Implementation of radix 2 FFT with Cordic in VHDL

[sougata_vlsi13]

I am implementing radix 2 FFT of 8 point in VHDL.During this project i faced the problem of complex addition,subtraction and multiplication.i have also written a code for FFT but that is containing the error of complex part.although ready made ip core is available but i have to write the code.for the sake of my understanding i have implemented the ip core and observe the output.After referring a large number of data sheet i came to know that the problem of complex part can be overcome by cordic.i have implemented cordic ip core also and try to instantiate but my problem dealing with the complex part remains same.Please anybody help me how to get rid of this problem of complex part or is really a cordic aproper solution or not....please help.