LSB PAGE RECOVERING METHOD AT A MULTI-LEVEL CELL FLASH MEMORY DEVICE, CAPABLE OF EASILY RESTORING A LSB PAGE IN THE INACTIVE STATE OF AN ELECTRIC POWER SUPPLY

摘要

PURPOSE: An LSB(Least Significant Bit) page recovering method is provided to easily restore a LSB page in case that an electric power supply is shut down in the process of a program for a MSB(Most Significant Bit) page.;CONSTITUTION: A first LSB page group or an n-th LSB page group which include at least two LSB pages are set. A first LSB page or an x-th LSB page which are included in an i-th LSB page group are programmed. An i-th LSB parity page for the first LSB page or the x-th LSB page is generated. A first MSB page or an x-th MSB page corresponding to one LSB page is programmed. A j-th LSB page which pairs with a j-th MSB page is restored by using the i-th LSB parity page in the inactive state of the power supply.;COPYRIGHT KIPO 2010