Xk_index for FFT 9.0 IP

[mohamed.shfat]

Hello everyone and good evening 

I apologize for being asking a lot of questions recently , but there is something i couldn't understand it very well in the FFT 9.0 core design , which is Xk index at the FFT output or tuser_data as it is called in the core .

I wanna ask that the Xk_index is used for what exactly and how can i make it useful for my design and debugging , i need to understand every point in this core to get the results that i wish , may you help me and explain this point for me please . 

Thanks for everything 

Regrades . 

[balkris · Accepted solution]

there are two index in FFT core Xn_index which is corresponding to input sequence. The other is output sequence Xk_index. These are the basically counter which is corresponding to FFT count size. For 8 point it will count from 0-7 . its basically FFT output point size location location

[balkris]

check page 48 in IP product guide
https://www.xilinx.com/support/documentation/ip_documentation/xfft/v9_0/pg109-xfft.pdf

[mohamed.shfat]

Thanks balkris i got it now . 

regards