MR1_FDE
#define EMAC3_FDX (MR1_FDE | MR1_EIFC | MR1_APP)
sc->sc_mr1 &= ~(MR1_FDE | MR1_ILE | MR1_EIFC | MR1_MF_MASK | MR1_IST);
sc->sc_mr1 |= (MR1_FDE | MR1_EIFC | MR1_IST);