910GL datasheet(64/426 Pages) INTEL

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Bit

Access

Default

Description

15:11

R/W

00h

Device Number: This field selects one agent on the PCI bus selected by the Bus

Number. When the Bus Number field is “00”, the (G)MCH decodes the Device

Number field. The (G)MCH is always Device Number 0 for the Host bridge entity,

Device Number 1 for the Host-PCI Express entity. Therefore, when the

Bus Number =0 and the Device Number equals 0, 1, or 2 the internal (G)MCH

devices are selected.

This field is mapped to byte 6 [7:3] of the request header format during PCI

Express Configuration cycles and A [15:11] during the DMI configuration cycles.

10:8

R/W

000b

Function Number: This field allows the configuration registers of a particular

function in a multi-function device to be accessed. The (G)MCH ignores

configuration cycles to its internal devices if the function number is not equal to 0

or 1.

This field is mapped to byte 6 [2:0] of the request header format during PCI

Express Configuration cycles and A[10:8] during the DMI configuration cycles.

7:2

R/W

00h

and Function as specified by the other fields in the Configuration Address

This field is mapped to byte 7 [7:2] of the request header format during PCI

Express Configuration cycles and A[7:2] during the DMI Configuration cycles.

1:0

Reserved

3.4.2

CONFIG_DATA—Configuration Data Register

I/O Address:

0CFCh

Default Value:

00000000h

Access:

R/W

Size:

32 bits

CONFIG_DATA is a 32-bit read/write window into configuration space. The portion of

configuration space that is referenced by CONFIG_DATA is determined by the contents of

CONFIG_ADDRESS.

Bit

Access &

Default

Description

31:0

R/W

0000 0000h

Configuration Data Window (CDW): If bit 31 of CONFIG_ADDRESS is 1, any

I/O access to the CONFIG_DATA register will produce a configuration

transaction using the contents of CONFIG_ADDRESS to determine the bus,

device, function, and offset of the register to be accessed.

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