Oscilloscope , High speed Application

The USB-Blaster is too slow for this application.

You will need to use the DE0-nano headers to interface to both your ADC and some other form of communications to your PC.

For example, FTDI have modules with their FT2232H high-speed

http://www.ftdichip.com/products/ics/ft2232h.htm

device on it. Perhaps you could build an adapter board to interface something like this with the DE0-nano.

Alternatively, you could operate your ADC in 'snapshot' mode, where you trigger, capture data to DE0-nano memory, and then transfer it to the PC at a much slower rate.

I'd recommend starting with the 'snapshot' mode since it requires no extra hardware, and then once you have the ADC interface working, decide how to proceed to speed-up the data transfer to the host.

Cheers,

Dave