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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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