PPIF_DELAY
sc->sc_flags &= ~PPIF_DELAY;
sc->sc_flags |= PPIF_DELAY;
if (sc->sc_flags & PPIF_DELAY) {
sc->sc_flags &= ~PPIF_DELAY;
sc->sc_flags &= ~PPIF_DELAY;
sc->sc_flags |= PPIF_DELAY;
if (sc->sc_flags & PPIF_DELAY) {
sc->sc_flags &= ~PPIF_DELAY;