手册memmap描述"External SDRAM space on EMIF 0x8000 0000 0x8FFF FFFF Byte and Word“,这个空间范围是2Gb,但是具体描述为”C6727B 将 SDRAM 支持扩展至 256M 位和 512M 位器件“,是不是以512Mb为准
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