Method and apparatus for searching for data in multi-bit flash EEPROM memory arrays

摘要

An arrangement which provides for searching for a data pattern in a flash EEPROM memory array using the internal controllers of the individual chips of the array. By utilizing these controllers to conduct the search, an external database is not required to store all of the logical addresses and their associated physical positions. The addition of more memory to the array need not increase the time required for the search because each addition of a chip to the array to add more memory adds another controller as well as more memory. In fact, the time for conducting the search may be reduced since searches may be conducted in parallel on the individual chips. The direct on-chip search of the array requires a much smaller general data base which is used essentially for control information and frees area on the flash EEPROM memory array board for memory devices.