Introduction

1.2Product Features

•High performance hardware based on IA-64 architecture

—4.2 GB/s memory bandwidth can simultaneously support both the full system bus and the full I/O bus bandwidths

—Architectural support for 64 MB to 64 GB of

SDRAM

—Support for up to four bridge chips that interface to the 82461GX (SAC) through four Expander channels, each 30 bits wide and providing 533 MB/s peak bandwidth

—AGP 4X compatible, via the 82465GX (GXB) and two Expander channels running at 266 MHz totaling 1 GB/s peak bandwidth

—Support for two 64-bit, 66-MHz PCI buses using one 82466GX (WXB) component per Expander channel

—Support for two independent 32-bit, 33-MHz PCI buses or one 64-bit, 33-MHz PCI bus via the 82467GX (PXB) per Expander channel

—Data streaming support between Expanders and DRAM, up to 533 MB/s per Expander channel

•Extensive RAS features for mission-critical needs

—ECC protection on the system bus data signals

—Memory ECC with single-bit error correction, double and nibble error detection

—Address and data flows protected by parity throughout chipset

—ECC bits in DRAM accessible by diagnostics

—Fault recording of multiple errors; sticky through reset

—JTAG TAP port for debug and boundary scan capability

—I2C slave interface for viewing and modifying specific error and configuration registers

—Bus, memory and I/O performance counters

—Support of ACPI/DMI functions (support is provided in the IFB)

•High bandwidth system bus for multiprocessor scalability

— Support of the Intel® Itanium™ processor 64-bit data bus

—Full support for 4-way multiprocessing

—266 MHz data bus frequency

—Cache line size of 64 bytes

—Enhanced defer feature for out-of-order data delivery using IDS#

—AGTL+ bus driver technology

•Features to support flexible platform environments

—Hardware compatible with IA-32 binaries

—AGP address space up to 32 GB supported

—Support for Auto Detection of SDRAM memory type and mixed memory sizes allowed between rows

—Supports 16-, 64-, 128- and 256-Mbit DRAM devices

—Full support for the PCI Configuration Space Enable (CSE) protocol to devices on all Expander channels

—WXB supports 3.3 volt PCI bus operation (supports universal and 3.3 volt PCI cards) and has an Integrated Hot-Plug Controller**

—PCI Rev. 2.2 compliant on the WXB and

PXB

—GXB supports fast writes and 1x, 2x and 4x data rates

—1 MB or greater of firmware storage provided by the 82802AC (FWH)

—Interrupt controller, bus-mastering IDE and Universal Serial Bus supported by the 82468GX (IFB)

—Support of 8259A mode, APIC mode and SAPIC mode interrupts via the UPD55566S1-016 (PID) provided by NEC*

**Based on technology licensed from Compaq Computer Corp.

1.3Itanium™ Processor System Bus Support

•Full support for the Itanium processor system bus.

—64-bit data bus.

—266 MHz data bus frequency.

—Cache line size of 64 bytes.

—Supports SAPIC interrupt protocol.

•Full support for 4-way multiprocessing.

•Parity protection on address and control signals, ECC protection on the data signals.

•GTL+ bus driver technology.

Intel® 460GX Chipset Software Developer’s Manual

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