GMAC_MAC_CONF_PS
conf &= ~(GMAC_MAC_CONF_PS | GMAC_MAC_CONF_FES);
conf |= GMAC_MAC_CONF_PS | GMAC_MAC_CONF_FES;
conf |= GMAC_MAC_CONF_PS;
conf &= ~(GMAC_MAC_CONF_PS | GMAC_MAC_CONF_FES);
conf |= GMAC_MAC_CONF_PS | GMAC_MAC_CONF_FES;
conf |= GMAC_MAC_CONF_PS;