Specifications

Chapter 3 Hardware
46 Reference Manual ReadyBoard 800
Video Interfaces (J14, J21)
The Graphics & Memory Hub (Northbridge) chip (82855GME) 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 25 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.