VT8231 datasheet(62/132 Pages) ETC

62 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-56-

Function 0 Registers - PCI to ISA Bridge

7HFKQRORJLHV ,QF

:H &RQQHFW

PCI Configuration Space I/O

PCI configuration space accesses for functions 0-6 use PCI

configuration mechanism 1 (see PCI specification revision 2.2

for more details).

The ports respond only to double-word

accesses. Byte or word accesses will be passed on unchanged.

Port CFB-CF8 - Configuration Address .........................RW

Configuration Space Enable

Disabled .................................................default

Convert configuration data port writes to

configuration cycles on the PCI bus

30-24 Reserved

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

23-16 PCI Bus Number

Used to choose a specific PCI bus in the system

15-11 Device Number

Used to choose a specific device in the system

10-8 Function Number

Used to choose a specific function if the selected

device supports multiple functions

7-2

Used to select a specific DWORD in the device’s

configuration space

1-0

Fixed

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

Port CFF-CFC - Configuration Data ..............................RW

There are 7 “functions” implemented in the VT8231:

Function #

Function

PCI to ISA Bridge

IDE Controller

USB Controller Ports 0-1

USB Controller Ports 2-3

Power Management, SMBus & Hardware

Monitor

AC97 Audio Codec Controller

MC97 Modem Codec Controller

The following sections describe the registers and register bits

of these functions.

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