https://blog.wongcw.com/2020/06/05/%e5%9c%8b%e7%94%a250nm-nor%e9%96%83%e5%ad%98%e9%87%8f%e7%94%a2%ef%bc%9a%e6%9c%80%e5%a4%a7256mb%e5%ae%b9%e9%87%8f%e3%80%81%e8%80%90105c%e9%ab%98%e6%ba%ab/