AWI_TXD_STATE
flags = awi_read_1(sc, sc->sc_txdone + AWI_TXD_STATE);
awi_write_1(sc, sc->sc_txbase + AWI_TXD_STATE, 0);
awi_write_1(sc, ntxd + AWI_TXD_STATE, 0);
awi_write_1(sc, txd + AWI_TXD_STATE, AWI_TXD_ST_OWN);