PORT_RX_ENABLE
data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE | PORT_LEARN_DISABLE);
data |= (PORT_RX_ENABLE | PORT_LEARN_DISABLE);
data |= PORT_RX_ENABLE;
data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);
data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE);
data |= PORT_RX_ENABLE;
data |= PORT_RX_ENABLE;
data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);
data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE);
data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);