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GPMC读写问题



我想让3530的GPMC和FPGA传输数据,为什么GPMC时序配置好后,能完成单独的读和写,把读写一起操作的时候就会出错,要么读不到要么写不进去,中间加个时延也没用,求解释啊

//8位异步时序最大配置

#define FPGA_GPMC_CONFIG1 0x0

#define FPGA_GPMC_CONFIG2 0x001E1E01 //CS从1-30,持续29 FCLK

#define FPGA_GPMC_CONFIG3 0x000E0E02 //从1-9,读写地址使能,持续8 FCLK

#define FPGA_GPMC_CONFIG4 0x1D0C1D0C //从12-29,读写access,持续17 FCLK

#define FPGA_GPMC_CONFIG5 0x011C1F1F //整个读写周期为32 FCLK,读access持续28 FCLK

#define FPGA_GPMC_CONFIG6 0x00000FCF //写access持续28 FCLK

#define FPGA_GPMC_CONFIG7 0x00000F60 //对应地址0x20000000