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OMAPL138 EMIFA CS3的地址空间是32M,挂512M Byte的NAND FLASH,访问原理



TI专家,各位朋友:

        OMAPL138 EMIFA CS3的地址空间是32M,我看CS3上挂的是512M Byte的NAND FLASH,32M的地址空间,是如何访问

512M Byte的NAND FLASH的呢?

谢谢!

  • 32MB地址空间是线性地址空间,针对Nor flash, Asyn SRAM等有data bus和address bus的异步memory的寻址空间。

    而NAND flash是没有address bus的,所以没有线性地址这一概念,地址是通过data bus传输的,所以理论上可以访问无限大的nand flash.