URIO_T_RD
[URIO_T_RD] = {
struct usb_xfer *xfer_other = sc->sc_xfer[URIO_T_RD];
usbd_transfer_start(sc->sc_xfer[URIO_T_RD]);
usbd_transfer_stop(sc->sc_xfer[URIO_T_RD]);
usbd_xfer_max_len(sc->sc_xfer[URIO_T_RD]),