Author Topic: Memory bus termination: ultra short distance edition.  (Read 699 times)

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Offline technixTopic starter

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Memory bus termination: ultra short distance edition.
« on: September 10, 2018, 04:11:12 pm »
I am tackling the memory bus again, this time on a board designed to be tiny. The topology here is a point to point connection between an Allwinner A13 and a MT41K256M16HA DDR3 memory chip running at DDR3-1066 (The memory chip is overclocked but I am running an DDR3L chip at DDR3 voltages anyway.) I have managed to figure out a layout that is free of vias (top side wiring only) and the maximum trace length is about one centimeter. Do I still need the 24 ohm series termination resistors as specified on Allwinner reference design and Micron technical manual TN4614, or can I just ignore all of it and use whatever on-die termination Micron shipped on that chip?

On a related note, does SODIMM modules usually comes with all the termination already in place?
 


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