I’m trying to figured out what trace impedance should be used white DDR3 routung.
According to your stackup:
Trace 0.1mm has 50 Ohm SE
Trace 0.158 has 40 Ohm SE
DDR3 specification gives us examples of “Tree Architecture Without Series Resistors” on command and address lines. (the same as it is used in dev kit). Impedance of these traces should be 40 Ohm.
Data Bus traces should be 50Ohm.
As I understand:
Address lines should have 0.158mm
Data lines should have 0.1mm
Why in “Jetson TK1 Developer Kit Developer Board Design” track width are swapped? (Address: 0.1mm and Data: 0.158mm)
Thanks in advance