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USB high-speed PCB track length matching

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    • March 14, 2022 at 12:08 pm #12137
      Gil Hershmangil_he
      Participant

        hello,

        According to AN5031 document by ST (Getting started with STM32MP151, STM32MP153
        and STM32MP157 line hardware development), page 69:
        “Each package has been optimized to provide easier length matching when differential balls
        pair signals are not directly on adjacent balls.”.

        Same situation takes place in the OSD32MP153C-512M-BAA.
        Is there an internal package length difference I can take into consideration while routing USB_DP2 and USB_DM2?

        thanks
        Gil

      • March 15, 2022 at 11:35 am #12154
        Neeraj Kumar Reddy DantuNeeraj Dantu
        Moderator

          Gil,

          Please see requested information below:
          USB1
          USB1_N 15379.511 559.346
          USB1_P 14820.165

          USB2
          USB2_N 18453.704 572.107
          USB2_P 17881.597
          Note that all lengths are in microns.

          Best,

          Neeraj

        • March 15, 2022 at 12:20 pm #12157
          Gil Hershmangil_he
          Participant

            hello Neeraj,

            I am sorry, but I do not understand your answer.
            What do the numbers represent?
            USB2_N has two numbers. USB2_P has one number.

            I need the routing length difference, inside the SIP package, between USB_DM2 and USB_DP2.

            thank you
            Gil

          • March 15, 2022 at 1:47 pm #12161
            Greg SheridanGreg Sheridan
            Keymaster

              Hello Gil,
              Please see this post that covers your question.

              Thanks,
              Greg

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