Component Overview; Intel® 460Gx Chipset Components - Intel 460GX Software Developer’s Manual

Introduction
1.1.1

Component Overview

Table 1-1
Table 1-1. Intel® 460GX Chipset Components
Component
SAC
SDC
MAC
MDC
GXB
WXB
PXB
IFB
FWH
PID
1-2
lists the 460GX chipset components.
Name
82461GX Interfaces the address and control portion of the Itanium™ processor
system bus and the memory bus. Acts as a host bridge interface to
System Address
peripheral I/O devices through four Expander busses.
Controller
82462GX Interfaces the data portion of the Itanium processor system bus and
the memory bus.
System Data path
Controller
82463GX Provides the SDRAM RAS/CAS/WE/CS generation as well as
redriving the address to the SDRAMs. It is capable of buffering several
Memory Address
commands from the SAC.
Controller
82464GX Multiplexes the data from the SDRAM to the SDC. On reads, it latches
data from the SDRAM, then transfers the data to the SDC. On writes, it
Memory Data path
latches the data from the SDC, then writes the data to the SDRAM.
Controller
82465GX Provides the control and data interface for an AGP 4X graphics port.
This device attaches to the SAC via two Expander busses which utilize
Graphics Expander
a special configuration.
Bridge
82466GX Provides the primary control and data interface for two independent
64-bit, 66 MHz PCI interfaces. This device attaches to the SAC via an
Wide and fast PCI
Expander bus.
Expander Bridge
82467GX Provides the primary control and data interface for two independent
32-bit, 33-MHz PCI interfaces. These two 32-bit interfaces may
PCI Expander Bridge
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.
82468GX The IFB is a multi-function PCI device implementing a PCI-to-LPC
bridge function, a PCI IDE function, a Universal Serial Bus Host/Hub
I/O and Firmware
function, an SMBus Interface function, Power Management function
Bridge
and the Firmware Hub interface.
82802AC The FWH component interfaces to the IFB component and provides
firmware storage and security features. Further FWH information can
Firmware Hub 8Mb
be found at http://developer.intel.com/design/chipsets/datasheets or by
ordering document 290658.
NEC# UPD66566S1- The PID is an interrupt controller that provides interrupt steering
016 functions. The PID contains the logic required to support 8259A mode,
APIC mode, and SAPIC mode interrupt controller operations. The PID
Programmable
interfaces include a PCI bus interface, an APIC bus interface, a serial
Interrupt Device
IRQ interface, and an interrupt input interface.
Function
Intel® 460GX Chipset Software Developer's Manual