CMD_RX_ENABLE
WR1(sc, PSC_CR, CMD_TX_ENABLE | CMD_RX_ENABLE);
PSC_WRITE_1(sc, PSC_CR, CMD_TX_ENABLE | CMD_RX_ENABLE);
bus_space_write_1(iot, ioh, PSC_CR, CMD_TX_ENABLE | CMD_RX_ENABLE);