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C6748如何应用256MB DDR2?

现在用的是MT47H128M16芯片,根据自己的理解它有256MB空间的,我对照手册配置后,还是只能正常操作128MB的空间。

搜索资料,没看到有关“256MB DDR2应用”的GEL文件或者SDRAM芯片选用,有些困惑。

请问能给我一些建议吗?是我选用的芯片本身只能访问128MB空间,还是说GEL配置没有对呢?