GMAC_PACKET_FILTER_PR
value &= ~GMAC_PACKET_FILTER_PR;
value = GMAC_PACKET_FILTER_PR | GMAC_PACKET_FILTER_RA;
value = GMAC_PACKET_FILTER_PR | GMAC_PACKET_FILTER_PCF;
value |= GMAC_PACKET_FILTER_PR;