added audio interface with echo example
Based on the echo example I build an audio interface which provides the audio interface with parallel data.
pnr/de1_audio/makefile
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sim/de1_audio/makefile
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src/adcintf.vhd
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src/audio.vhd
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src/bclk.vhd
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src/dacintf.vhd
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src/de1_audio.vhd
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src/fsgen.vhd
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