On Tue, 7 Jun 2005, Lothar Wassmann wrote:
> Hi, > > > SOF interrupt is needed for periodic transfers, while for > > control and bulk transfers it is not. So, enumeration itself > > > This is true for ISP116x. But the ISP1362 has a smarter handling for > periodic transfers than the ISP116x. PTDs in the INTL buffer will > automatically be rescheduled without CPU intervention (as long as they > are NAKed by the device). Thus the SOF interrupt is not necessary for > INT transfers. Yes, that is about INT transfer completion. But not using SOF you just ignore the intervals for the INT endpoints, as requested by urb->interval. If the device's INT endpoint happens to be able to respond with data within say 1 ms, then the transfers/urb dequeuing/resubmission/urb enqueuing occur also every ms regardless that the transfer interval requested by the device driver was perhaps order(s) of magnitude larger. Right? Olav ------------------------------------------------------- This SF.Net email is sponsored by: NEC IT Guy Games. How far can you shotput a projector? How fast can you ride your desk chair down the office luge track? If you want to score the big prize, get to know the little guy. Play to win an NEC 61" plasma display: http://www.necitguy.com/?r=20 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
