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TPS65986 USB 2 data pass through

Graham Haddock
Prodigy 80 points
Other Parts Discussed in Thread: TPS65982, TPS6598X-CONFIG, TUSB8041

I am trying to bring up a TPS65986 in a USB-2 down stream data device with power source capability.

I am having trouble getting the TPS65986 to pass through USB 2.0 data.

It will enumerate its own endpoint and billboard successfully, but not pass through USB to the downstream device.

Turning those off in the configuration tool does not change the problem.

The TPS65982 EVM in configuration 11, Mini-Dock seems closest to what I want, and does pass through USB 2 downstream.

How do I translate from EVM configuration 11 (Mini-Dock) to a set of configuration settings on the "Application Customization Tool" to do the same thing.

Or...

What configuration settings enable the USB 2 data to pass through the TPS65986 ?

  • 0
    TI__Mastermind 30280 points
    Graham,

    There are 3 settings for the USB 2.0 Mux that can be configured (Enabled/Disabled) in the TPS6598X-CONFIG Tool:
    USB_RP (through path)
    USB_EP (Endpoint)
    Billboard Allowed (if USB_EP is disabled, Billboarding can never occur)

    If both USB_RP and USB_EP are enabled, the mux will be enabled dynamically based on whether or not an Alternate Mode is entered.
    Additionally, if DisplayPort Alt Mode is supported by this Downstream device (Upstream Facing Port, or UFP), then there are 2 possible outcomes:
    -If DisplayPort Mode is entered, the USB_RP will be enabled normally
    -If DisplayPort Mode is entered, the USB_EP will be enabled and the USB2.0 connection will terminate at the TPS65986.

    On the Mini-Dock, the USB2.0 signal goes directly into the TUSB8041 USB Hub from the Type-C connector, and the TPS65986 is a downstream connection, so that the USB_EP cannot interfere with other downstream products.
  • 0 in reply to Brian Berner
    Prodigy 80 points

    Brian:

    Thanks for the explanation.

    I found a combination that got it working, and it is totally consistent with your explanation.

    Thank you,

    --- Graham