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fpga DP83848 时钟输出问题

现在用的xilinx的MAC核配置为MII模式,但是程序下载进去后RX_clk和TX_clk没有输出,硬件正常,因为原始程序都可以被电脑识别。请问这个可能是什么原因导致的83848不正常工作的?