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c6678低温零下40度网口不通



c6678(工业级) 低温零下40度网口(88e1111工业级)不通,常温高温下网口正常都能正常启动,请问这可能是什么原因导致的?

我查了88e1111的供电和晶振都是正常的,另外做了4块板子,有三块都是正常的,

只有一块低温零下40度网口不通,问题板其他接口测试都是ok的(ddr/emif/srio等)

请指点。谢谢!