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TUSB2046B

Kenichi2
Prodigy 90 points
Other Parts Discussed in Thread: TUSB2046B

We are applying  TUSB2046B as figure13 page15 on the datasheet to our system circuitry.
Questions are,
1)While the system power up with USB cables connected into all 4 ports(DM1/DP1~DM4/DP4).
  How about the USB bus power up turn for 4 ports(DM1/DP1→DM2/DP2.......)
2)How about the USB Hand-Shake process complition turn for 4 ports?
   (DM1/DP1→DM2/DP2.......)
Regards,

  • 0
    TI__Guru* 76130 points

    Hello Kenichi,

    Please help me to understand, do you want to know if the hub follows some sequence when powering up the downstream ports?

    Regards.

  • 0 in reply to Elias Villegas M.
    Prodigy 90 points

    Dear, Elias-san.

    I appreciate your reply.

    I believe that 2 kind of process should be executed when the power up for all 4
    downstream ports.
    One is "5V power supply on or off" and another is "USB communication start or
    complete (hand-shake, endpoint setting, transfer mode setting, etc)".

    Exactly, your understanding is correct.
    We want to know the sequence about "5V power supply" and "USB communication"
    sequence for 4 downstream ports when the power up.

    Best Regards,

  • 0 in reply to Kenichi2
    TI__Guru* 76130 points

    Hello,

    I checked on the lab and the TUSB2046B always follows the sequence Port#1, Port#2, Port#3, Port#4 to apply power and to start enumeration as well.

    The below screenshot is from a bus trace at the power-up/enumeration process.

    Regards.