TULIP_CMD_RXRUN
sc->tulip_cmdmode &= ~(TULIP_CMD_FULLDUPLEX|TULIP_CMD_RXRUN);
sc->tulip_cmdmode &= ~TULIP_CMD_RXRUN;
sc->tulip_cmdmode |= TULIP_CMD_RXRUN;
sc->tulip_cmdmode &= ~TULIP_CMD_RXRUN;
sc->tulip_cmdmode |= TULIP_CMD_RXRUN;
TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode & ~TULIP_CMD_RXRUN);
sc->tulip_cmdmode &= ~(TULIP_CMD_RXRUN|TULIP_CMD_FULLDUPLEX);