USB_R1_REG
val = USBCTRLGLUE_READ_REG(sc, USB_R1_REG);
USBCTRLGLUE_WRITE_REG(sc, USB_R1_REG, val);
val = USBCTRLGLUE_READ_REG(sc, USB_R1_REG);
USBCTRLGLUE_WRITE_REG(sc, USB_R1_REG, val);
val = USBCTRLGLUE_READ_REG(sc, USB_R1_REG);
USBCTRLGLUE_WRITE_REG(sc, USB_R1_REG, val);