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CLA scratchpad Memory

dineshkumar mani
Intellectual 300 points
Other Parts Discussed in Thread: CCSTUDIO

Dear Experts,

   I want to learn about scratchpad memory allocation, and I want to understand difference between  energy consumption of scratchpad memory allocation and normal cache memory allocation, where should i start ?, is ccstudio  would show energy level graph ?, which processor is suitable for beginner level of Scratchpad memory allocation?  pls guide me!.....

Thanks in advance!....

  • Guru 192875 points
    Hi Mani,

    Check this wiki article on CLA which covers lot of data-points on Scratchpad:
    processors.wiki.ti.com/.../C2000_CLA_C_Compiler

    Also, go through this thread:
    e2e.ti.com/.../461859

    Regards,
    Gautam
  • in reply to Gautam Iyer
    Intellectual 300 points

    I have read those links earlier!.....I didn't get what I expect!...

    pls share, how to learn differentiate between scratch pad memory and cache?

    Actually, what I'm looking, Want to RUN a application with scratchpad memory allocation and after the same application code without scratchpad memory allocation

  • in reply to dineshkumar mani
    TI__Mastermind 20850 points

    dineshkumar mani said:
    pls share, how to learn differentiate between scratch pad memory and cache?

    There is no cache on the F28035. Now, RAML1, L2 can be used as CLA data RAM on this device (by configuring some bits in the MMEMCFG register); you could configure these RAMs to act as CLA data ram and then place the scratchpad section (.scratcpad) in either (or both) of these RAMs. I should point out that the scratchpad acts as sort of a stack for the CLA.

    dineshkumar mani said:
    Actually, what I'm looking, Want to RUN a application with scratchpad memory allocation and after the same application code without scratchpad memory allocation

    If you are using C code for the CLA then you will need to allocate the .scratchpad section to a viable location that is accessible to the CLA.

  • in reply to Vishal_Coelho
    TI__Mastermind 20850 points
    Additionally, a good resource on the CLA C compiler is the compiler guide SPRU514, Chapter 10 which goes over the language implementation.
  • in reply to Vishal_Coelho
    Intellectual 300 points
    Dear Mr.Vishal,
    is it possible to study differentiate of cache memory allocation scratchpad memory allocation?,
    which IC has both cache and scratchpad memory options?
  • in reply to dineshkumar mani
    TI__Mastermind 20850 points

    dineshkumar mani said:
    is it possible to study differentiate of cache memory allocation scratchpad memory allocation?,

    I'm not quite sure i understand the question. The CLA scratchpad is not a physical memory like a cache. You basically pick one of the two physical RAML(1/2) and assign the logical section .scratchpad to it in the linker command file. The CLA C compiler will then store all the local, auto variables, function arguments etc to this memory - the CLA does not have access to the c28x stack pointer (SP) and its associated addressing modes; there are no PUSH POP operations on the CLA. The compiler team had to come up with a way to support a stack-like memory for C implementation and, so came up with the scratchpad - again its a logical (not physical) memory section

    dineshkumar mani said:
    which IC has both cache and scratchpad memory options?

    To my knowledge none of the c2000 devices have a cache. Ill verify4 with our memory expert