ADAU1442 XMOS problem

Hi

I am trying to interface an xmos usb to adau1442. My setup is. Xmos usb connected to serial data input 0 ant serial data out 0 i have an external dac as asynchronous . So far i have tested the output section with a sinewave generator in the schematic and it working fine. The problem is that when i send data through usb xmos i get nothing. I dont know how to procced to this issue.