I am using an ADSP-21479 that has SPORT 0 frame sync routed to pin DAI_P04 as follows:
I have the control register configured as follows (active high frame sync):
SPCTL0 = SPTRAN | SLEN32 | FSR | IFS | BHD
I do not plan on enabling the SPORT until I am ready to transmit data. I was expecting to see pin DAI_P04 being driven low since the frame sync is not active yet because there is no transfer in progress but instead I see the pin high.
Is the frame sync pin (DAI_P04) only going to be driven when the SPORT is enabled? If the SPORT is not enabled does the pin float?