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Now, I have my DE2-115 which brings with it many more LE and some more "modern" I/O for me to learn to use. When I went to try out my new system, however, I found out my VGA module no longer works!
I've found a new pin that was not present on the DE1: VGA_CLK.
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The DE1 has a simple VGA interface. The DAC, that convert the color output from digital to analog, is just a resistor ladder.
DE2 boards don't use a resistor ladder anymore. They include instead a dedicated DAC chip manufactured by AD. This chip requires the new VGA_CLK signal.
There a few extra signals involved that you need to take care, such as VGA_BLANK, VGA_SYNC, and the color bit depth was also increased. Check the DAC datasheet and the schematics.
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