"- From what I understood, the PLL is generated automatically from the wizard once you have set up the parameters you wanted for your PLL. I have a pll.vhd file which is generated, so I've done a structural file of my entire project which will be my top entity. Is it necessary to do it or is it done automatically thanks to the .bdf graphic file ?"
Hi David,
Specific to your question# 2, is it that you are referring if you would need to add the pll.vhd file to your project? As I understand it, by default, after you create a project and instantiate a PLL, Quartus II will ask if you would like to add it to your project. Once it is added, you should be able to link to the PLL from your top level. alternatively, you can also manually add the file by Settings -> Files, then browse to your design files and add them into the project.