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Intel® 460GX Chipset Software Developer’s Manual 1-1
Introduction 1
This document provides information about the Intel® 460GX chipset components. The 460GX
chipset is a high performance memory and I/O chipset for the Intel Itanium™ processor, targeted
for multiprocessor server and high-end workstation designs.
This document describes the software programmer's interface to the 460GX chipset. It provides a
brief summary of the system architecture supported by the 460GX chipset, a list of features within
the chipset and a detailed description of software or other externally visible segments.
1.1 System Overview
The Intel 460GX chipset is a high performance chipset for Intel Itanium processor-based systems,
targeted for multiprocessor servers and high-performance workstations. It provides the memory
controller interface and appropriate bridges to PCI, AGP 4X, and other standard I/O buses.
Figure 1-1 illustrates the basic system configuration of a four-processor platform.
Figure 1-1. Diagram of a Typical Intel® 460GX Chipset-based System with AGP
000346e
USB
GXB
Graphi cs
Exp ans io n
Br i dge
Expander
Buses
PXB
PCI
Expansion
Bridge
AGP
4X Mode
Sl ot
GAR T
SRAM
Compatibility
PCI Bus
PI D
Pr ogr ammabl e
Interrupt Device
IFB
I/O and Firmware
Bri dge
SDC
System Dat a
Controller
IDE HDD
IDE CD-ROM
Private Bus
Memory Data and Control Bus
Itanium™ Processor System Bus
Pr oce sso r
Cache
Processor
Cac he
Processor
Cac he
Processor
Cac h e
WXB
Wide PCI
Expansion
Bri dge
2 PCI Buses
3.3V/5.0V,
32-bit, 33 MHz
2 PCI Buses
3.3V, 64-bit, 66 MHz
MAC
MAC
MDC
MDC
MDC
MDC
Memory Subsystem
MAC
MAC
MDC
MDC
MDC
MDC
Memory Subsystem
SAC
System Address
Con t r oll er
Super
I/O
FWH
Firmware
Hub
Firmware
Hub Interface
LPC Interface