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46 The PCB Design Magazine • June 2014 tions and generally takes on the same routing distance and topology. One of the advantages of routing the signals this way is that during length tuning (a.k.a. de- lay or phase tuning), the Z-axis length in the vias can be ignored. This is because all the sig- nals routed "the same way" will have exactly the same via transitions and lengths through article RoUTINg DDR3 MEMoRY AND CPU FANoUT continues Figure 2: Signal groups are created on the project's schematic for DDr3 routing. Figure 3: assigning different colors to each group can make routing easier to mentally follow.

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