Intel 460GX 1.1.1Component Overview, Table 1-1.Intel® 460GX Chipset Components

Introduction

1.1.1Component Overview

Table 1-1lists the 460GX chipset components.

Table 1-1. Intel® 460GX Chipset Components

Component	Name	Function
SAC	82461GX	Interfaces the address and control portion of the Itanium™ processor
	System Address	system bus and the memory bus. Acts as a host bridge interface to
		peripheral I/O devices through four Expander busses.
	Controller
SDC	82462GX	Interfaces the data portion of the Itanium processor system bus and
	System Data path	the memory bus.
	Controller
MAC	82463GX	Provides the SDRAM RAS/CAS/WE/CS generation as well as
	Memory Address	redriving the address to the SDRAMs. It is capable of buffering several
		commands from the SAC.
	Controller
MDC	82464GX	Multiplexes the data from the SDRAM to the SDC. On reads, it latches
	Memory Data path	data from the SDRAM, then transfers the data to the SDC. On writes, it
		latches the data from the SDC, then writes the data to the SDRAM.
	Controller
GXB	82465GX	Provides the control and data interface for an AGP 4X graphics port.
	Graphics Expander	This device attaches to the SAC via two Expander busses which utilize
		a special configuration.
	Bridge
WXB	82466GX	Provides the primary control and data interface for two independent
	Wide and fast PCI	64-bit, 66 MHz PCI interfaces. This device attaches to the SAC via an
		Expander bus.
	Expander Bridge
PXB	82467GX	Provides the primary control and data interface for two independent
	PCI Expander Bridge	32-bit, 33-MHz PCI interfaces. These two 32-bit interfaces may
		operate together to produce a single 64-bit, 33-MHz interface via a
		configuration option. This device attaches to the SAC via an Expander
		bus.
IFB	82468GX	The IFB is a multi-function PCI device implementing a PCI-to-LPC
	I/O and Firmware	bridge function, a PCI IDE function, a Universal Serial Bus Host/Hub
		function, an SMBus Interface function, Power Management function
	Bridge
		and the Firmware Hub interface.
FWH	82802AC	The FWH component interfaces to the IFB component and provides
	Firmware Hub 8Mb	firmware storage and security features. Further FWH information can
		be found at http://developer.intel.com/design/chipsets/datasheets or by
		ordering document 290658.
PID	NEC# UPD66566S1-	The PID is an interrupt controller that provides interrupt steering
	016	functions. The PID contains the logic required to support 8259A mode,
	Programmable	APIC mode, and SAPIC mode interrupt controller operations. The PID
		interfaces include a PCI bus interface, an APIC bus interface, a serial
	Interrupt Device
		IRQ interface, and an interrupt input interface.

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