idle: a 32kHz block-audio buffer will convert from 22kHz PCM, as 11 to 16 samples, w/ an 0.23% drop in playback speed. seems acceptable.
Of course you can actually implement the DMAC as a uC core running a polling loop and doing MMIO, but it's more efficient not to. :-)
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it is still a bit of an open issue if I will be able to fit all this into a 25k cell FPGA; may need something bigger (thus, more expensive).
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side note: my current working goal is basically, something that could run Quake, but fitting into a moderately lower-end FPGA.
End of conversation
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