ATW_INTR_TLT
sc->sc_inten |= ATW_INTR_TPS | ATW_INTR_TLT | ATW_INTR_TRT |
sc->sc_txint_mask = ATW_INTR_TCI | ATW_INTR_TUF | ATW_INTR_TLT |
PRINTINTR(ATW_INTR_TLT);
if (txstatus & ATW_INTR_TLT)