Nexys2 ADC (base of an oscilloscope)

I interfaced two AD7893 AD converters to the Nexys 2 FPGA board. AD7893 uses SPI to communicate. It can convert with frequency of 125 kHz and display through VGA interface at 800x600@75Hz. The Nexys2 board can be controlled over serial (RS-232) line as well. So it is a base of a computer controlled oscilloscope. However the gain cannot be changed.

VHDL files can be downloaded here. Eagle files of PCB is here.

Demonstration of working:

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