• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 1615 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Down stream port Configuration for TUSB8041

Pathireddy Sukumar Reddy
Prodigy 80 points
Other Parts Discussed in Thread: TUSB8041

In one of design i am using TUSB8041 in need to connect USB2.0 interface module on downstream ports in HIGH SPEED Mode.

1.Should i need to connect any pulldown or pullup resistors on datalines ?

2.Connecting an upstream port of TUSB8041to down stream port of TUSB8041 possible.If possible any care to be taken between the interface?

3.Should i require any additional circuit for connecting the UPstream port of TUSB8041 to the PC in both USB2.0 highspeed mode and USB3.0 mode(Any pull ups or pull downs) ?

Can the attached block diagram possible to implement?

Any through put loss occurs/

Regards

P S REDDY

  • 0
    TI__Guru 60870 points

    Hello P S Reddy,

    Feedback on your questions:

    Unused USB 3.0 signal lines do not need to be terminated.

    When directly connecting two USB 3.0 hubs, make sure there are series capacitors on both TX pairs and remember to cross the TX and RX lines like they would be in a USB 3.0 cable.  No external components are needed for the USB 2.0 connections.

    Functionally is it fine to use the TUSB8041 as a USB 2.0 only hub, but please be aware of requirements if you would like to receive a USB logo:

    All ports that are permanently connected to a device or hub must be marked as non-removable in TUSB8041 EEPROM or OTP memory.

    All ports that are not used (routed to a device or a receptacle) must be marked as unused in TUSB8041 EEPROM.

    It is not compliant to route a USB 3.0 capable port to a USB 2.0 only receptacle since the port would still report as USB 3.0 capable.  It would work fine as a USB 2.0 only port, this is a compliance issue only.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 80 points

    Hello JMMN

    Thanks for support..

    If the USB2.0 interface is routed directly to the How the Speed is identified in this case(Low speed,Highspeed)?

    With Regards

    P S Reddy

  • 0 in reply to Pathireddy Sukumar Reddy
    TI__Guru 60870 points

    USB 2.0 connections can be high speed, full speed or low speed.  The host will read the status ports of the hub to determine the USB 2.0 device speed.  Does that answer your question?

  • 0 in reply to JMMN
    Prodigy 80 points

    Hi JMMN,

    Thanks for support..

    Yes Now its clear