Ampro Corporation COM 830 - Manual (Page 30)

Chapter 2 Specifications
24 Reference Manual COM 830
USB 2.0 EHCI Host Controller Support
The 8 USB ports are shared between an EHCI host controller and the 4 UHCI host controllers.
Within the EHC functionality there is a port-routing logic that executes the mixing between the two different
types of host controllers (EHCI and UHCI). This means that when a USB device is connected the routing
logic determines who owns the port. If the device is not USB 2.0 compliant, or if the software drivers for
EHCI support are not installed, then the UHCI controller owns the ports.
Routing Diagram: