Video Interfaces (J14, J21) - Ampro ReadyBoar 800 Reference Manual

Chapter 3

Video Interfaces (J14, J21)

The Northbridge (82855GME) chip provides the graphics control and video signals to the traditional
glass CRT monitors and the LVDS flat panel displays. The chip features are listed below:
• Supports 2D/3D graphics with extensive set of instructions including:
♦
3D rendering and display
♦
BLT operations
♦
MPEG2 decode acceleration
♦
3D overlay
CRT features:
• Supports an integrated 350-MHz, 24-bit RAMDAC to drive a progressive scan analog monitor
and outputs to three 8-bit DACs provide the R, G, and B signals to the monitor
• Supports resolutions up to 1600 x 1200 at 85-Hz refresh, or up to 2048x1536 at 75-Hz refresh
[no reference in data sheet to video frame memory or buffer size, ie. video frame buffer set at
8MB. This includes the type of memory architecture used, ie. Supports a maximum allowable
video frame buffer size of 64MB UMA (Unified Memory Architecture)]
• Supports AGP 4x level graphics performance
LVDS Flat Panel features:
• Supports an integrated dual channel LFP Transmitter interface
• Supports LVDS LCD panel resolutions up to UXGA + (1400x1050)
• Supports a maximum pixel format of 18 bpp (with SSC supported frequency range from 35 MHz
to 112 MHz (single channel/dual channel)
• Supports 1 or 2 channel LVDS outputs
• The 82855GME chip only supports the LVDS port on Pipe B of two pipelines
• Supports the LVDS port independently or simultaneously with the Analog Display (CRT) port
• Supports Spread Spectrum Clocking; center and down spread support of 0.5%, 1%, and 2.5%
utilizing an external SSC clock
• Supports panel up-scaling (to fit a smaller source image onto a specific native panel size) as well
as panning and centering
ReadyBoard 800 Reference Manual
Hardware
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