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dac3171 有时钟告警,无法输出



使用的是DAC 3171  7bit模式。FPGA有数据输出,也有随路时钟216M。但3171的config5 的alarm_dataclk_ gone有告警。用示波器测试有时钟216M输入到DAC里面,DAC无输出,请问还需要配置其它寄存器不?或者有肯是什么问题,多谢!!!