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NetBSD 6.1.5 - man page for ehci (netbsd section 4)

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

     ehci -- USB Enhanced Host Controller driver

     ehci* at cardbus? function ?
     ehci* at pci? dev ? function ?
     usb*  at ehci?

     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)) han-
     dling 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

     cardbus(4), ohci(4), pci(4), uhci(4), usb(4)

     The ehci driver appeared in NetBSD 1.6.

     The support for hubs that are connected with high speed upstream and low or full speed down-
     stream (i.e., for transaction translators) is limited.

BSD					   Aug 10, 2008 				      BSD
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