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DP83848K的RMII模式TX_CLK有25MHz时钟信号

Other Parts Discussed in Thread: DP83848K

DP83848K采用RMII模式,TX_CLK(PIN2)管脚空接,上电以后该管脚有25MHz的方波信号发出,而且幅度很高,峰峰值大概4V,严重影响RE,请问有没有寄存器配置可以在RMII模式下关掉TX_CLK的输出信号?谢谢!