AMD-761 Datasheet, PDF (21/264 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
2 AMD-761™ System Controller
Programmer’s Interface
2.1 Overview
The AMD-760™ chipset supports both x86 and Alpha™
processors that conform to the Socket2000 bus specification.
Both processors share a compatible view of system memory and
peripherals. Legacy x86 (IBM PC-AT) memory mappings are
implemented by x86 processors (AMD Athlon™ processor) as
shown in Figure 1.
AMD Athlon™
Processor Family
x86 µProcessor
PC Memory
View
Mapping Logic
Socket2000
Northbridge
AMD-761™ System Controller
PCI
Southbridge
AMD-766™ Peripheral Bus
Controller
Same view of the system
AMD Athlon
Processor Family
Alpha µProcessor
Conventional
Memory
View
Socket2000
Northbridge
AMD-761 System Controller
PCI
Southbridge
AMD-766 Peripheral Bus Controller
Figure 1. AMD Athlon™ Processor Family Address Mapping
Chapter 2
AMD-761™ System Controller Programmer’s Interface
9