Thank you for your answer FvM.
No, I'm not sure everything is well configured. I am new to this board and it is true that I have difficulty finding or decrypting information about this reference clock. I'm trying to make a Standalone application to manage RF converters. (Hardware on Vivado, use the API drivers to check the correct configuration). As far as clkout5 is concerned, I don't really see how to program it. There are very few examples of clocks programming. I want to use the ADCs at a sampling frequency of 4 GHz. But for this clock reference I'm blocking.
Thank you.