上电现象不一样：
第一次：不能显示PHY连接，收发数据无法操作
EMAC has been started successfully
[C64XP_0] Registeration of the EMAC Successful
[C64XP_0] Network Added: If-1:200.200.180.99
第二次如下：能显示PHY连接，但不能正常收发数据，抓不到任何包
] Registeration of the EMAC Successful
[C64XP_0] Network Added: If-1:200.200.180.99
[C64XP_0] Link Status: 100Mb/s Full Duplex on PHY 1
上面两种现象随机出现
