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求助,关于6455EMIF寄存器PERCFG1



只要一配置EMIFACTL=1使能EMIF,EMIF的SADS/SRE脚就变为低,RE再也变不了高电平,EMIFACTL置0也一样;

EMIF已配置了R_ENABLE=1,SSEL=1,同步模式,其它默认,EMIF信号除RE外其它都正常,求助RE一直为低电平没法用啊,从机要判断读使能;