https://blog.wongcw.com/2021/11/03/dram%e5%83%b9%e6%a0%bc%e9%80%b2%e5%85%a5%e4%b8%8b%e8%a1%8c%e9%80%b1%e6%9c%9f-%e4%b8%89%e6%98%9f%e5%92%8csk%e6%b5%b7%e5%8a%9b%e5%a3%ab%e5%b0%87%e5%95%9f%e5%8b%95%e5%87%ba%e8%b2%a8%e6%8e%a7%e5%88%b6/