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%86/1394a-6%e9%92%88%e5%bc%af%e5%a4%b4%e7%94%b5%e7%bc%86/