VT8231 datasheet(35/132 Pages) ETC

35 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-29-

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REGISTERS

The following tables summarize the configuration and I/O

registers of the VT8231.

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 2. 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-

* On-Chip Super-I/O Functions – PC-Standard Port Addresses

200-20F

Game Port

2E8-2EF

COM4

2F8-2FF

COM2

378-37F

Parallel Port (Standard & EPP)

3E8-3EF

COM3

3F0-3F1

Configuration Index / Data

3F0-3F7

Floppy Controller

3F8-3FF

COM1

400-402

Parallel Port (ECP Extensions)

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