7 Replies Latest reply on May 30, 2018 10:24 AM by Intel Corporation

    Intel 8 Series/C220 Series Chipset - Using USB 2.0 (EHCI ) and 3.0 (xHCI ) controllers in parallel




      in our Dell Optiplex X"2 PCs we have the "Intel 8 Series/C220 Series Chipset", which has according to data-sheet:

      1. 1. Two USB 2.0 controllers, more exactelly: USB EHCI Host Controllers (D29:F0 and D26:F0)
      2. 2. and one USB 3.0 Controller: xHCI Controller (D20:F0)


      We uses the PC in a high sensible area "medical devices", where we require to have a stable USB connection to one USB device (medical device). A stable connection to other devices like USB-Flash or Printer is not required. So the original decision was to use one USB 2.0 controller just for the medical device and connect other devices (USB-Flash etc) to the other controller. On that way we would have one dedicated USB Controller for the medical device.

      Now we have noticed that, when USB 3.0 support is activated, the two USB 2.0 Controllers (EHCI) seems not be used. Everything is connected over the USB 3.0 (xHCI Controller). Verified under windows device manager (Parent of an USB device)

      As operation system we have Windows 10 and uses the Intel Chipset driver provided by dell (Version: ,A00)

      Question: Is there a way to use USB 2.0 Controller and USB 3.0 Controller in parallel. Or do we need (specified by chipset) to deactivate USB 3.0 support, to have two USB 2.0 controllers being working?