After fixing some problems in the FFT IP core v 9.0, i got another trouble here .
My problems are in the natural order output signal , and the reversed order with harmonics ! When i set my output core to reversed bit order i get a results but not only two peaks , i get another peaks or harmonics as it called ! In the same time when i change it to the natural order i get nothing from the core ! just an empty window with no peaks such as shown in the pics below .
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mohamed shffat
Hello
After fixing some problems in the FFT IP core v 9.0, i got another trouble here .
My problems are in the natural order output signal , and the reversed order with harmonics ! When i set my output core to reversed bit order i get a results but not only two peaks , i get another peaks or harmonics as it called ! In the same time when i change it to the natural order i get nothing from the core ! just an empty window with no peaks such as shown in the pics below .
Details of my FFT core :
512 points scaled with SCALE_SCH = [01 10 10 10 11]
forward FFT and real time mode .
Target CLK 100 MHZ and 50 MSPS out .
Fixed point
Pipelined streaming I/O .
Input 16 bit width comes from XADC 1MSPS .
1st pic show the results comes in reversed order , 2nd pic shows the natural order results .
And the input of the core is a sinusoidal wave sampled with XADC core .
If someone have any idea of what is going on here I would really appreciate the help!
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