Dynamic Frequency Scaling Altera Cyclone IV E(DE0-Nano)

The DE0-Nano board uses a Cyclone IV E device. There are two flavors of the IV E family: N = 1.2V core voltage (VCCINT), L = 1.0V core voltage.

The DE0-Nano board uses a N device (1.2V). If you want lower power find a board with a L device. But for either device the VCCINT voltage is fixed (+/- 3-4%), so you can't vary the core voltage from nominal any appreciable amount. If you tried you may trip the internal POR circuit, although I don't know what the POR thresholds are. The DE0-Nano board doesn't support varying the core voltage anyway, so varying clock frequency is all you can do on this platform.

Good luck with your project.

Bob