235 Datasheet(PDF) 27 Page - VIA Technologies, Inc.

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