AMD-761 Datasheet, PDF (135/264 Pages) Advanced Micro Devices – AMD-761-TM System Controller Software/BIOS Design Guide

24081D—February 2002
Preliminary Information
AMD-761™ System Controller Software/BIOS Design Guide
AGP/PCI Revision ID and Class Code
Dev1:0x08
31
30
29
28
27
26
25
24
Bit
Class_Code
Reset
0
0
0
0
0
1
1
0
R/W
R
23
22
21
20
19
18
17
16
Bit
Sub-Class_Code
Reset
0
0
0
0
0
1
0
0
R/W
R
15
14
13
12
11
10
9
8
Bit
Prog_I/F
Reset
0
0
0
0
0
0
0
0
R/W
R
7
6
5
4
3
2
1
0
Bit
Rev_ID
Reset
0
0
0
0
0
0
0
0
R/W
R
Register Description
Bit Definitions
Bit Name
31–24 Class_Code
23–16 Sub-Class_Code
15–8 Prog_I/F
7–0 Rev_ID
AGP/PCI Revision ID and Class Code (Dev1:0x08)
Function
Class Code
This field is always 06h, indicating that it is a bridge device.
Sub-Class Code
This field is always 04h for sub-class code and 00h for Prog. I/F, indicating it is a
PCI/PCI bridge.
Program Interface
This field is always 00h, indicating that it is a PCI-to-PCI bridge.
Revision ID
This field contains an 8-bit value identifying the revision number of the device.
Programming Notes
Chapter 2
AMD-761™ System Controller Programmer’s Interface
123