User's Manual

Introduction
1-2 Intel
®
820 Chipset Design Guide
1.2 References
•
Intel
®
820 Chipset: Intel
®
82820 Memory Controller Hub (MCH) Datasheet
(Order Number: 290630)
•
Intel
®
82801AA (ICH) and Intel
®
82801AB (ICH0) I/O Controller Hub Datasheet
(Order Number: 290655)
•
Intel
®
82802AB/82802AC FirmWare Hub (FWH) Datasheet (Order Number: 290658)
•
Pentium
®
II Processor AGTL+ Guidelines (Order Number: 243330)
•
Pentium
®
II Processor Power Distribution Guideline (Order Number: 243332)
•
Pentium
®
II Processor Developer's Manual (Order Number: 243341)
•
Pentium
®
III Processor Specification Update (latest off of website)
•
AP 907 Pentium III processor Power Distribution Guidelines (Order Number 245085)
•
AP-585 Pentium II Processor AGTL+ Guidelines (Order Number: 243330)
•
AP-587 Pentium II Processor Power Distribution Guidelines (Order Number: 243332)
•
CK97 Clock Synthesizer Design Guidelines (Order Number 243867)
•
PCI Local Bus Specification, Revision 2.2
•
Universal Serial Bus Specification, Revision 1.0
•
VRM 8.4 DC-DC Converter Design Guidelines (when available)
1.3 System Overview
The Intel
®
820 chipset is the third generation desktop chipset designed for Intel’s SC242
architecture and the first chipset to support the 4X capability of the AGP 2.0 Interface Specification
and 400 MHz Direct RDRAM. The 400 MHz, 16 bit, double clocked Direct RDRAM interface
provides 1.6 GB/s access to main memory. A new chipset component interconnect, the hub
interface, is designed into the Intel
®
820 chipset to provide more efficient communication between
chipset components.
Support of AGP 4X, 400 MHz Direct RDRAM and the hub interface provides a balanced system
architecture for the Pentium III processor, minimizing bottlenecks and increasing system
performance. By increasing memory bandwidth to 1.6 GB/s through the use of 400 MHz Direct
RDRAM and increasing graphics bandwidth to 1 GB/s through the use of AGP 4X, the Intel
®
820
chipset delivers the data throughput necessary to take advantage of the high performance provided
by the powerful Pentium III processor.
In addition, the Intel
®
820 chipset architecture enables a new security and manageability
infrastructure through the Firmware Hub component.
The ACPI compliant Intel
®
820 chipset platform can support the Full-on, Stop Grant, Suspend to
RAM, Suspend to Disk, and Soft-off power management states. Through the use of an appropriate
LAN device, Intel
®
820 chipset also supports Wake on LAN
*
for remote administration and
troubleshooting.
The Intel
®
820 chipset architecture removes the requirement for the ISA expansion bus that was
traditionally integrated into the I/O subsystem of Intel chipsets. This removes many of the conflicts
experienced when installing hardware and drivers into legacy ISA systems. The elimination of ISA
provides true plug-and-play for the Intel
®
820 chipset platform. Traditionally, the ISA interface
was used for audio and modem devices. The addition of AC’97 allows the OEM to use software