Hi again > Note that isochronous transfers are only implemented in UHCI. OHCI as > well as EHCI don't support them. To clarify: our OHCI and EHCI host controller drivers do not support isochronous transfers because it's not implemented. OHCI and EHCI of course do also describe isochronous transfers. The OHCI implementation should be fairly simple, but in EHCI you have a few more complications, especially when it comes to split transfers for USB 1.1 support. Since there's comparably little hardware that uses isochronous transfers at all it has never really been high priority for me. Regards Michael