Hi Geoff.
Referring to my previous post:
Item 1 should be 'visible' if you scope the PAEN pin. This pin is active when the device is actively transmitting data. When the timeout kicks inn you should see lower duty-cycle on this signal (period should stay the same)
Item 2 add a GIO you can monitor in the LOW-POWER state of the AIC3101. Not sure if you are using the default audio device driver from us for this device, but please see the configurator help menu and 'Audio Device Definition Files' for more info on how to add a signal
Also see the help system for how to set up the thresholds correctly. You will need to determine the noise floor of the system and put the threshold accordingly. The PurePath Wireless Commander and PS_AUDIO_STATS EHIF command is useful for this purpose.
Regards,
Kjetil