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Command: ehci | Section: 4 | Source: NetBSD | File: ehci.4
EHCI(4) FreeBSD Kernel Interfaces Manual EHCI(4)
NAME
ehci - USB Enhanced Host Controller driver
SYNOPSIS
ehci* at cardbus? function ?
ehci* at pci? dev ? function ?
usb* at 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
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 busses.
SEE ALSO
cardbus(4), ohci(4), pci(4), uhci(4), usb(4)
HISTORY
The ehci driver appeared in NetBSD 1.6.
BUGS
The support for hubs that are connected with high speed upstream and low
or full speed downstream (i.e., for transaction translators) is limited.
FreeBSD 14.1-RELEASE-p8 August 10, 2008 FreeBSD 14.1-RELEASE-p8