CS4280_PFIE
pfie = BA1READ4(sc, CS4280_PFIE) & ~PFIE_MASK;
BA1WRITE4(sc, CS4280_PFIE, pfie | PFIE_PI_ENABLE);
mem = BA1READ4(sc, CS4280_PFIE) & ~PFIE_PI_MASK;
BA1WRITE4(sc, CS4280_PFIE, mem);
mem = BA1READ4(sc, CS4280_PFIE);
BA1WRITE4(sc, CS4280_PFIE, (mem & ~PFIE_PI_MASK) | PFIE_PI_DISABLE);
BA1WRITE4(sc, CS4280_PFIE, mem);