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USB high-speed PCB track length matching

Forums › Devices › OSD32MP15x › 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 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 Sheridan
      Keymaster

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

      Thanks,
      Greg

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