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C6748下载程序的问题

自己按照TI的参考电路,设计了C6748的电路,板子与JTAG可以连接,板子设计的时候ALE和CLE均通过4.7K的上拉电阻接3.3V,板子上电后,NANDFLASH的ALEpin始终为高电平,CLEpin始终为低电平。加载nandwrite.out后,出现下图情况。不知道自己的板子哪里有问题。谢谢