Hi,everyone
I'm a beginner of DSP builder.I am doing a fft work with the fft megacore V7.2.During
my work,I got some problems.I wanna your help.
My problem:
1.I use the streaming mode to do fft.But my frame was not continuous,there are spaces
between the frames(space was set to zero).So the sink_valid signal asserted
simultaneously with the sink_sop asserted and de-asserted with sink_eop asserted.But the
result seem not correct(the source_valid,source_sop and source_eop).If the frame was
continuous(the sink_valid is set to high always),there was no
wrong.So does this mean the
streaming mode can only accept continuous frame?
2.
i changed the mode to variable streaming mode,the result seems right,but the source_sop changed always one clock later than the source_valid.Is this right?(source_eop was right)
3.If the FFT output in the variable streaming mode was right,how can i generate the input control signals of IFFT(sink_valid,sink_sop,sink_eop)?Because the source_sop and source_valid doesn't change(asserted/deasserted) at the same time,so I can't use them for the IFFT input signal.
4.If I send only one frame to the fft core,there is no result(I have run simulate long
enough).Is this a bug of FFT in version 7.2?The user guide does not say that the fft core
should receive more than one frame.
Thanks!!!
