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DS90UB935-Q1: Forward channel GPIOs application question

Part Number: DS90UB935-Q1

Hi Team,

   In datasheet, it  can set the Forward Channel GPIO can be set: 0, 1,2,and 4 as the following picture.

      

    For the application, the 4 forward channel GPIOs will be enabled to transmit I2S signals but it will just use 3 GPIO pins for BCLK, WS and SD as following. Does it mean that the remain GPIO cannot be set to back channel?

Best regards,

Albert Lee.