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Why Cortex-R series is real time oriented ?

Ravinder

Hi Forum,

Why Cortex-R series is real time oriented than other ISA(ARM/others) ?

Is there a list of all the points and comparison with ARM Cortex-A ?

Why we can not make Cortex-A to suite for real time, which brings to think of Cortex-R ?

I am trying to understand from a software developer point of view.

Thanks,

Ravinder Are

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    Hi are and probablly all,

    simply, I think the important points are TCM (i.e. no cache usage) and MPU (i.e. no MMU). Caches and an MMU behaviors don't have deterministic processing time, because of their mishits.


    By the way, I think if the lockdown features would be implemented for caches (especially L1 caches) and the MMU, the caches and the MMU could be usable even under the real time environment. However, regarding recent trend of the ARM architecture implementation, the lowdown feature sometimes (or always) was ignored. I would like to know the reason.

    Best regards,
    Yasuhiko Koumoto.

Reply
  • 0

    Hi are and probablly all,

    simply, I think the important points are TCM (i.e. no cache usage) and MPU (i.e. no MMU). Caches and an MMU behaviors don't have deterministic processing time, because of their mishits.


    By the way, I think if the lockdown features would be implemented for caches (especially L1 caches) and the MMU, the caches and the MMU could be usable even under the real time environment. However, regarding recent trend of the ARM architecture implementation, the lowdown feature sometimes (or always) was ignored. I would like to know the reason.

    Best regards,
    Yasuhiko Koumoto.

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