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TUSB1211: ULPI trace length / delay spec?

Brian Angiel
Expert 4120 points
Part Number: TUSB1211


Hi team,

The TUSB121X USB2.0 Board Guidelines document, Section 3.02, says that ULPI interfaces should have equal path lengths to have equal delays. I'm curious to know, is there a spec to how much delay variation the interface can tolerate?

Thanks,

Brian Angiel

  • 0
    TI__Guru**** 179576 points
    Brian

    All the ULPI interface signals are synchronous to the clock, so everything is based off the clock. Please refer to ULPI spec, Figure 7 for the ULPI timing diagram, and then you can reference to the setup/hold time requirement in the TUSB1211 datasheet as a guide when doing the routing to make sure setup/hold time does not get violated.

    Thanks
    David