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F28388D的SPI



之前是想用EMIF接口外扩256M的NOR   FLASH,后来发现28388D的异步接口的最大空间都达不到256M。所以换了一种思路,想用SPI接口外扩256M的NOR   FLASH。不太确定是否可以这样扩,如果,不行的话,SD卡,应该也是可以代替NOR  FLASH吧。