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DP83848 BMSR值为0X7849

dp83848无法完成初始化,读BMCR的值为0X3100,读BMSR的值为0x7849.查数据手册,BMSR寄存器第5位为0解释为自动协商过程未完成。可能的原因有哪些?我使用的是STM32F107芯片,工作模式设置的RMII模式。