On Tue, 10 Oct 2006 16:02:54 -0400 (EDT), Alan Stern <[EMAIL PROTECTED]> wrote: > On Tue, 10 Oct 2006, Christopher "Monty" Montgomery wrote:
> > Ah, EHCI (or USB in general) specifies a completion interrupt happens > > only at the end of a frame? I was suggesting the interrupt be thrown > > as soon as the URB completes, even if that's mid-frame. > Both UHCI and OHCI issue IRQs only at frame boundaries. I believe EHCI > can issue IRQs at arbitrary uframe boundaries, but I'd have to check the > spec. However I think ehci-hcd generally sets up the controller to issue > IRQs only at frame boundaries. Dave knows more about that. Is this the case for all kinds of transfers? I thought this was only true for Interrupt and ISO, because my testing showed OHCI issuing interrupts for end of bulk transfers at any time. I saw it in usbmon traces when my host system allowed sub-jiffy resolution of a timestamp. But perhaps I'm just delusional or do not remember correctly. -- Pete ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel