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AWR1243: CRC understanding problem

Part Number: AWR1243

Hi,

I would like to ask for some help about CRC in AWR1243.
How do you understand this equation in a message box? I show it on pictures.

I saw a lot of examples and the numbers (x^16 or x^32) mean bits but I have more bytes than four (32bit). Moreover, MSGDATA has a variable length. As I show the next picture.

Could somebody give an example how can I calculate in this example?  

As I saw I should use xor operation, but I do not know in this case. I do not see the connection between these pictures.

Best Regards,

Istvan B.