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EHCI(4)		       FreeBSD Kernel Interfaces Manual		       EHCI(4)

NAME
     ehci -- USB Enhanced Host Controller driver

SYNOPSIS
     device ehci

DESCRIPTION
     The ehci driver provides support for the USB Enhanced Host	Controller
     Interface,	which is used by USB 2.0 controllers.

     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 con-
     trollers (i.e., ohci(4) or	uhci(4)) handling USB 1.x devices.  Conse-
     quently each USB connector	is electrically	connected to two USB con-
     trollers.	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 busses.

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

HISTORY
     The ehci device driver first appeared in FreeBSD 5.1.

BUGS
     The driver	is not finished	and is quite buggy.

     There is currently	no support for isochronous transfers.

FreeBSD	9.3			March 20, 2005			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | BUGS

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