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我在642平台上调出来的EMIF时序RE在CE无效的时候RE保持为高电平，而6455的EMIF的RE在CE无效时始终保持低电平；
就是在下图中的阴影网格部分，642的RE是高电平，6455的RE一直是低电平：
阴影部分不代表高或低电平。
