Analog inputs on PYNQ z2 VHDL

I’m totaly new with fpga programming and I’m learning audio DSP
I want to use the analog inputs of the pynq z2 but it’s a little bit confusing the thing of VP and VN, don’t understand if it is a diferential input or a dual single input. How do I read them and take the value of the input to diferent processes? How do I need to conect them? How to use the constraints of the inputs?
I’m programming on VHDL so if someone can give some tips and have a VHDL code and constraints as an example will help so much. Thanks!