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Intel® 460GX Chipset Software Developer’s Manual 1-3
Introduction
1.2 Product Features
1.3 Itanium™ 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.
• 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.