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This is the DAC from the THDB board

I made this an independent target sucht that it is possible to
overwrite the target in the project specific makefile

The original design of the audio echo example runs with 8 kHz
sampling frequency for longer echo time. I changed this to 48 kHz
sampling frequency. Changed the system clock from 24 MHz to 50 MHz
to have default timing constraints.

Based on the echo example I build an audio interface which provides
the audio interface with parallel data.