dc_mii_writebit
void dc_mii_writebit(struct dc_softc *, int);
dc_mii_writebit(sc, 1);
dc_mii_writebit(sc, bits & i);
dc_mii_writebit(sc, 1);
dc_mii_writebit(sc, 0);
dc_mii_writebit(sc, 0);
dc_mii_writebit(sc, 0);
dc_mii_writebit(sc, 0);
dc_mii_writebit(sc, 0);