I am reading JEDEC DDR3 specification, and so many other documents on DDR3 guidelines. Before I move to pcb prototyping, I just need a confirmation.
I connected all my lines, respected the grouping, length matching, impedance matching, via size. My DDR3 type is 1333.
If I keep the CPU and Memory IC close (less than 2 cm), do I need to take care of trace length (I mean their absolute length, not their matching)?
My opinion is that it doesn't matter because the current travels at half the speed of light on a FR4 pcb board. Even 1cm more should not matter much. And my SDRAM controller will take care of the rest of the details for me.