I believe the Xilinx CoreGen tool already has a fixed-point
parameterizible FFT core.  Do you need floating-point for some reason?

Stephen

my project leader wants me to fit the elements of Fast Fourier Transfer
including Memory to VirtexII pro board..
to start with he has asked me to map kernel element of FFT and try to
Map it on VIRTEX Pro Board........How will i start from the scratch. I
am new in FFT... any help will be highly appreciated
thanks in advance
Aj