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TLK3118的RCLK信号检测不到怎么办?

在TLK3118+FPGA的XGMII端收发Loopback测试中,RCLK检测不到,而其REFCLK输入正常,各电源轨供电正常;有的时候能检测到RCLK,有的时候却不能,不稳定;