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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1276226/faq-can-auto-negotiation-link-up-with-force-mode-on-100mbps
DUT
连接方
链路接通/无链路接通
自动协商
链路接通
强制模式100Mbps
无链路建立
注：
当 PHY 最初设置为自动协商模式并且您想要将 PHY 编程或配置为强制100Mbps 模式时、为了在强制模式100Mbps 下执行链路、需要在软件配置后进行软件复位(0x001F 至4000)。
