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EHCI(4) FreeBSD Kernel Interfaces Manual EHCI(4) NAME ehci -- USB Enhanced Host Controller Interface SYNOPSIS ehci* at cardbus? ehci* at fdt? ehci* at pci? usb* at ehci? DESCRIPTION The ehci driver provides support for the USB Enhanced Host Controller In- terface, 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) HISTORY The ehci driver has been available since OpenBSD 3.6. FreeBSD 13.0 January 5, 2019 FreeBSD 13.0
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY
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