nRF5340-audio-dk pinout, how to receive UART/SPI data?

Hello,

I would like to input into nRF5340-audio-dk (gateway device) data (around 200KB/s). This data is the sound pre-encoded with LC3.

Where can I find the nRF5340-audio-dk pinout? Here I've found just the nRF5340-DK pinout, infocenter.nordicsemi.com/index.jsp

Which digital interface would be more suitable for this? UART / SPI / I2S?

Ideally, please direct me to a suitable example of this interface. 

Thank you!

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