With the scaling down of the feature size of flash device and the application in embedded systems and portable equip-ments, lower operating voltage and higher programming/ erasing speed are required. 随着嵌入式系统和移动设备的发展以及集成电路特征尺寸的进一步缩小,在现有基础上对嵌入式存储器又提出了新的要求,主要有两条:更低的工作电压和更快的擦写速度。