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DM368 EMIF总线操作

我现在用DM368+FPGA结构,DM368的EMIF总线连接FPGA和NAND FLASH,NAND FLASH连接EM_CE0,FPGA连接EM_CE1,DM368启动方式NAND FLASH。我现在的问题是,当配置为NAND FLASH启动时,EM_CE0一直为低,并且不能操作EM_CE1?请问是怎么回事呢?