VT82C686B ETC-unknow, VT82C686B Datasheet - Page 60

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VT82C686B

Manufacturer Part Number
VT82C686B
Description
Manufacturer
ETC-unknow
Datasheet
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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
31
Configuration Space Enable
0
Disable ...................................................default
1
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
Register Number
Used to select a specific DWORD in the device’s
configuration space
........................................ always reads 0
1-0
Fixed
Port CFF-CFC - Configuration Data .............................. RW
Revision 1.71 June 9, 2000
There are 7 “functions” implemented in the VT82C686B:
Function #
Function
0
PCI to ISA Bridge
1
IDE Controller
2
USB Controller Ports 0-1
3
USB Controller Ports 2-3
4
Power Management, SMBus & Hardware
Monitor
5
AC97 Audio Codec Controller
6
MC97 Modem Codec Controller
The following sections describe the registers and register bits
of these functions.
-54-
Function 0 Registers - PCI to ISA Bridge
VT82C686B

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