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EK-TM4C1294XL MAC接收到的所有数据包都是CRC错误

EK—TM4C1294开发板通过网线直接和台式机相连,给台式机发送ARP请求,台式机可以收到,台式机也回应了ARP,但是开发板收不到。通过查看寄存器,发现这些数据包都是CRC错误。请问怎么回事?