Along with the development of semiconductor fabrication technology, the area of the memory cell in flash memory chip is reduced, the integration is improved, then the flash memory can meet the demand of the market for large density. 随着半导体制造工艺技术的不断进步,快闪存储器芯片内存储单元的制造尺寸大幅缩小,集成度显著提高,有效满足了市场对大容量存储器芯片的需求。