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dm8127 pcie refclock

大家好!

今天量了一下pcie的SERDES_CLKP和SERDES_CLKN,发现这两个引脚是input口,为什么会有1V左右的偏置电压呢?

input口怎么会有偏置电压?

我们的pcie link不上。是不是哪里需要设置?