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C64x+ DSP Memory Paging (linker PAGE directive)

Elad Roichman
Intellectual 350 points

Hi,

I was wondering what is the meanning of the PAGE directive in the linker .cmd file? What does a PAGE mean on the DSP memory?

I would appreciate if anyone could explain to me about the paging system on C64x+ DSPs in general and specifically on the C6424.

Thanks in advance,

Elad.

  • 0
    TI__Guru* 84110 points

    The best answer is to tell you to ignore the linker PAGE directive.

    For background, this PAGE directive was required for other DSP architectures that were pure or slightly-modified Harvard architecture designs. In these cases. there could be a program memory at address 0x8000 and also a data memory at address 0x8000, just making up an example. When the DSP read an instruction, it would read from the program memory that was defined to be on PAGE=0; when the DSP accessed a data variable, it would read from the data memory that was defined to be on PAGE=1.

    This linker feature is not needed for C64x+ DSPs. Even though a modified Harvard architecture is still used for throughput reasons, the memory map is now a unified memory map where there is no address that is used in two different "pages".

     

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