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TAS5825MEVM-SB: How to see the waveform of TAS5825M SDOUT for audio monitoring and echo cancellation

Simon Yuh
Prodigy 100 points
Part Number: TAS5825MEVM-SB
Other Parts Discussed in Thread: TAS5825M

Dear sirs, 

I'm using the TAS5825MEVM-SB, I want to check the audio stream of SDOUT for audio monitoring and echo cancellation.

but I can not see any waveform on the SDOUT pin (TAS5825M's pin11_GPIO2) when I try to adjust the GUI of Output Crossbar.

Are there anything else I need to configure if I want to monitor the digital loop back signal for AEC reference ? Thanks !