I'm looking for ideas on something simple to write that I can use to measure power. I just need it to make sure that my power measurement is working. I'm using Xilinx ISE 14.1 on a Virtex-6. I'd like a simple circuit to write and to synthesize.
So far I tried a 1K bit counter, but that wasn't really noticeable. I tried a 9K bit counter, but ISE had trouble synthesizing it (I let it run for an hour before killing it). Now I am trying to implement large BRAMs and keeping them permanently enabled.
I need a way to restrict large vectors from getting optimized so I'd like to xor all the bits together and feed the single bit output to an LED. Is there an easy way to do this for very large vectors?