JackOfAll wrote: > Yeah, PCM2704 is definitely adaptive iso, not async. Don't know why, but > I got it in my head that any USB1/UAC1 device will require a hub.
To be specific with the problem I've seen... Async usb on a full speed bus (usb 1/1.1 uac 1) requires two iso connections one outbound for the audio and an inbound one for the feedback path - it turns out that the TT function in the ARC ehci block on most arm socs can't handle this [must be a simplifying cost saving that was made in the logic block]. Adding a hub gets an external TT which fixes it. Without a hub audio is heard, but the feedback doesn't work and so you get occasional dropouts at a rate dependant on what frequency extreme the dac supports. ------------------------------------------------------------------------ Triode's Profile: http://forums.slimdevices.com/member.php?userid=17 View this thread: http://forums.slimdevices.com/showthread.php?t=98544 _______________________________________________ unix mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/unix
