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C6748加载Nandwrite.out后的出现的烧写程序问题

按照TI的参考设计,我想问一下,当C6748与Nandflash连接后,R/B、RE、CE、ALE、CLE、WE、WP这7个管脚,在上电时各个管脚的电平情况,以及加载nandwrite.out后运行时这7个管脚的情况。我这边的情况是上电后所有的均为高电平,运行后CLE为低电平。但是我的目的想ALE=0,CLE=1。有谁知道这是怎么回事,问题都在哪?谢谢

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