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28377s复位引脚上电异常

各位大神:

    本人板子上的28377的复位引脚悬空的情况下,电平为3.3V,但会出现闪低现象,大概15ms一次闪低,此时程序烧写报错,指向reset 脚;加阻容复位,10k上拉加22uF电解,上电后该复位引脚为2.7V~2.9V的波动电压,波动频率为15mS;减小上拉电阻至1K,复位引脚仍为波动电压,为2.9V~3.1V,此时程序烧写报错,指向reset 脚;更换电解电容,复位管脚波形无改善,仍烧不进程序。

    此时DSP的供电电压3.3V和1.2V均正常,无抖动及纹波。

    DSP外部仅为最小系统,只有晶振,电源,jteg及滤波电容。

    本人甚是着急,请帮忙解答,不胜感激!