unixdev.net


Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (OpenBSD-5.7)
Page:
Section:
Apropos / Subsearch:
optional field

EHCI(4)                  BSD Kernel Interfaces Manual                  EHCI(4)

NAME
     ehci -- 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 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)

BSD                             March 30, 2017                             BSD