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DP83640时间戳读不出值

Other Parts Discussed in Thread: DP83640

最近在研究dp83640芯片,配置的是光口接受,用STM32配置DP83640的,通过SMI接口读写寄存器,现在的情况是,读写其他寄存器都可以,芯片也有反应,但是读取recieve_timestamps寄存器读出来老是0,PTP_RXCFG1配置好了,PTP_RXCFG3中的自动打时间戳功能也是关闭的,然后读取状态寄存器PTP_STS寄存器的RXTS_RDY的值是1,配置RXTS_IE中断也能产生相应的中断,请问是什么原因呢,难道是没收到数据包???