Congatec COM Express conga-B915 Guida Utente Scaricare il pdf (Pagina 36)

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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Congatec COM Express conga-B915 Guida Utente Pagina 36