Beside the different silicon cell design, the most important difference between NAND and NOR Flash is the bus interface. NOR Flash is connected to a address / data bus direct like other memory devices as SRAM etc. NAND Flash uses a multiplexed I/O Interface with some additional control pins. NAND flash is a sequential access device appropriate for mass storage applications, while NOR flash is a random access device appropriate for code storage application. NOR Flash can be used for code storage and code execution. Code stored on NAND Flash can't be executed from there. It must be loaded into RAM memory and executed from there.
NOR可以直接和CPU相连，就好像内存一样。NAND不可以，因为NAND还需要别的一些I/O控制接口。所以NAND更像磁盘，而NOR更像内存 NOR比NAND贵，并且，NAND支持顺序读取，而NOR支持随机读取。 所以，NOR中可存储代码，这样CPU直接读取就在其中运行。NAND不可以（主要还是因为CPU取地址的时候不能直接找到NAND）Linux Kernel系列 相关阅读：?Where=Nkey&Keyword=Linux+Kernel%e7%b3%bb%e5%88%97