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DM8168连接仿真器出错



用DM8168做视频会议产品,前三个版本正常,调试第四个版本时出现连接仿真器出现如下图的问题,第四版与第三版相比PCB改小了一些,DDR和DM8168基本没有变(只有仿真的走线改了下),哪位大神有好的建议没有?