AN A320 CREW; WHILE ON APCH TO PDX; EXCEEDED ASSIGNED AIRSPD.

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FLAP OVERSPD EVENT DURING DSCNT. OVER THE PAPER MILL ON AUTOFLT (AUTOPLT 1/AUTOTHROTTLE); WE HAD FLAPS 2 DEGS SELECTED; AND ASSIGNED SPD OF 180 KTS. WE HAD FORGOTTEN TO ACTIVATE AND CONFIRM APCH PHASE IN MCDU. ACFT WENT TO 203 KTS FOR 4 SECONDS WITH EMER WARNING BELL AND LIGHTS AND ECAM. AUTOPLT WAS DISCONNECTED; CAPT FLYING. PITCHED UP TO RELIEVE SPD ERROR. EVENT OCCURRED AS WE WERE TURNING OVER THE PAPER MILL TO A HDG OF 240 DEGS. WE REALIZED THE ERROR AND IMMEDIATELY ACTIVATED AND CONFIRMED MCDU. THE REST OF THE FLT WAS UNEVENTFUL AND SMOOTH LNDG. BOTH PLTS WERE FATIGUED AND ERROR PRONE DUE TO FLT DURING WINDOW OF CIRCADIAN LOW (WOCL). CAPT'S BODY TIME WAS XA30 AND COPLT'S WAS XB30. SIT TIME IN SAN FRANCISCO WAS 1 HR 30 MINS; WHICH ADDED TO OUR FATIGUE. WE HAD GONE TO MANAGED SPD BEFORE ACTIVATING AND CONFIRMING WHICH WAS DUE TO ALERTNESS DETERIORATION AND EXCESSIVE FOCUS ON OVERALL SAFETY OF FLT. WE ATTEMPTED TO USE AUTOMATION AS A SAFETY MEASURE AND ULTIMATELY HAD TO RELY ON GOOD OLD STICK AND RUDDER FLYING SKILLS TO DO THE JOB. A MAINT WRITE-UP WAS PLACED IN THE LOGBOOK AND WE DEBRIEFED THE WAYS WE COULD PREVENT THIS FROM OCCURRING IN THE FUTURE.