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C6678主频上不去



自己做的板子,C6678的可调核电压CVDD本来是按照参考设计设置成可调的,但是由于设计失误,目前只能采用外接固定电源1V供电。

问题是C6678的主频上不去,最高只能跑到400MHz。不知道是什么问题引起的,会不会跟CVDD采用固定电压供电有关?