Sudden enlightenment & knowledge of the Abhidhamma

In the Mahayana tradition, there is the notion of sudden enlightenment. I am not asking whether sudden enlightenment is possible or not. I would like to know if Mahayanists see acquisition of knowledge of the abhidhamma as part of or as a side effect of sudden enlightenment, or if sudden enlightenment is considered a lighter version of fully fledged englightenment?