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DDR3 Routing at different Layer

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  • DDR3 Routing at different Layer

    Hi all,

    I would like to route 2 DDR3 IC signals with fly-by routing topologies. Could you help me about the below questions that confuse me?
    1. Can ı route DQ signals at different layers ? (Total length will be same)
    2. Can ı route Address signals at different layers ? (Total length will be same)
    ​Regards

  • #2
    1. Personally, I have never done this and I would not do that (routing signals from one DQ group on multiple layers)
    2. I have done this

    Check DDR3 memory JEDEC reference designs. I think some of them have address routed on multiple layers

    However I try to avoid this approach as it is tight up to a specific stackup. Any changes in stackup may influence length matching.

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