865GV datasheet(21/249 Pages) INTEL

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Intel® 82865G/82865GV GMCH Datasheet

Introduction

DVO Multiplexed Interface

The GMCH supports two multiplexed DVO ports that each drive pixel clocks up to 165 MHz. The

DVO ports can each support a single-channel DVO device. If both ports are active in single-

channel mode, they will have identical display timings and data. Alternatively, the DVO ports can

be combined to support dual-channel devices that have higher resolutions and refresh rates. The

GMCH can make use of these digital display channels via an AGP Digital Display (ADD) card.

1.4.6

Graphics Overview

The GMCH provides an integrated graphics accelerator delivering cost competitive 3D, 2D, and

video capabilities. The GMCH contains an extensive set of instructions for 3D operations, BLT and

Stretch BLT operations, motion compensation, overlay, and display control. The GMCH’s video

engines support video conferencing and other video applications. The GMCH does not support a

dedicated local graphics memory interface; it may only be used in a UMA configuration. The

GMCH also has the capability to support external graphics accelerators via AGP; The IGD cannot

work concurrently with an external AGP graphics device.

High bandwidth access to data is provided through the system memory port. The GMCH can

access local and AGP graphics data located in system memory to 4.2 GB/s (DDR266),

5.4 GB/s (DDR333), or 6.4 GB/s (DDR400) depending on whether single/dual channel memory

configuration.

The GMCH also provides 2D hardware acceleration for block-level transfers of data (BLTs). The

BLT engine provides the ability to copy a source block of data to a destination and perform raster

operations (e.g., ROP1, ROP2, and ROP3) on the data using a pattern, and/or another destination.

Performing these common tasks in hardware reduces processor load, and thus improves

performance. The internal graphics device incorporated in the GMCH is incapable of operating in

parallel with an attached AGP device.

865GV Datasheet(PDF) 21 Page - Intel Corporation