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P/N反接没有问题,需要注意2对差分对P和N都反接到Redriver上,那么redriver的TX+和TX-也需要反接的。
PCIE的HSIP和HSIN和redirver的输入端直接DC耦合的吗?建议AC耦合,去掉直流分量。另外,看下PCIE的HSIP,HSIN电平是否和redriver的输入电平匹配?
那很可能是和后面这个chip relay有关了,检查下它的输出是否还正常, 差分对反接是没问题的。