nand flash和nor flash的区别？？

nand flash和nor flash的区别？？

1)nand是以页面形式访问（1页为256或512B字节）顺序访问，而nor是线性访问！随机访问

2)nor 写入和 擦除速度较慢，读取速度块！nand其块擦除时间是2ms，nor的块擦除是200ms。

3）nand不能执行代码?nor可以执行代码

  NOR NAND  
Interface Bus   I/O  
Cell Size Large   Small  
Cell Cost  High Low  
Read Time  Fast Slow  
Program Time single Byte Fast   Slow  
Program Time multi Byte Slow Fast  
Erase Time Slow Fast  
Power consumption High Low, but requires additional RAM  
Can execute code Yes   No, but newer chips can execute a small
loader out of the first page

Bit twiddling nearly unrestricted  1-3 times, also known as "partial page program restriction"
Bad blocks at ship time  No Allowed

不好意思，排版有问题，其实，此问题老早有人问过了，楼主搜索一下应该有更多的答案！