Congatec COM Express conga-B915 Guide de l'utilisateur Page 36

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Copyright © 2008 congatec AG B915m10 36/92
USB 2.0 EHCI Host Controller Support6.6
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
UHCI #3
(D29:F3)
UHCI #0
(D29:F0)
UHCI #1
(D29:F1)
UHCI #2
(D29:F2)
Enhanced Host Controller Logic
Debug
Port
Port 7
Port 3
Port 4
Port 5
Port 6
Port 2
Port 1
Port 0
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