AE_TXS_COUNT_DEFAULT
NULL, NULL, AE_TXS_COUNT_DEFAULT * 4, 1,
AE_TXS_COUNT_DEFAULT * 4, 0, NULL, NULL,
AE_TXS_COUNT_DEFAULT * 4, ae_dmamap_cb, &busaddr, BUS_DMA_NOWAIT);
sc->txs_cur = (sc->txs_cur + 1) % AE_TXS_COUNT_DEFAULT;
sc->txs_ack = (sc->txs_ack + 1) % AE_TXS_COUNT_DEFAULT;
bzero(sc->txs_base, AE_TXS_COUNT_DEFAULT * 4);
AE_WRITE_2(sc, AE_TXS_COUNT_REG, AE_TXS_COUNT_DEFAULT);