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XMOS i2s DAC issue

ACharnley

Member
I build a USB->I2S->DAC based on the CM6631A into a PCM1794A. It works well.

I later picked up a Moonshadow XMOS USB board. I couldn't make the i2s work (no audio output at all). I've now measured the i2s clock lines as:

CM6631A

LRCK -> 44.1Hz
SCK -> 11.23MHz
BCK -> 5.64MHz

XMOS

LRCK -> 44.1Hz
MCK -> 22.72MHz
BCK -> 2.8MHz

You'll notice the XMOS doesn't have a SCK output but originally I thought MCK was just another naming convention.

Any i2s experts out there willing to drop a clue?
 

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