My understanding is that each USB 3.0 port consumes a USB 2.0 port. I thus don't think that you can separate the two if using USB 3.0. I can think of two possibilities:
- Disable the xHCI controller and use all ports as USB 2.0 ports.
- Use an add-in (PCIe) card providing a separate USB controller and use its ports for the medical device.
Hope this helps,
Thanks Scott for your answer. I hoped there would be a way to say: if a certain USB port is used it will go through the xHCI controller and let us say also through the EHCI No 1 as a help controller, in case a USB 3.0 communication is required. But if another USB port is used, it will directly go to the EHCI No 2. So, the medical device would be connected to the second USB port.
I think we have to disable the xHCI controller, in order to have two separate controllers, as you have suggested. The second option with add-in(PCIe) is not possible, as the two available PCIe slots are already occupied.
yes if we disable xHCI in bios, then we have two EHCI USB contollers available. Also it seems that USB connection to our medical device is more reliable, as only that device connected to the one EHCI controller. Other devices are connected to the second EHCI controller. But as meantioned, in that case we don't have an USB 3.0 support at all (for other devices). Some customers would like to have USB 3.0 support too, as they need to copy some data to or from USB stick....