DIY DAC using AV Receivers DSP board

Hello friends, I have broken Yamaha RX-V350 AV receiver, it has seperate DSP board inside which has optical inputs and a DAC output to opamps, my question is can I use this board as standalone DAC? As optical input--Line level analog output. As I see, DSP chip has CSL-CLK-SI-SO pins which makes me think if I can control DSP chip using arduino SCLK-MOSI-MISO pins. What do you think? Is there anybody try to do similar project like this? Sorry for my English.
 

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