ehci
—
USB Enhanced Host Controller Interface
ehci* at cardbus?
ehci* at pci?
usb* at ehci?
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)) 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 buses.
cardbus(4),
ohci(4),
pci(4),
uhci(4),
usb(4)