LE_T1_ENP
tmd->tmd1_bits = LE_T1_STP | LE_T1_ENP;
tmd.tmd1_bits = LE_T1_OWN | LE_T1_STP | LE_T1_ENP;
tmd.tmd1 = LE_T1_OWN | LE_T1_STP | LE_T1_ENP | LE_T1_ONES |
sc->sc_txdescs[lasttx].tmd1 |= htole32(LE_T1_ENP);