AMD-761 Datasheet, PDF (36/264 Pages) Advanced Micro Devices – AMD-761-TM System Controller Software/BIOS Design Guide

Preliminary Information
AMD-761™ System Controller Software/BIOS Design Guide
24081D—February 2002
Bit Definitions
Bit Name
31 Config_En
30–24 Reserved
23—16 PCI_Bus_Num
15—11 Dev_Num
10—8 Func_Num
7—2 Reg_Num
1—0 Reserved
Programming Notes
Configuration Address Register Type 1 (I/O:0CF8)
Function
Configuration Enable
0 = PCI configuration cycles are not generated.
1 = Accesses to the Configuration Data and Address registers are converted to
configuration cycles on the PCI.
Reserved
PCI Bus Number
This bit field defines which PCI bus in the system is referenced with this address. The
AMD-761™ system controller logically implements two PCI buses. The main PCI bus
normally enumerates as bus 0 and the AGP bus enumerates as bus 1.
Device Number
This bit field defines which device is accessed in the system on the target PCI bus. This field
is passed on directly to the AD wires undecoded.
Function Number
This bit field defines which function is accessed in a given device. This field is passed on
directly to the AD wires undecoded.
Register Number
This bit field defines which specific PCI register is accessed in the device and function
specified above.
Reserved
24
AMD-761™ System Controller Programmer’s Interface
Chapter 2