SACOM_DR
bus_space_write_4(iot, ioh, SACOM_DR, c);
bus_space_read_4(iot, ioh, SACOM_DR);
put[0] = bus_space_read_4(iot, ioh, SACOM_DR);
c = bus_space_read_4(sacomconstag, sacomconsioh, SACOM_DR);
bus_space_write_4(sacomconstag, sacomconsioh, SACOM_DR, c);
c = bus_space_read_4(sacomconstag, sacomconsioh, SACOM_DR);
bus_space_read_4(iot, ioh, SACOM_DR);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_DR, data[i++]);
rx_data = bus_space_read_4(sc->sc_iot, sc->sc_ioh, SACOM_DR);