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Adwanced PCB layout course Leeson 4 Length Matching

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  • Adwanced PCB layout course Leeson 4 Length Matching

    Hi Fedevel Academy,

    I have a quastion concerning APLC L4-02.
    During this activity as i understand i should length match DIFF100 and ENET differential pairs within the pair and group. For example in DRAM_BANK0 that 11 nets should have equal signal length. As we can see in this first picture below i should length match this diff pair to reach length equal 17.7mm. But i can't reach that value cause as you can see in the second picture i sould length match iup to 68mm and it's not rigth. M.b. i am douing something wrong or i sould change rules?
    And i would like to say that length within the pair is equal to each other.

    Click image for larger version

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    Click image for larger version

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    Can you please explain to me what should i do?

    Best regards,
    Eduard​

  • #2
    Honestly, I often do not look at the numbers in the bar as sometimes they may show weird things. Is the length matching done from a correct rule? Is not that somehow confused with "within " differential pair rule? I would try to disable the rules and enable them one by one and try them or I would try to length match it based on the numbers in the first pictre and see what would happen with the bar after everything should be length matched correctly

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