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Hyperlink PCB 设计关于2lane与4lane问题



大家好!我正在做Hyperlnk PCB的设计,遇到以下2个疑惑:

1. 在Hardware Design user guide中看到这段话“In the event a partial number of lanes are used (two lanes instead of four), all clock and data pins must be connected. Unused lanes (both transmit and receive) can be left floating”。
    问题:确认一下是否可以只连接2条lane(即只连接2条lane的差分收发),其他2条悬空,如果可以,该怎样选择哪两条?
 
希望各位能够帮我解答一下!多谢!