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Original question:

TUSB8020B: New PCB design doesn't connect to upstream

TUSB8020B: test pattern for TUSB8020B

Ben Kuo
Expert 7570 points
Part Number: TUSB8020B

Dear team,

Customer use our TUSB8020B for Hub application.

If host send out test pattern to TUSB8020B and there are no downstream device.

Can the test pattern be measured at output side?

test set up:

[Host]--test pattern--> TUSB8020B-->probe measurement-->( no downstream device)

Regards,

Ben

  • 0
    TI__Guru 60870 points

    Hi Ben,

    The hub will not automatically route the test packets to the downstream ports.  The customer will need to use a USB compliance tool like the XHCI HSETT tool from usb.org  to enable the downstream ports of the hub to generate a test packet.

    Regards,

    JMMN