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TUSB1002: cascading

Hanno Reimer
Intellectual 1630 points
Part Number: TUSB1002

Until now we have been using your USB 3.0 hubs to amplify the signal.
Currently there is a re-design and we would like to get away from the hub and use your Redriver TUSB1002.

For first tests we have ordered 2x TUSB1002EVM.
We have the phenomenon that with one Eval board the USB 3.0 hard disk is recognised properly and the writing/reading works well.
But if we connect both Eval boards in series, the hard disk is only recognised with USB 2.0 or not at all.

Can you please help us? What are we missing? Can't two Redrivers be cascaded?

  • 0
    TI__Guru 64326 points

    Hi,

    Are you using TUSB1002 or TUSB1002A? Also what are the cable lengths being used in-between the EVMs 

  • 0 in reply to Malik Barton57
    Prodigy 10 points

    We using the TUSB1002 (TUSB1002EVM).

    The cable lenght between the two TUSB1002EVM is 1.5m.

    From Host PC to the first TUSB1002EVM is 1.5m and from Device (HDD) to second TUSB1002EVM is 20cm.

    The answer that we need is very urgent!

    thanks

    Peter

  • 0 in reply to Peter Omlor
    TI__Guru 64326 points

    Hi Peter,

    I suspect you will need to use the TUSB1002AEVM. TUSB1002A has a different voltage reference (GND) for is RX terminations. TUSB1002 RX terminations can cause interop issues. I would also ensure that EQ is not maxed on both EVMs. It is also possible that you may not need two redrivers for this test setup, typically hubs support up to 3m Type-A/B cables and the data stream is over equalized. You can confrim this be using a sliglty longer cable between the redrivers.