> -----Original Message----- > From: Alex Zeffertt [mailto:ajz at cambridgebroadband.com] > Sent: Thursday, September 07, 2006 6:59 PM > To: Li Yang-r58472 > Cc: n.balaji at gdatech.co.in; linuxppc-embedded at ozlabs.org > Subject: Re: MPC8360E USB Host Controller Driver > > >> manual, they told that this controller does not belong to UHCI or > >> OHCI standard. > > > > Yes, you can call it FHCI if you like. :) > > I heard that on the PQII (82xx) devices the FHCI required > intervention from the core, even when there was zero traffic > on the USB. I think this was because the core had to > continuously service a 1ms interrupt. This generates > significant extra loading, making it worth considering using > a cheap EHCI chip instead....
There are improvements on future chips with a QE. However it is still full-speed and need CPU intervention. But keep in mind that USB is not a key feature for netcomm devices which PQ is targeting. > > Does anyone know if this is still the case with the PQII Pro (83xx)? 834x has a integrated EHCI controller instead. - Leo