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Chapter 3
Video Interfaces (J3, J26)
The 855GME chip provides the graphics control and video signals to the traditional glass CRT monitors
and LCD flat panel displays. The chip features are listed below:
CRT features:
• Supports a max resolution of 1600 x 1200 with video frame buffer set at 8MB
• Supports a maximum allowable video frame buffer size of 64MB shared memory
• AGP 4X graphics performance (always enabled)
Flat Panel features:
• Supports (+3.3V or +5V, and +12V) output to LCD flat panels through a LVDS interface
• Supports panel sizes from VGA (320x480) up to SXGA+ and UXGA+ (1400x1050).
• Supports VGA and SVGA panels with 9-, 12-, or 18-bit (1 Pixel/Clock)
• Supports 1 or 2 channel LVDS outputs
CRT Interface
Table 3-23 describes the pin-outs and signals of the CRT interface and it has 10 pins, 2 rows, odd/even,
(1, 2) with 0.100" pin spacing.
Table 3-23. CRT Interface Pin/Signal Descriptions (J3)
Pin #
Signal
1
RED
2
GND
3
GREEN
4
GND
5
BLUE
6
GND
7
HSYNC
8
GND
9
VSYNC
10
PWR
Note: The shaded area denotes power or ground.
54
Description
Red – This is the Red analog output signal to the CRT.
Ground
Green – This is the Green analog output signal to the CRT.
Ground
Blue – This is the Blue analog output signal to the CRT.
Ground
Horizontal Sync – This signal is used for the digital horizontal sync
output to the CRT.
Ground
Vertical Sync – This signal is used for the digital vertical sync output to
the CRT.
Power – Provided through fuse (F1) to +5 volts +/- 5%. F1 is next to J3
connector on board.
Reference Manual
Hardware
LittleBoard 800
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