FFT IP MATLAB C-model seems not bit true

Hi,

As I understand it, you have some inquires related to the FFT Matlab model simulation output has discrepancies compared to Modelsim simulation. Thanks for the detailed explanation.

I am still in the progress of downloading the ZIP that you shared.

To ensure we are on the same page, just would like to check with you on the following:

1. Just would like to check with you which Quartus version and FPGA device that you are using?

2. Would you mind to further elaborate on the difference that you are observing with the output data? Some screenshots and your expectation would be helpful.

3. Just wonder if you are expecting the output values are exactly identical number? If yes, for your information, based on my previous experience, the Matlab output might have difference in term of magnitude vs HDL simulation. This might be due to scaling or rounding difference between the tools and models.

4. Although magnitude might be different, generally the peak frequency would be almost similar. Just wonder if you are observing that the peak frequency are far off between Matlab vs HDL simulation? Or if you are observing the plots have significant difference in shape?

Please let me know if there is any concern. Thank you.

Best regards,

Chee Pin