nand nor flash

nand
可以整页写，
也可以在上半页操作或着下半页操作。
http://www.51hei.com/bbs/dpj-128533-1.html
https://wenku.baidu.com/view/ae4dfbc00c22590102029d55.html

https://www.cnblogs.com/yeshenmeng/p/9507223.html

http://blog.chinaunix.net/uid-12555930-id-2929676.html

http://www.360doc.com/content/14/0319/09/9408846_361781720.shtml(图好)