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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/888011/dp83640-dp83640-100-mb-length-detect-register-len100det-page-2-0x14
一旦建立链路、LEN100DET 寄存器中的数据是否有效？ 或者、是否有一个特定的链路诊断序列需要为该寄存器执行以包含电缆长度估算？
尊敬的 John：
电缆长度估算仅在具有有效链路状态指示的100MB 操作期间有效。
谢谢、
Nikhil
