I'm still looking for an answer to this question I posted below.
My question is what is the preferred PCM3070 Pure Path topology for switching between an analog input and a digital I2S input?
Can I use a MUX to switch between the analog and digital inputs?
What is the preferred clocking method?
Should I use the recovered MCLK from the DIR9001?
I have a PCM3070EVM-K eval board connected to a DEM- DIR9001 eval board via CN005 of the DEM board and J14 of the TAS1020 USB controller. I have a PPS topology that switches, with a mono mux (2 to 1) between an analog input and the DIR9001 I2S output. The audio switches correctly between the analog input and the I2S input but when I disconnect the S/PDIF input to the DIR9001, the audio then becomes garbage. To restore the correct operation, I need to Build "disconnect" with the PPS and Build "download code" again (to get to blue screen). What am I missing?
I'm looking into this and will respond
Apologies for the delay. I would assume that the DIR9001 is providing the MCLK via SCKO which is recovered from the S/PDIF input stream. So when the S/PDIF input is pulled, the master clock is no longer provided. PurePath Studio will continue working so long as everything has been loaded already, however any I2C commands attempted during that time will not go through to the intended devices. The mux works correctly whlie the S/PDIF is plugged in and analog input is now chosen, but in this use-case a different master clock then needs to be supplied to the PCM3070, otherwise when the S/PDIF is pulled out, there will be no master clock provided for it and audio data will be lost.
Thomas, did this address your question?
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