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28335看门狗复位无法拉低XRS

Other Parts Discussed in Thread: CONTROLSUITE

电路使用CPLD(EPM7128S)给dsp复位,将cpld的io口连接到XRS管脚上。现在为解决访问xintf死机的问题,使用看门狗复位,但是看门狗复位无法拉低XRS,XRS信号低电平为2.3V左右,请问如何解决?