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S32K148 - SAI bitclock slave and polarity

Question asked by Jakub Mielczarek on Feb 13, 2020
Latest reply on Feb 26, 2020 by Jakub Mielczarek

Hello,

 

In my application I need to use SAI0 in bitclock slave mode (bitclock externally generated).

Attached is the relation between external bitclock and external frame sync.

 

When I configure SAI0 transmitter with bitclock active LOW, it works fine. SAI0 transmits data on falling edge of bitclock (is this right?).

 

When I configure SAI0 transmitter with bitclock active HIGH, it does not start to transmit at all. Should it work with the attached signals? If not, what should be changed?

 

Best regards,

Jakub

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