ehci - USB Enhanced Host Controller driver
ehci* at pci? dev ? function ?
usb* at ehci?
The ehci driver provides support for the USB Enhanced Host
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
(i.e., ohci(4) or uhci(4)) handling USB 1.x devices. Consequently
each USB connector is electrically connected to two
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
to connect to different USB busses.
cardbus(4), ohci(4), pci(4), uhci(4), usb(4)
The driver is not finished and is quite buggy.
There is no support (yet) for hubs that are connected with
high speed upstream
and low or full speed downstream (i.e., for transaction translators).
There is no support (yet) for interrupt or isochronous
OpenBSD 3.6 November 5, 2001
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