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求助,DP83867接收问题!

自研采集卡,FPGA加DP83867进行网络通信,采集卡直接给PC发数据,PC接收不丢包。但是采集卡接收时,经常会出现30ms左右的时间接收不到数据,这是RXD、RXDV、RXDER都为0。