MACCR_RXFC_ENABLE
maccr |= (ax_local->flowctrl & AX_FC_RX) ? MACCR_RXFC_ENABLE : 0;
~(MACCR_TXFC_ENABLE | MACCR_RXFC_ENABLE);
maccr |= ax_local->pause ? MACCR_RXFC_ENABLE : 0;
maccr |= (ax_local->flowctrl & AX_FC_RX) ? MACCR_RXFC_ENABLE : 0;
MACCR_TXFC_ENABLE | MACCR_RXFC_ENABLE);