This is a bit strange, but I loaded up my Verilog code:
http://pastebin.com/guQcNkwp and ran it, I noticed that the Nexys 2
board is making a low intensity, high frequency audible sound. The
frequency and intensity changes between two states depending on if the
LEDs are lit or not. I noticed this a few days ago, but decided to
investigate first before posting. I couldn't come up with any ideas.
The source of the sound is very difficult to find. It seems to
originate from all parts of the board, so moving the board around near
the ear is not helping.

Any ideas?
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