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Command: ehci | Section: 4 | Source: OpenBSD | File: ehci.4
EHCI(4) FreeBSD Kernel Interfaces Manual EHCI(4)
NAME
ehci - USB Enhanced Host Controller Interface
SYNOPSIS
ehci* at acpi?
ehci* at cardbus?
ehci* at fdt?
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)) 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
acpi(4), cardbus(4), ohci(4), pci(4), uhci(4), usb(4)
HISTORY
The ehci driver has been available since OpenBSD 3.6.
FreeBSD 14.1-RELEASE-p8 December 29, 2021 FreeBSD 14.1-RELEASE-p8