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

NAME
     ehci -- USB Enhanced Host Controller Interface

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

DESCRIPTION
     The ehci driver provides support for the USB Enhanced Host	Controller In-
     terface, 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 con-
     trollers (i.e., ohci(4) or	uhci(4)) or an internal	rate-matching hub to
     handle USB	1.x devices.

     If	at least one companion controller is present, 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)

HISTORY
     The ehci driver has been available	since OpenBSD 3.6.

FreeBSD	13.0			January	5, 2019			  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY

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<https://www.freebsd.org/cgi/man.cgi?query=ehci&sektion=4&manpath=OpenBSD+6.9>

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