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dp83848 与dp83640 MDIO 寄存器读取问题

Other Parts Discussed in Thread: DP83640

通过MDIO对寄存器进行读取时,例如MISR,为何第一次读取正常,(0x00002C00),紧接着再次读取时,读出来是0(0x00000000),用示波器查看波形,波形与数值吻合,为何会出现这样的问题呢。我用两个板子,分别对dp83640和dp83848操作,都是同样的问题。哪位大侠指点下,谢谢。