Hi @FAdar.1 ,
The USB implementation is not the same for all STM32 products. So, the required hardware setup will depend on the product you selected.
There are several Hardware guidelines for USB implementation detailed in AN4879 that covers power setup, clock setting and several others.
Have a look to it, I believe it will help you. If you think that there are some missing details for this application note, just keep me informed so that it can be considered in a future update of this document.
-Amel
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