A320 FLC EXCEEDS THE ACFT MAX SPD (VMO) DURING DSCNT AND MISSES THE ASSIGNED XING RESTR.

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WE WERE INBOUND TO ORD ON THE BRD3. IRK TRANSITION STAR. CAPT WAS PF. FLT TIME FOR LEG WAS 1 HR 45 MINS ABOUT 1 HR PRIOR TO ARR; WE PLANNED TO CALL FOR THE FLT PAPERS FOR OUR NEXT LEG; AFTER RECEIPT OF NEW ORD ATIS; AS CALLING FOR FLT PAPERS TIES UP COMMERCIAL RADIO. THE NEW ATIS CAME OUT ABOUT 10 MINS LATE AT 10 MINS PAST THE HR. SHORTLY THEREAFTER; WE CALLED FOR FLT PAPERS AND OUR PURSER BROUGHT US OUR BREAKFAST MEALS. WE HAD BEEN OFF THE GATE ABOUT 1 HR 20 MINS AND AIRBORNE 1 HR. OUR FLT PAPERS WERE DELIVERED PIECEMEAL AND SLOWER THAN NORMAL. THE RESULT WAS; I WAS EATING; FLT PLANNING; RUNNING THE RADIO; PLANNING OUR ARR AND MONITORING THE CAPT'S FLYING SIMULTANEOUSLY. WHILE MORE THAN 200 NM FROM ORD; WE WERE GIVEN A CLRNC TO CROSS KEOKK INTXN AT FL330. CAPT ACKNOWLEDGED THE CLRNC AND PROGRAMMED THE FMGC FOR IT. CAPT THEREAFTER MISSED BEGINNING THE DSCNT AT THE FMGC CALCULATED TOP-OF-DSCNT POINT BY LESS THAN 10 NM. THE CAPT FIRST PUSHED THE FCU ALT KNOB WISHING TO ENGAGE A VNAV DSCNT. HOWEVER; AIRBUS LOGIC PRESUMES A CRUISE DSCNT AT 1000 FPM FOR DSCNTS BEGUN MORE THAN 200 NM FROM THE DEST. BY THE TIME THE CAPT REALIZED THAT THE AUTOPLT WAS NOT DSNDING FAST ENOUGH IT WAS TOO LATE. CAPT DISENGAGED THE AUTOPLT AND AUTOTHRUST AND EMPLOYED FULL SPD BRAKES; BUT CROSSED KEOKK STILL ABOUT 800 FT HIGH. WE WERE GIVEN AN ATC FREQ CHANGE JUST PRIOR TO KEOKK; AND NEITHER CTLR MENTIONED OUR DEV OR ANY LOSS OF SEPARATION. LEVEL AT FL330; CAPT RE-ENGAGED AUTOPLT 1 AND MOVED THE TRUST LEVERS TO THE CLB DETENT; INTENDING TO RE-ENGAGE AUTOTHRUST. HOWEVER; UNBEKNOWNST TO US; HE FAILED TO PUSH THE AUTOTHRUST BUTTON ON THE FCU (THE SECOND STEP IN ENGAGING THE AUTOTHRUST SYS). BECAUSE OF THIS; HE HAD IN REALITY MANUALLY SET CLB THRUST; WHICH HAD NO ADVERSE AFFECT FOR OUR SHORT SEGMENT AT FL330. SOON FOLLOWED CLRNC TO FL290. CAPT COMMANDED A VERT SPD DSCNT OF 1000 FPM. HOWEVER; BECAUSE THE AUTOTHRUST WAS NOT ENGAGED; THE THRUST DID NOT RETARD. THE COMBINATION OF 1000 FPM DSCNT AND CLB THRUST CAUSED A MOMENTARY OVERSPD OF 2-5 KTS. CAPT REDUCED THRUST MANUALLY AND DECREASED THE DSCNT RATE TO PREVENT MORE OVERSPD. THIS OVERSPD COULD HAVE BEEN EASILY PREVENTED HAD EITHER OF US READ THE FMA'S INDICATED ON OUR PRIMARY FLT DISPLAYS AS WE HAVE BEEN TRAINED TO DO OVER AND OVER AGAIN THROUGHOUT OUR CAREERS AS 'GLASS' ACFT PLTS. CAUSES; EITHER WHOLLY OR PARTLY: 1) TRYING TO DO TOO MANY THINGS AT ONE TIME. 2) FATIGUE: SHORT LAYOVER COUPLED WITH XA30 O'CLOCK IN THE MORNING WAKE-UP AND A CHALLENGING/DEMANDING DEP OUT OF DEN WITH DEICING AND WINTER OPS. 3) LOW BLOOD SUGAR: 14 HRS SINCE MY LAST MEAL. 4) OVERCONFIDENCE ON MY PART REGARDING THIS CAPT'S FALLIBILITY; AS THIS WAS OUR 26TH LEG TOGETHER THIS MONTH THROUGHOUT WHICH HE SHOWED SUPERIOR AIRMANSHIP. AND 5) LATE FOOD; LATE ATIS; SLOW AND PIECEMEAL FLT PAPER DELIVERY.