7 i2s digital output (dao mux output), 3 dc power input, 4 usb connector – Cirrus Logic CK4970x4 User Manual

Page 14: 5 mcu programming header, 6 reset button, 7 buttons and knobs, 8 dao mux select header, 7 i2s digital output (dao mux output) -7, 3 dc power input -7, 4 usb connector -7