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DM8168 - USB 3.0 support

K Md Feroz Irfan
Expert 7225 points
Other Parts Discussed in Thread: TUSB8040

Hi Champs,

Can we interface TUSB8040 (USB 3.0) with DM8168 (USB 2.0)? We are looking for Multi speed support including High Speed Functionality. If TI has any other device (HUB) please suggest?

Best REgards

Feroz

  • 0
    TI__Expert 7225 points

    A clarification here:

    Question is: "We would be working the TUSB8040  as a USB2.0 ,  now since USB is built backward compatible (3.0 to 2.0) we think it should work.   We do not need 3.0 features support just backward compatibility?"

    TUSB8040 should work with USB 2.0 host since USB 3.0 std is backward compatible and supports USB 2.0. Super speed may not be possible and its ok for you.

    The TUSB8040 provides simultaneous SuperSpeed and high-speed/full-speed connections on the upstream port and provides SuperSpeed, high-speed, full-speed, or low-speed connections on the downstream ports. When the upstream port is connected to an electrical environment that only supports high-speed or full-speed/low-speed connections, SuperSpeed connectivity is disabled on the downstream ports. When the upstream port is connected to an electrical environment that only supports full-speed/lowspeed connections, SuperSpeed and high-speed connectivity are disabled on the downstream ports.

    Best Regards

    Feroz

  • 0 in reply to K Md Feroz Irfan
    Guru 31670 points

    Feroz,

    I didn't understand one thing. What is the point in connecting this hub to a 2.0 host controller? Anyways DM816x doesn't support 3.0, so a 2.0 supporting hub will be enough?

  • 0 in reply to Renjith Thomas
    TI__Expert 7225 points

    Hi Renjth,

    We needed USB High speed. However the TI Hub chips we have are all full speed and one is Superspeed (3.0).

    So the only option for using here is using the hub with 3.0. However DM8168/Netra does not have 3.0 support. So the question is "Can DM8168 support being connected to a USB 3.0 based hub upstream"?

    I did see that on the product page of the Hub. It seems that the TUSB8040 should work with USB 2.0 host upstream – as per its description below. Super speed may not be possible and it’s ok for you.

     

    The TUSB8040 provides simultaneous SuperSpeed and high-speed/full-speed connections on the upstream port and provides SuperSpeed, high-speed, full-speed, or low-speed connections on the downstream ports. When the upstream port is connected to an electrical environment that only supports high-speed or full-speed/low-speed connections, SuperSpeed connectivity is disabled on the downstream ports. When the upstream port is connected to an electrical environment that only supports full-speed/lowspeed connections, SuperSpeed and high-speed connectivity are disabled on the downstream ports.

     

    Does this mean that  the scenario can work?

    Best Regards

    Feroz

  • 0 in reply to K Md Feroz Irfan
    Guru 31670 points

    Feroz,

    Are you very particular about TI USB hub solution? Have you explored using SMSC USB hub solutions. This is used in beagleboard-xM

    K Md Feroz Irfan said:

    The TUSB8040 provides simultaneous SuperSpeed and high-speed/full-speed connections on the upstream port and provides SuperSpeed, high-speed, full-speed, or low-speed connections on the downstream ports. When the upstream port is connected to an electrical environment that only supports high-speed or full-speed/low-speed connections, SuperSpeed connectivity is disabled on the downstream ports. When the upstream port is connected to an electrical environment that only supports full-speed/lowspeed connections, SuperSpeed and high-speed connectivity are disabled on the downstream ports.

    I think this should work. 

  • 0 in reply to Renjith Thomas
    TI__Expert 7225 points

    Ok thanks Renjith!

    Yes customer likes to use TI chips only.

    Best Regards

    Feroz