Xilinx System Generator Accumulator generating NaN output
I am doing my M.tech main project on FPGA implementation of MFCC(Mel Frequency Cepstral Coefficient) extraction for audio analysis. To convert the FFT spectrum into mel scale, i am doing a multiply and accumulate operation between the FFT magnitude spectrum and the filter bank coefficients. But the accumulator is generating NaN outputs even though the multiplier is generating a valid output. I have attached my design along with a single frame of the audio signal along with the window and a single set of filter bank coefficients. Please help, Thank You.