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以太网芯片DP83838IVV调试问题

user4738593
Intellectual 492 points
Other Parts Discussed in Thread: DP83848I

MCU采用ST的芯片，PHY芯片为DP83848IVV，调试时读取Basic Mode Status Register (BMSR)寄存器的LINK STATUS为0，0 = Link not established.，说明网络未建立连接，硬件检查起来没有问题了，会是什么原因？