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DS90UH940-Q1: DS90UH940调试有毛刺

dana tu
Prodigy 30 points
Part Number: DS90UH940-Q1

DS90UH940的GPIO0控制寄存器0x1D配置为0x3做为input IO；GPIO0外部输入管脚CH1_AUXAudio_SDOUT由FPGA控制，电气配置为output LVCOMS18，

理论上GPIO0高电平希望为1800mv，低电平为0mv，实际测量GPIO0低电平为750mv低不下来(系统上电DS90UB941A与DS90UH940对接，DS90UB941A不发送视频，DS90UH940 GPIO0电平为750mv). 有关寄存器配置有没参考代码？