Specifications

Chapter 3 Hardware
46 Reference Manual ReadyBoard 800
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:
• Provides 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
• Supports a maximum allowable video frame buffer size of 64 MB UMA (Unified Memory
Architecture)
• Supports AGP 4X equivalent graphics performance
LVDS Flat Panel features:
• Supports an integrated dual channel LVDS flat panel interface
• Supports LVDS flat panel resolutions up to UXGA + (1600x1200)
• 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 panel up-scaling (to fit a smaller source image onto a specific native panel size) as well
as panning and centering
Table 3-16 describes the CRT pin/signals of a standard 15-pin video connector. Table 3-17 describes the
LVDS pin/signals on 30-pins, 2 rows, odd/even (1, 2) with 2 mm pin spacing.