Softconfig - IODIRB direction is set as output instead of input.

I'm working on ADSP-SC589 ez board. In demo code, AUDIO_JACK_SEL is J6 port which is supposed to be RCA input but IODIRB  { 0x1u, 0x00u } is set as output as shown in figure. Shouldn't IODIRB be  { 0x1u, 0x04u } instead? That is, bit 2 is input and all others are output in U47 port B.  

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