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EK—TM4C1294连接不上

Other Parts Discussed in Thread: EK-TM4C1294XL

新买的EK-TM4C1294XL,EK开发板通过交换机和电脑互联。但是串口终端没有显示IP,也就是没有获取到IP。通过跟踪代码,发现PHY一直连接不上,
bHaveLink=MAP_EMACPHYRead(EMAC0_BASE,0,EPHY_BMSR)&EPHY_BMSR_LINKSTAT;该程序返回语句一直为false。读取该寄存器EPHY_BMSR的值,发现Auto_Negotiation Complete (ANC) 为0,LINKSTAT为0.
不知道什么原因,求大神指教。