Introduction

This datasheet is for both the Intel® 82845GE Graphics and Memory Controller Hub (GMCH) and Intel® 82845PE Memory Controller Hub (MCH) components. The 82845GE GMCH is part of the Intel® 845GE chipset and the 82845PE MCH is part of the Intel® 845PE chipset. Each chipset contains two main components: GMCH (MCH) for the host bridge and I/O Controller Hub for the I/O subsystem. The GMCH (MCH) provides the processor interface, system memory interface, hub interface, and additional interfaces in an 845GE / 845PE chipset desktop platform. Both the 845GE chipset and 845PE chipset use the 82801DB ICH4 for the I/O Controller Hub.

Features

■ Host Interface Support

— One processor in a mPGA478 package

— Hyper-Threading Technology support

— 400/533 MHz PSB (100/133 MHz bus clock)

— PSB Dynamic Bus Inversion on the data bus

— 32-bit addressing for access to 4 GB of memory space

— 8 deep In Order Queue

— AGTL+ On-die Termination

■ System Memory Controller

— One 64-bit wide DDR SDRAM data channel

— Up to 2.0 GB of 266/333 MHz DDR SDRAM

— Bandwidth up to 2.7 GB/s (DDR333)

— 64-Mb, 128-Mb, 256-Mb, and 512-Mb SDRAM technologies

— Supports only x8 and x16 SDRAM devices with four banks

— Unbuffered, unregistered 184-pin non-ECC DDR SDRAM DIMMs only

— Two DDR DIMMs, single-sided and/or double-sided

— Does not support double-sided x16 DDR DIMMs

— JEDEC DDR DIMM specification configurations only

— Opportunistic refresh

— Up to 16, simultaneously open pages

— SPD (Serial Presence Detect) scheme for DIMM detection

— Suspend-to-RAM support using CKE

— Selective Command-Per-Clock (selective CPC) accesses

■ Hub Interface

— Supports Hub Interface 1.5

— 266 MB/s point-to-point Hub Interface to the ICH4

— 66 MHz base clock

— 1.5 V operation

■ AGP Interface

— Supports a single 1.5 V Accelerated Graphics Port Interface, Specification 2.0-compliant device

— Supports 1X/2X/4X data transfers and 2X/4X Fast Writes

— 32-deep AGP request queue

— AGP signals muxed with two Intel® DVO ports: Supports ADD cards (82845GE only)

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