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DP83822I: TDR模式,以及0X0173寄存器无法写入。

Part Number: DP83822I

在实现DP83822I的TDR模式,按照How to use the TDR Feature of DP83822进行的寄存器配置和读取。但0X0173寄存器无法设置成功,0xFFFF写进去,再读出来就是0x00ff。
另一方面,忽略0X0173寄存器直接进行TDR实验,读0x1E位可以读到0x11,TDR运行成功。但是无论我插拔网线(一端连接到DP83822I,另一端空置),还是换长短网线,0x180寄存器的值始终不变。