AMD-761 datasheet(53/264 Pages) AMD

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Chapter 2

AMD-761™ System Controller Programmer’s Interface

24081D—February 2002

AMD-761™ System Controller Software/BIOS Design Guide

Preliminary Information

AGP/PCI Capabilities Pointer

Dev0:F0:0x34

Programming Notes

Bit

Reserved

Reset

00000000

R/W

Bit

Reserved

Reset

00000000

R/W

Bit

Reserved

Reset

00000000

R/W

Bit

CAP_PTR

Reset

10100000

R/W

Bit Definitions

AGP/PCI Capabilities Pointer (Dev0:0x34)

Bit

Name

Function

31–8

Reserved

7–0

CAP_PTR

Capabilities Pointer

This field contains a byte offset into a device’s configuration space containing the first item

in the capabilities list. The first item in the capabilities list is the AGP function.

Note that when the AGP valid bit in the PCI-to-PCI bridge virtual address space register is

set to invalid, this capabilities pointer is set by the chipset to point to the next item in the

linked list. If no next item exists, then it is set to null.

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