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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
    Note: This was originally posted on 23rd June 2011 at http://forums.arm.com


    I have some questions related to this file: http://pulsar.websha...x-A8-cycle.xlsx
    1. Why does some lines is darker than others? What does it mean?
        For example: line that contains "MUL::MLA" is darker.
    2. What does "::" mean? For example,  "MUL::MLA" or "MUL::SMLAWB"


    Color line are just for me the color is not used for the parsing.
    MUL::MLA define a specific shortcut rules.
    the firts MUL is not a instruction but a shortcut name you found in the MUL line column W

    That just mean that

    if the MLA intruction is executed just after a instruction that have MUL into column W then
      use this rules (MUL::MLA)
    else
      use standard MLA rules
    endif ;)

    Etienne
Reply
  • 0
    Note: This was originally posted on 23rd June 2011 at http://forums.arm.com


    I have some questions related to this file: http://pulsar.websha...x-A8-cycle.xlsx
    1. Why does some lines is darker than others? What does it mean?
        For example: line that contains "MUL::MLA" is darker.
    2. What does "::" mean? For example,  "MUL::MLA" or "MUL::SMLAWB"


    Color line are just for me the color is not used for the parsing.
    MUL::MLA define a specific shortcut rules.
    the firts MUL is not a instruction but a shortcut name you found in the MUL line column W

    That just mean that

    if the MLA intruction is executed just after a instruction that have MUL into column W then
      use this rules (MUL::MLA)
    else
      use standard MLA rules
    endif ;)

    Etienne
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