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TUSB8040A1 question

Other Parts Discussed in Thread: TUSB8040A1

Hello,

My customer has some questions.

He wants to make a test board for checking the Host Controller's signal line condition.

(Ex. Open/Short another line)

Then he uses  the TUSB8040A1.

He try to operate the TUSB8040A1 without Downstream ports,only Upstream ports, Power supply, CLK, Reset function used.

Q1) Can Host Controlle read the Vendor ID and Product ID of the TUSB8040A1?

Q2) If Host Controller can read the ID, is the signal line condition good?

( I think there is a simple way to check a signal line condition..... )

Regards,

Naoki Aoyama

  • Hello,


    Yes, the TUSB8040A1 can be used on a test board.  In this case, do not mark all downstream ports as "unused" since a "no port" hub may not be loaded properly by the host driver.   The hos can read the PID/VID of the TUSB8040A1 to determine signal quality. The TUSB8040A1 reports a different PID on the USB 2.0 and USB 3.0 buses, this is a Microsoft requirement.  The TUSB8040A1 also supports status outputs that can be used to drive LEDs for a visual notification of the upstream port status on the TUSB8040A1.

    Regards,

    JMMN

  • Hi, JMMN

    Thank you for your fast response. I will feedback to may customer this information.

    Thanks,

    Naoki