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TUSB542: TX pin and Rx pin

K.Hamamoto
Guru 12155 points
Part Number: TUSB542

Hi

I have a simple question. 

About TX pin and RX pin, there are input pin and output pin. How can we connect the those pin to the host?

At the following diagram, it is shown that TX pin(TUSB542) and TX pin(HOST) is connected.

(RX pin(TSUB542) and RX pin(HOST) is connected as well)

 

In general, TX pin(HOST) is connected to RX pin(downstream device). And RX pin(HOST) is connected to TX pin(downstream device).

In the case of TUSB542, Is the pin name of TUSB542 just corresponded to the pin name of HOST? 

I am sorry for asking such a simple question. Because I got confused.

Regards,

Koji Hamamoto

  • 0
    TI__Mastermind 36085 points

    Hello Hamamoto-san,

        I understand your confusion, and first a Would like to clarify the point: Usually On USB3 the TX pins are connected to RX (HOST -> DEVICE).

        On the other hand, the TUSB542 is a SWITCH & RE-DRIVER and has receivers & drivers. However, its pin names were assigned in order to match a passive switch, so the TX from the HOST has to be connected to the named TX_AP(actually an INPUT), that is internally switched to the named TX_CONN (actually OUTPUTS) pins, afterwards connected to the TX connector pins (TX labeling all way from Host to connector and the same for RX path).

        I hope it is clear enough.

    Best regards,

    Diego.

  • 0 in reply to Diego Cortes
    Guru 12155 points
    Hi Diego-san,

    Thank you!