I'm trying to find a 64-point FFT/IFFT core. Target is Actel IGLOO family. 
Needs to run fast enough to complete in 3.2us, which is tough in an IGLOO. 
Actel has a free FFT core but it is not quite fast enough. It's a radix-2 
core, which is not optimal for this application. Radix-4 would be better.

I've looked at the cfft core on Opencores and it may work for us, but also 
want to check commercial options.

Thanks,
Rob