Digital mic sharing on two MCUs

From	John Speth <johnspeth@yahoo.com>
Newsgroups	comp.arch.embedded
Subject	Digital mic sharing on two MCUs
Date	2017-07-31 11:34 -0700
Organization	Aioe.org NNTP Server
Message-ID	<olnt86$1tls$1@gioia.aioe.org> (permalink)

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Hi there-

I have a design inquiry that involves interfacing a pair of digital MEMs 
PDM microphones to two different MCU's (one for wake word processing and 
another for speech processing after waking).  Such a design would 
reasonably require two clock sources to the mic.

Does anybody know what design strategies exist so that PDM mics can be 
shared among different downstream audio processors?

I'm thinking that either a logical or of active MCU clock outputs or 
slaving one MCU clock to the other would do the job.  I certainly don't 
want to add mics due to unnecessary BOM costs.

Thanks - John

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Digital mic sharing on two MCUs John Speth <johnspeth@yahoo.com> - 2017-07-31 11:34 -0700
  Re: Digital mic sharing on two MCUs rickman <gnuarm@gmail.com> - 2017-08-01 10:48 -0400
    Re: Digital mic sharing on two MCUs John Speth <johnspeth@yahoo.com> - 2017-08-01 09:28 -0700
      Re: Digital mic sharing on two MCUs rickman <gnuarm@gmail.com> - 2017-08-01 12:54 -0400
        Re: Digital mic sharing on two MCUs Tim Wescott <tim@seemywebsite.really> - 2017-08-06 13:50 -0500
          Re: Digital mic sharing on two MCUs rickman <gnuarm@gmail.com> - 2017-08-06 19:18 -0400
      Re: Digital mic sharing on two MCUs Randy Day <randy.day@sasktel.netx> - 2017-08-01 19:09 -0600
    Re: Digital mic sharing on two MCUs Mike Perkins <spam@spam.com> - 2017-08-07 14:14 +0100

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