FMQM_PNC
reg = bus_read_4(sc->sc_mem, FMQM_PNC);
bus_write_4(sc->sc_mem, FMQM_PNC, reg & ~PNC_EN);
reg = bus_read_4(sc->sc_mem, FMQM_PNC);
bus_write_4(sc->sc_mem, FMQM_PNC, reg | PNC_EN | PNC_STEN);
bus_write_4(sc->sc_mem, FMQM_PNC, reg | PNC_EN | PNC_STEN);