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66AK2H12 USB

B. Bowling
Prodigy 195 points

Other Parts Discussed in Thread: 66AK2H12

The USB on the 66AK2H12has two sets of signals: (USBDM and USBDP), and (USBRX0M, USBRX0P, USBTX0M, USBTX0P).

I suspect that the first set supports USB 2.0 which the second set supports USB 3.0.  Is this correct.  In my case I want to support USB 2.0 OTG.  Which signals do I use and what do I do with the unused signals.

The datasheet mentions a Universal Serial Bus 3 (USB3) for KeyStone II Devices User Guide (SPRUGP1) but this can’t be found on the TI web site. Is this available?

There are also two signals USBCLKM and USBCLKP, how are these handled for USB OTG?

Thanks - Bruce

  • 0
    TI__Intellectual 1805 points

    The USB3.0 standard is backward compatible with USB2.0  ---- support all operation modes, including LS, FS, HS, and SS <super-speed mode, a new mode introduced by USB3.0>. So, USB3.0 interface covers all USB2.0 interface signals <such as the USBDM and USBDP>, plus some new signals specific for the superspeed mode <the USBRXM/USBRXP and USBTXM/USBTXP> ---- all those signals are part of the interface of USB3.0 standard.

    If a customer's design will support all USB modes, including LS, FS, HS, and SS, then, all those signals have to be used <routed to the USB connector on the board>.

    If a customer's design will support only LS, FS, and HS <low-speed, full-speed, and high-speed are USB2.0 supported modes>, except the SS mode, then, the USBRXM/USBRXP and USBRXM/USBTXP pins won't be needed to route to USB connector on board.

    Regarding to USBCLKM/USBCLKP, those are the input clock pins for the PHY reference clock (needed for both USB3.0's the SS mode,  and the USB2.0 modes). User needs to provide a such clock. 

    Regarding to the feature of OTG, specific to 66AK2H23, this is not supported. But new devices will have this feature enabled.

    Regards!

    Wen

     

     

     

     

  • 0 in reply to Wenzhong Liu
    Prodigy 60 points

    Wen,

    I am Scott Walker at Quasar Systems Inc.  I'm Bruce's (originator of this question) customer and I'm the person who originally asked this question.  I have a further follow up question.  You mention that "new devices will have this feature enabled".  Is this an errata in the present 66AK2H12 or are you referring to a different device.  If a different device, will it be pin compatible with the 66AK2H12?

    Regards,

    Scott

  • 0 in reply to Scott Walker
    TI__Guru* 85175 points

    Hi Scott

    Scott Walker said:
    You mention that "new devices will have this feature enabled".  Is this an errata in the present 66AK2H12 or are you referring to a different device.  If a different device, will it be pin compatible with the 66AK2H12

    Right now the OTG feature is not tested and therefore not supported on 66AK2H12 device family. What Wen alluded to is indeed a different set of roadmap devices , so they are not pin compatible. I do expect that at some point by 2Q next year we might have additional update on whether or not OTG can be supported on 66AK2H12 family.

  • 0 in reply to Mukul Bhatnagar
    Prodigy 60 points

    Thank you for responding.  I have another question...  Does the USB 3.0 work in the 66AK2H12?

  • 0 in reply to Scott Walker
    TI__Intellectual 1805 points

    Yes, the USB3.0 works in the 66AK2H12, for SS mode, HS mode, FS mode, LS mode. Currently, both uboot code and Linux Kernel code are available for the Host mode of the device.

    Regards!

    Wen