FCRTL_XONE
CSR_WRITE(sc, DGE_FCRTL, FCRTL | FCRTL_XONE);
sc->sc_fcrtl &= ~FCRTL_XONE;
sc->sc_fcrtl |= FCRTL_XONE;
sc->sc_fcrtl &= ~FCRTL_XONE;
sc->sc_fcrtl |= FCRTL_XONE;
sc->sc_fcrtl &= ~FCRTL_XONE;
sc->sc_fcrtl |= FCRTL_XONE;