本帖最后由 aozima 于 2017-4-7 09:31 编辑
不同的信号，有不同的最大容差的。
https://en.wikipedia.org/wiki/Media-independent_interface
National recommends running 50 Ω traces with 33 Ω (adds to driver output impedance) series termination resistors for either MII or RMII mode to reduce reflections.[citation needed] National also suggests that traces be kept under 0.15 m long and matched within 0.05 m on length to minimize skew.
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