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If I plug in a USB 2.0 Storage Device into one of the 3.0 ports of my Windows 10 desktop, its descriptor says that it is plugged in to Hub: 1 Port: 1
Every 2.0 device plugged into this same port will always get this same hub and port number.
However, plugging in a USB 3.0 device, the port numbers are always bigger than 10. So, a USB 3.0 device plugged into the same port will get Hub: 1 Port: 16
. This behavior is consistent through all of the USB 3.0 devices I've plugged in.
Why is there a difference in the port number designation of USB 2.0 and 3.0 devices? There is no difference when 2.0 and 3.0's are plugged into a USB 2.0 port.
One reason I thought of was that different controller settings / circuits are used in order to enable 3.0 functionality, and therefore a different port is assigned.
Actually, if your connected device is a hub, then both EHCI and xHCI paths are connected simultaneously. – Ale..chenski – 2019-01-18T18:16:16.330