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TUSB211: About USB2.0 communication signal waveform

Sho Ogane
Genius 5575 points
Part Number: TUSB211

Hi all

My customer uses TUSB211.
I show the customer constitution below.
PC(Host)<===USB2.0 cable 5m===>Device(TUSB211<===USB3.0 cable 3.0m===>Control board)

Now the application can't connect to PC(Customer application does not recognize PC).
Looking at the communication waveform, there is something like a noise on the waveform.
So my customer disable the TUSB211, the communication wave was improved.

If TUSB211 is doing unfavorable movements, what could you  consider in this case?

If the supply voltage and current of TUSB211 have the noise, is comunication waveform affected by this noise?

Sorry I would like to get your comment as soon as possible.

Best Regards,
Sho

  • 0
    TI__Mastermind 36085 points

    Hello Sho,

    This case would require 2 TUSB211, also I am concerned about the DC loss in the channel. Please share how the customer implemented the test without re-driver. Did they use an 8m cable? If so, then it is an unfair comparison due to the loss in the TUSB211 board + extra connectors.

    Regards,

    Diego,

  • 0 in reply to Diego Cortes
    Genius 5575 points

    Diego san
    Thank you for your comment.

    Sorry, customer test condition is typo,
    PC(Host)<===USB2.0 cable 5m===>Device(TUSB211<===USB3.0 cable 1.0m===>Control board)

    I attache the eye pattern, connection waveform(using TUSB211: Enable, not using TUSB211:Disable) and test condition.
    As long as I am looking to the eye pattern that TUSB211 is enabled, the DC loss is improved by TUSB211,
    and my customer passed the eye pattern compliance test.
    However customer application does not recognize PC.
    I think that the cause is the noise.

    So please give me your comment as soon as possible,

    Best Regards,
    Sho 
    TUSB211.pdf

  • 0 in reply to Sho Ogane
    TI__Mastermind 36085 points

    Thanks for the update Sho,

    Could you upload the eye measurements at the second measuring point, also it would be great if we have USB traces to see exactely what is going on during the enumeration. As far as I can see the TUSB211 seems to be doing the job well, it is compensating the signal.

    Regards,

    Diego