EHCI(4) OpenBSD Programmer's Manual EHCI(4)NAMEehci - 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 ALSOcardbus(4), ohci(4), pci(4), uhci(4), usb(4)OpenBSD 4.9 June 26, 2008 OpenBSD 4.9