[openip] idea of fft

[salmon <salmon@chinaren.com>]

dear friend:
   i made a fft core in fpga recently;but it is in normal way;
i a have a idea of double the speed of fft: in xilinx's fpga,the block dpram can read while write,so we can use this ablitly to double the i/o speed of dpram,in one clock can finish one buttly.but i can't find the way of the address changing,it is diffriend from normal way.
   the key: address changing   
(my english is not good ,sorry)
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