How should DDR ram layouts at PCB?
Mert, Chris Stratton is correct, this is an advanced design topic/challenge and his friendly suggestions on how to go from beginner to being able to successfully do a DDR design are good.  Look at &quot;High-Speed PCB Design Guide&quot; from Sierra Circuits as another starting point, is what I will contribute here.  This is not &quot;EGO&quot;, this is the real world, his suggestions and mine are not useless.  You will need length tuning, impedance matching and possibly simulation, multilayer stackup knowledge, on and on.