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DP83620光通信的问题

Other Parts Discussed in Thread: DP83620

您好!想问下DP83620要配置为光口除了将硬件FX_EN_Z引脚通过2.2K电阻接地外,寄存器还需要进行配置吗?

我们现在电口能够正常通信,通过2.2K电阻将FX_EN_Z引脚接地,使用光口,可是光口不能通信,这是为什么?

还有就是发送端50Ω的上拉电阻是必须的吗?