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Original question:

TM4C129ENCPDT: use with USB-3

TM4C devices do not support USB 3.0

user5940158
Intellectual 660 points
Other Parts Discussed in Thread: TUSB1310A

Hi team

www.ti.com/.../spmu365c.pdf      In  2.1.3 USB Connectivity,  

USB 2.0 functionality is provided and supported directly out of the box with the target USB micro A/B connector. High-speed USB 3.0 functionality can be enabled by adding an external USB PHY. The USB external PHY control and data signals are provided on the breadboard expansion header X11.

Does Ti provide an external USB PHY product for Usb 3.0?Is there any documents on how to implement external USB PHY?

So for TM4C1294, the USB speed can only reach 12 Mbit/s?

  • 0
    TI__Guru**** 176106 points

    Hi,

      TM4C USB controller is compliant with USB 2.0 standard, not 3.0. This is the clarification I want to make on the MCU USB controller side. Please refer to the datasheet for detail. I also show the excerpt below. 

    I find one USB 3.0 (TUSB1310A) but its status is NRND (not recommended for new designs). I will suggest you post your question to the Interface Forum as experts there will be able to assist you with USB PHY product selection. https://e2e.ti.com/support/interface/f/138. What you need is a PHY that support high speed operation. A PHY that is compliant to USB 2.0 can also support high speed. 

      In the other post you referred, Ralph has pointed a link https://www.ti.com/tool/TIDM-TM4C129USBHS to a TI design that demonstrates high speed with an external PHY. In this TI design, the USB3300 PHY from Microchip is used.

  • 0
    Genius 3945 points

    user5940158 said:
    High-speed USB 3.0 functionality can be enabled by adding an external USB PHY.

    Every time I read this in the TI documentation, I want to submit a bug report!

    USB 2.0 supports High Speed USB.

    USB 3.0 supports Super Speed USB, as well as High Speed, Full Speed and Low Speed.

    If the goal is to support High Speed USB in a design, then a High Speed USB 2.0 PHY suffices. One doesn't need a USB 3.0 PHY.

    user5940158 said:
    So for TM4C1294, the USB speed can only reach 12 Mbit/s?

    With the built-in PHY, that is correct, the part will only support Full Speed USB. It does not support High Speed USB.

  • 0 in reply to Andy Peters
    TI__Guru**** 176106 points

    Hi Andy,

      Thanks for your inputs. We will submit a documentation feedback request to make the correction.