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Visitor zhao008
Visitor
262 Views
Registered: ‎09-19-2018

Using xfft as ifft

There is something with my project . I have read PG109.It said that  I can use the ifft by setting s_axis_config_tdata[0] to 0. But when I setted the  s_axis_config_tdata[0]  to 1 or 0 in my project. There are the same result. Could some tall me what's wrong with my project.捕获.PNG

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2 Replies
Adventurer
Adventurer
198 Views
Registered: ‎01-27-2008

Re: Using xfft as ifft

HI @zhao008 ,

Are you perhaps testing with a real signal? That might give the same results for FFT / IFFT with some scale differences, and be the nature of your observation although I haven't used Xilinx's core myself.

Look into it - it's a good exercise. Try it with Python, Octave or Matlab first.

Have fun,

Jerry

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Xilinx Employee
Xilinx Employee
158 Views
Registered: ‎09-18-2018

Re: Using xfft as ifft

hi @zhao008 ,

Is the FWD/INV field in the config_tdata correctly configured? I see the LSB bit is changed from 0 to 1. Does the LSB bit correspond to FWD/INV field ?

The config_tdata bus width changes based on the FFT configuration, please let me know the config_tdata bus configuration based on your FFT IP configuration ?

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