MAC_EVENT
tw32(MAC_EVENT, 0);
tw32_f(MAC_EVENT, 0);
tw32_f(MAC_EVENT, MAC_EVENT_LNKSTATE_CHANGED);
tw32_f(MAC_EVENT, MAC_EVENT_LNKSTATE_CHANGED);
tw32_f(MAC_EVENT, MAC_EVENT_LNKSTATE_CHANGED);
tw32_f(MAC_EVENT, MAC_EVENT_LNKSTATE_CHANGED);