Datasheet

Intel
®
82845G/82845GL/82845GV GMCH Datasheet 19
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