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same fft input frame must produce same output frame.
check you are missing one or so data or inserting a zero in input or cutting it short or duplicating ...etc at the point you change to second frame. Very common. check directly at input to fft and not somewhere ahead.
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Thank you for your quick reply!
I have be working on this FFT Megacore beyond 5 days and compared its results with results from MATLAB. All output data flows are correct and the source_error signal is always zero which means, I guess, the FFT Megacore are working normally. Also, I am very sure I used a same block of input data between the sink_sop and sink_eop since I have checked the same data block many times.
In fact, Now I tend to believe that it is a bug of the FFT Megacore function.:(
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