7.1.1.3 High-speed (480 Mb/s) Driver Characteristics 章节看到这样一段 ，
When each of the data lines is terminated with a 45 Ω resistor to the device
ground, the effective load resistance
on each side is 22.5 Ω. Therefore, the line into which the drive current is
being directed rises to 17.78 ma *
22.5 Ω or 400 mV (nominal). The other line remains at the device ground
voltage. When the current is directed
to the opposite line, these voltages are reversed.
我现在不理解为何能将 D+ 和 D- 的 45 Ohm 的接地电阻等效成并联，有没有高手能从电
路理论的角度分析一下，谢谢！
附上我自己的理解，不知道哪里不对。
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