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How to obtain 2 different SAI MCLKs

Question asked by Thomas Kofoed Hansen on Jul 7, 2017
Latest reply on Aug 21, 2017 by Thomas Kofoed Hansen

We use the iMX7D with Linux in a design where we need to separate SAI ports as I2S interfaces.

 

One is used as input (SAI1) from ADCs with a master clock of 16.777216MHz and the other (SAI3) is used as output to a DAC with a master clock of 8.388608MHz (16.777216MHz/2). Both ports running simultaneously.

 

The base clock for the MCLKs is an 16.777216MHz precision oscillator connected to CCM_CLK2 input.

 

How do I setup these 2 different MCLKs?

 

Any further documentation on this subject would be appreciated.

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