https://zh.donghootech.com/%e4%ba%a7%e5%93%81/%e8%a7%86%e8%a7%89%e7%94%b5%e7%bc%86/ieee-1394-%e7%81%ab%e7%ba%bf%e7%94%b5%e7%bc%86/1394b-9%e9%92%88r-a%e4%b8%8a%e5%bc%af%e7%94%b5%e7%bc%86%ef%bc%8c%e5%b8%a6%e9%94%81%e7%b4%a7%e8%9e%ba%e9%92%89/