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DP83848K: 无法建立连接,ping不通

Part Number: DP83848K

使用GD32F450与DP83848K设计网络部分。使用RMII模式,MCU提供50Mhz时钟,MCU可以与83848 PHY正常通信,读取PHY value,完成初始化,网络接口绿灯及黄灯亮。但是无法与主机建立TCP/UDP连接,也无法ping通,请教是什么问题?