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US. Patent Jun. 24, 1997 5,642,481 Sheet 2 of 3 REREAD A SET OF TUPLES OF THE CARD VIA THE MEMORY WINDOW DETECT A VALIDATION EVENT 1 CALCULATE A SUBSEQUENT CYCLIC I REDUNDANCY CHECK VALUE BASED ON THE READ TUPLES RETRIEVE A MEMORY WINDOW 66\_> L 54 56 ARETHE CYCLIC REDUNDANCY A'I'I‘ENIPT TO VERIFY THE TUPLE FORMAT BY WALKING THROUGH THE TUPLES VIA THE MEMORY WINDOW. ARE THE TUPLES VALID NO CHECK VALUES CONSISI‘ENT? NO ‘) YES ( 60 70 HAVE 8 ITERATIONS BEEN READASET OFTUPLES OFTHECARD VIA THE MEMORY WINDOW CALCULATE A CYCLIC REDUNDANCY CHECK VALUE BASED ON THE READ TUPLES COIVIPLETED? "7 ALLOCATE THE MEMORY WINDOW 1 READ THE SET OF TUPLES OF THE CARD VIA THE ALIDCATED MEMORY WINDOW 62 so? NJ UNALLOCATE THE ALLOCATED MEMORY WINDOW DETERMINE AN ALLOCATED CYCLIC REDUNDANCY CHECK VALUE BASED ON THE READ TUPLES ‘L____ 76) 78 F%_2 ARE THE CYCLIC REDUNDANCY CHECK VALUES CONSISTENT? NO
