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Hi guys, in my current setting i'm using a streaming mode FFT but thats just because it was the default setting. Another mode can help me get rid of serieus M4K-block issues. The system I have setup is like this:
An external ADC is hooked on my Altera DE-1 board. The serial output of this ADC is put in a 12-bit bus and than stacked in a FIFO of 2048 words. When the FIFO is full, the FFT is activated and get's the 2048 samples. When this is done the ADC is activated again.
Should I maybe use the burst, buffered burst mode of the FFT or just stick with streaming?
Thanks in advance!
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I am no expert on current altera fft (but used it a decade ago ! when it was one mode only and I converted it to streaming mode) .
If indeed you can wait stopping the ADC then you can go for burst mode which requires minimum memory. If your ADC bursts are shorter than burst mode then you can go for buffer burst which uses some memory.
If on the other hand you must keep ADC running always then you need to use streaming mode in which case you don't need pre-buffering as it is done inside fft using a lot of memory.
To give you an idea about streaming that I did: I used two fft cores each running after the other plus memory for two frame buffering. first frame of input data was buffered completely then fft1 started meanwhile second frame was passed to its buffer. Once fft1 was done data was output and fft2 starts processing from its buffer while input passed to 1st buffer and so on. Now all this is done by choosing streaming mode avoiding all that trouble.
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