MAC_CMDCFG_TX_ENA
dat &= ~(MAC_CMDCFG_TX_ENA | MAC_CMDCFG_RX_ENA);
cmd &= ~MAC_CMDCFG_TX_ENA;
value |= MAC_CMDCFG_TX_ENA | MAC_CMDCFG_RX_ENA;
value &= ~(MAC_CMDCFG_TX_ENA | MAC_CMDCFG_RX_ENA);