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how about MMU?

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billy nguyen
Posted by
on Jan 20 2011 10:28 AM
Intellectual290 points

Hi guys,

I have a problem in my reserching, it is function of MMU-Memory Management Unit in microcontroller lm3s8962. And without MMU, what capacity will a microcontroller loose?

thanks in advance,

Billy.

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  • billy nguyen
    Posted by
    on Jan 20 2011 10:29 AM
    Intellectual290 points

    Hi guys,

    what function is MMU in a microcontroller?

    thanks,

    billy

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  • Robb Sabolovic
    Posted by
    on Jan 20 2011 11:11 AM
    Intellectual1860 points

    Hi Billy,

    Would you please explain your question further?  There is not an MMU (Memory Management Unit) inside the lm3s8962.  There is a MPU (Memory Protection Unit), but it is not an MMU and it is not intended to support virtual memory.

    If you only need to protect your system resources and tasks from unwanted access, then you can use the MPU, but if you need to support virtual memory, then the MPU cannot support this.

    Please refer to section 3.1.4 Memory Protection Unit (MPU) in the lm3s8962 device datasheet. 

    Best Regards,

    Robb

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  • billy nguyen
    Posted by
    on Jan 20 2011 22:35 PM
    Intellectual290 points

    Hi Robb,

    I know that there is MPU in lm3s8962, but when I surfed web, i saw many definition of MMU, including protection memory, but i have not understood MMU yet, such as the action of MMU, the important of virtual address, if a microcontroller have no MMU or MPU, what will happen?

    thanks,

    Billy

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  • Colombo Carlo
    Posted by
    on Jan 21 2011 03:08 AM
    Expert4965 points

    Hi  Robb ,

    please  you can find more detials on MPU  in  ARM  intro to cortexm3  paper     here   :    http://www.arm.com/pdfs/IntroToCortex-M3.pdf  

    about mmu  ,  a nice start  can be wikipedia :    http://en.wikipedia.org/wiki/Memory_management_unit 

    best regards

    Carlo

     

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