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EHCI(4)			  OpenBSD Programmer's Manual		       EHCI(4)

NAME
     ehci - USB Enhanced Host Controller Interface

SYNOPSIS
     ehci* at cardbus?
     ehci* at pci?
     usb*  at ehci?

DESCRIPTION
     The ehci driver provides support for the USB Enhanced Host Controller
     Interface, which provides an interface to usb(4) devices.

     EHCI controllers are peculiar in that they can only handle the USB 2.0
     protocol.	This means that they normally have one or more companion
     controllers (i.e., ohci(4) or uhci(4)) handling USB 1.x devices.
     Consequently each USB connector is electrically connected to two USB
     controllers.  The handling of this is totally automatic, but can be
     noticed since USB 1.x and USB 2.0 devices plugged in to the same
     connector appear to connect to different USB buses.

SEE ALSO
     cardbus(4), ohci(4), pci(4), uhci(4), usb(4)

OpenBSD 4.9			 June 26, 2008			   OpenBSD 4.9

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