845GL datasheet(19/193 Pages) INTEL

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

Introduction

The graphics features on the GMCH include:

1.4.6

Display Interfaces

The GMCH provides interfaces to a progressive scan analog monitor and two DVOs (multiplexed

with AGP) that can drive an ADD card. The digital display channels can drive a variety of DVO

devices (e.g., TMDS, LVDS, and TV-Out).

• The GMCH has an integrated 350 MHz RAMDAC that can directly drive a progressive scan

analog monitor up to a resolution of 2048x1536 at 60 Hz.

• The GMCH provides two multiplexed DVOs that are can drive a 165 MHz pixel clock. The

two DVO ports can be combined to drive larger digital displays.

The GMCH is compliant with the Digital Visual Interface (DVI) Specification, Revision 1.0

(www.ddwg.org/register/download.htm). When combined with a DVI-compliant external device

and connector, the GMCH has a high-speed interface to a digital display (e.g., flat panel or digital

CRT).

• 3D Setup and Render Engine

— Discrete Triangles, Strips and Fans Support

— Indexed Vertex and Flexible Vertex Formats

— Pixel Accurate Fast Scissoring and Clipping

Operation

— Backface Culling Support

— Supports D3D and OGL Pixelization Rules

— Anti-Aliased Lines Support

— Sprite Points Support

• High Quality Texture Engine

— Per Pixel Perspective Corrected Texture

Mapping

— Single Pass Texture Compositing (Multi-

Textures) at rate

— 12 Levels of Detail MIP Map Sizes from

1x1 to 2Kx2K

— All texture formats including 32-bit RGBA

— Alpha and Luminance Maps

— Texture ChromaKeying

— Bilinear, Trilinear, and Anisotropic MIP-

Mapped Filtering

— Cubic Environment Reflection Mapping

— Embossed Bump-Mapping

— DOT3-based Bump-Mapping

— DXTn Texture Decompression

— FXT1 Texture Decompression

• 3D Graphics Rasterization Enhancements

— 200 MegaPixel/Sec Fill Rate

— Flat and Gouraud Shading

— Color Alpha Blending for Transparency

— Vertex and Programmable Pixel Fog and

Atmospheric Effects

— Color Specular Lighting

— Z Bias Support

— Dithering

— Anti-Aliasied Lines

— 16- and 24-bit Z Buffering

— 16- and 24-bit W Buffering

— 8-bit Stencil Buffering

— Double and Triple Render Buffer Support

— 16- and 32-bit Color

— Destination Alpha

— Maximum 3D Resolution Supported:

1600x1200x32 at 85 Hz

— Fast Clear Support

• 2D Graphics

— Optimized 256-bit BLT Engine

— GDI+* Feature Support

— Alpha Stretch Blitter

— Anti-Aliased Lines

— 32-bit Alpha Blended Cursor

— Programmable 3-Color Transparent Cursor

— Color Space Conversion

— 8-, 16- and 32-bit Color

— ROP Support

• Video DVD/PC-VCR

— Dynamic Bob and Weave Support for Video

Streams

— Synclock Display and TV-out to video source

— Source Resolution: up to 720x480 with

2-vertical taps

— Software DVD at 30 fps, Full Screen

• Video Overlay

— Single Scalable Overlay

— Multiple Overlay Functionality provided via

Stretch Blitter (PIP, Video Conferencing, etc.)

— 5-tap Horizontal, 2-tap Vertical Filtered

Scaling

— Independent Gamma Correction

— Independent Brightness/Contrast/Saturation

— Independent Tint/Hue Support

— Destination Color-keying

— Source Chroma-keying

— Maximum Source Resolution: 720x480 (576)

— Maximum Overlay Display Resolution:

1600x1200x32 at 60 Hz and 1280x1024x32

at 85 Hz

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