Split radix FFT algorithm

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sougata_vlsi13

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I have implemented radix 2 and radix 4 FFT algorithm but without using cordic.Now i moved upto split radix..problem is that i am not getting a proper flow diagram such as a butterfly structure as in radix 2 and radix4...can any one provide any good related document for this and what is actually the basic difference between rad 4 and the split one .
 

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