82845GL datasheet(14/193 Pages) INTEL

14 / 193 page

Introduction

Intel® 82845G/82845GL/82845GV GMCH Datasheet

1.2

Related Documents

NOTE: For additional related documents, refer to the Intel® Pentium® 4 Processor in 478-Pin Package and

Intel® 845G/845GL/845GV Chipset Platform Design Guide.

Graphics Core

The internal graphics related logic in the GMCH. Also known as the Integrated Graphics

Device (IGD).

Hub Interface. The proprietary hub interconnect that ties the GMCH to the ICH4. In this

document HI cycles originating from or destined for the primary PCI interface on the ICH4

are generally referred to as HI/PCI or simply HI cycles.

Host

This term is used synonymously with processor or CPU.

Intel® ICH4

Fourth generation I/O Controller Hub component.

IGD

Integrated Graphics Device. Graphics device integrated into the GMCH.

LVTTL

Low Voltage TTL 3.3 V (SDR).

Primary PCI

The physical PCI bus that is driven directly by the ICH4 component. Communication

between the PCI and the GMCH occurs over the hub interface. Note that even though the

Primary PCI bus is referred to as PCI, it is not PCI Bus #0 from a configuration standpoint.

PSB

Processor System Bus. This is the bus between the GMCH and processor (also referred

to as the Host, FSB, or processor bus).

Scalable Bus

Processor-to-GMCH interface. The Compatible Mode of the Scalable Bus is the P6 bus.

The Enhanced Mode of the Scalable Bus is the P6 Bus plus enhancements primarily

consisting of source synchronous transfers for address and data, and PSB interrupt

delivery. The Intel® Pentium 4 processor implements a subset of Enhanced Mode.

SDR

Single Data Rate SDRAM.

SDRAM

Synchronous Dynamic Random Access Memory.

Secondary PCI

The physical PCI interface that is a subset of the AGP bus driven directly by the GMCH. It

supports a subset of 32-bit, 66 MHz PCI Local Bus Specification, Revision 2.1-compliant

components, but only at 1.5 V (not 3.3 V or 5 V).

SSTL_2

Stub Series Terminated Logic for 2.5 V (DDR).

Document

Document Number/ Location

Intel® Pentium® 4 Processor in 478-Pin Package and Intel® 845G/845GL/

82845GV Chipset Platform Design Guide

298654

Intel® 845G/845GL/845GV Chipset Thermal Design Guide

298655

Intel® 82801DB I/O Controller Hub 4 (ICH4) Datasheet

290744

Intel® Pentium® 4 Processor in the 478-Pin Package Datasheet

249887

JEDEC Double Data Rate (DDR) SDRAM Specification

www.jedec.org

Intel® PC SDRAM Specification

http://developer.intel.com/

technology/memory/pcsdram/

spec/index.htm

Accelerated Graphics Port Interface Specification, Revision 2.0

http://www.intel.com/technology/

agp/agp_index.htm

Digital Visual Interface (DVI) Specification, Revision 1.0

Term

Description

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