RCTRL_TUCSEN
~(RCTRL_IPCSEN | RCTRL_TUCSEN | RCTRL_VLEX | RCTRL_PRSDEP);
sc->sc_rctrl |= RCTRL_TUCSEN;
& (RCTRL_IPCSEN | RCTRL_TUCSEN | RCTRL_VLEX | RCTRL_PRSDEP))
__SHIFTOUT(sc->sc_rctrl, RCTRL_TUCSEN),