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关于dm368 的nand坏块



你好,我们的项目用到了dm368,  emif总线和FPGA相连,FPGA根据emif的地址译码产生nand的片选cs信号,其余的nand的ale cle直接连着emif的两根地址线,emif的we_n, oe_n直接连着nand的we和re, 368单独操作FPGA时nand不会有坏块出现,单独操作nand时也不会有坏块出现,但是当368同时操作nand和FPGA是就有坏块出现,请问有哪些原因可能导致这种情况。