ERASING METHOD OF FLASH MEMORY

摘要

PURPOSE: An erasing method of a flash memory is provided to decrease an erasing time by preventing an erasing operation at an erased cell. CONSTITUTION: When an erase command is inputted(S310), a verification operation is performed in order to decide whether a cell has been erased or not(S320). After the verification, it is decided whether there is a failure at a pertinent address or not(S330). If there is no fail, data has been erased at the pertinent address. After this, it is decided whether the pertinent address is the final address or not(S340). If the pertinent address is the final address, the cell including the pertinent address has been already erased, and an erase operation is not performed(S350).