Frame sync duration longer than one frame word?

[giuseppescarpi]

Hello fellows engineers, I have a question about SAI ports in the RT1051 MCU - possibly related with other i.MX products.

The reference manual states that "The sync width cannot be configured longer than the first word of the frame".

So if I have four words of same length, I must configure frame sync to be 25% of the total. With eight words, I need to reduce to 12.5%.

In a custom board, there is an external clock with frame sync width set to 50%. I have no control on this clock.

Unfortunately I still don't have the hardware to perform a test. So the question is: when the SAI is used in slave mode, and the frame sync width violates the directive of the documentation, does anything bad happens?

Thanks

[victorjimenez · Accepted solution]

Hello, 

You must meet this requirement even if you are using the RT as a slave. When it does not comply with it, we cannot ensure the proper functionality of the module at any level.

Have a great day,

Victor

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