EMAC_TX_CTL_0
{ "TX_CTL_0", EMAC_TX_CTL_0 },
val = RD4(sc, EMAC_TX_CTL_0);
WR4(sc, EMAC_TX_CTL_0, val | TX_EN);
val = RD4(sc, EMAC_TX_CTL_0);
WR4(sc, EMAC_TX_CTL_0, val & ~TX_EN);