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Cortex A8 Instruction Cycle Timing

barney vardanyan
Note: This was originally posted on 17th March 2011 at http://forums.arm.com

Hi) sorry for bad English

I need to count latency for two instruction, and all I have is the arm cortex A 8 documantation(charter 16) !
but I have no idea how can do this work using that documantation(
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  • 0 Arm Employee Badge
    Note: This was originally posted on 15th April 2011 at http://forums.arm.com

    If you are using time to measure the elapsed time for a very short program then the odds are that most of the time is spent loading the program from storage and setting up the memory map.

    Try setting up the timing function inside your program binary and measure a relatively large block of  instructions so that the measurements overheads are small relative to the measurement.

    Iso
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  • 0 Arm Employee Badge
    Note: This was originally posted on 15th April 2011 at http://forums.arm.com

    If you are using time to measure the elapsed time for a very short program then the odds are that most of the time is spent loading the program from storage and setting up the memory map.

    Try setting up the timing function inside your program binary and measure a relatively large block of  instructions so that the measurements overheads are small relative to the measurement.

    Iso
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