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the functions of sdram

YongchaoDeng
Intellectual 965 points

I see many cmd file that include internal RAM in sections but not include external SDRAM.Is that same functions between internal ram and external sdram?

Can i use external sdrams like internal ram?

  • 0
    TI__Mastermind 24340 points

    Hi,

    I'm not sure if I entirely understand your question. The cmd file should match the amount of internal RAM that the DSP has and the amount of external RAM that your board have. You can put your code in either of them, but trying to keep your critical sections in internal RAM as the access to internal RAM is much faster.

  • 0 in reply to Mariana
    TI__Mastermind 18130 points

    Mariana's correct. The SDRAM will behave much like the internal RAM but much slower. This does not take things like cache into effect, but from a general standpoint the SDRAM is always slower than ISRAM.

    Sometimes a linker command file found in an example may not define the SDRAM because the example code is small enough to fit inside the internal memory. Because the ISRAM is faster to use it makes more sense to ignore the SDRAM.