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DP83848K: SQ/NOPB

Part Number: DP83848K

LED_SPEED管脚驱动RJ45绿色LED时出现100M亮绿灯,10M不亮灯的问题,概率为0.2%,其余都是100M不亮灯,10M是亮灯的情况,两种情况下都是能够正常通信的。原理图也是如下所示,其中下拉电阻是270Ω,而在AN1上电启动时LED_SPEED管脚电压在1.8V,则被判断为低电平,如果LED_SPEED管脚为1.75V,则LED_SPEED管脚被判定为高电平3.3V输出,两者的电压相差这么小,也会处于临界值吗?请问芯片内部LED驱动器的架构是什么样的,会导致如此奇怪的问题???