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28035 上电之后周期性复位



请问dsp的复位脚XRS出现这种周期性波形是怎么回事啊?神们      dsp也连不上仿真器     是刚焊好的28035的板子   各级电源都正常     晶振4MHz   查看X1脚有对应的波形       现在板子连不上仿真器,求大神或者遇到过此类问题的帮帮我!谢谢啦