EMAC_MACCONTROL
emac_write(EMAC_MACCONTROL, mac_control);
val = emac_read(EMAC_MACCONTROL);
emac_write(EMAC_MACCONTROL, val);
mac_control = emac_read(EMAC_MACCONTROL);
mac_control = emac_read(EMAC_MACCONTROL);
mac_control = emac_read(EMAC_MACCONTROL);
emac_write(EMAC_MACCONTROL, mac_control);