What was found
(CAN) 1. AT CRUISE, ECAM CONTROLLER SHOWED SIGNS OF BEING ERRATIC, FLASHING THEN TURNED BLACK. SMOKE STARTED FOR 10 SECONDS WITH ELECTRICAL SMELL. CB POPPED AND SMOKE STOPPED. NOT ENOUGH SMOKE TO DON O2 MASKS. 2. PHONE PATCH MADE TO DISPATCH REGARDING PROBLEM. AIRCRAFT CONTINUED WITH FLIGHT WHILE MONITORING SITUATION. 3. ON ARRIVAL, #1 ECAM CONTROLLER REPLACED AND CHECKED SERVICEABLE IAW MM 31-51-00. 4. NO FURTHER PROBLEM DURING SUBSEQUENT FLIGHT.