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Operating techniques for reducing effects of coupling between storage elements of a non-volatile memory operated in multiple data states
Operating techniques for reducing effects of coupling between storage elements of a non-volatile memory operated in multiple data states
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机译:用于减少在多个数据状态下操作的非易失性存储器的存储元件之间耦合的影响的操作技术
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摘要
A non-volatile memory system having an array of memory cells with at least one storage element each is operated with a plurality of storage level ranges per storage element. A flash electrically erasable and programmable read only memory (EEPROM) is an example, wherein the storage elements are electrically floating gates. The memory is operated to minimize the effect of charge coupled between adjacent floating gates, by programming some cells a second time after adjacent cells have been programmed. The second programming step also compacts a distribution of charge levels within at least some of the programming states. This increases the separation between states and/or allows more states to be included within a given storage window. An implementation that is described is for a NAND type of flash EEPROM.
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