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SPI communication

Honored Contributor I

I am using a STREAM FPGA board connected to an RF board. 


Up until now, Quartus has been able to output frequencies to the NCO IP. 


Next, I want to send the output frequency to the transmitter of the RF board and confirm it through the spectrum analyzer. I do not know how to connect the two boards (RF, STREAM).  


I do not understand why the downloaded user guide uses SPI techniques.  


I would like to get good advice or related guidance for me.
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