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VT8237R Data Sheet

Revision 2.06 December 15, 2004 -52- PCI Configuration Space I/O Registers

Configuration Space I/O

Configuration space accesses for all functions 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 Disabled .................................................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 doubleword in the device’s

configuration space

1-0 Fixed ........................................ always reads 0

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

There are 8 “functions” implemented in the VT8237R (see

Table 5 on page 24). The following sections describe the

registers and register bits of these functions.

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 180 181

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VIA Technologies KT880 Specifiche Pagina 60