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How many L2 memory in C6678 ?

xi su
Intellectual 725 points
Other Parts Discussed in Thread: TMS320C6678

As the datasheet say :　Each C66x CorePac of the TMS320C6678 device contains a 512KB level-2 memory (L2)．

It seems there are 512*8KB L2 inC6678, but what about the Local L2 SRAM(0x00800000) ?

Is the L2 memory is 512*8KB or 512*9KB in C6678?

  • 0
    Guru 10750 points

    Hi Xi,

    Each core (In the case of the C6678, 8 cores) have 512KB of L2 memory, you can see that on the device user guide (sprs691c.pdf) memory map paragraph 2.3,

    Thanks,

    HR

  • 0 in reply to HRi
    Intellectual 725 points

    HRi said:

    Hi Xi,

    Each core (In the case of the C6678, 8 cores) have 512KB of L2 memory, you can see that on the device user guide (sprs691c.pdf) memory map paragraph 2.3,

    Thanks,

    HR

    But what about the  Local L2 SRAM(0x00800000)  ? Is it only a global address map for each core or its really  exist ?

  • 0 in reply to xi su
    Guru 10750 points

    Hi Xi,

    OK, each Core L2 have private address and global address the private address is the same address for all the cores and it is 0x00800000, so you have one private address and 8 global addresses, if core X or any external interface want's to access core Y L2 than he needs to use the global address,

    Thanks,

    HR

  • 0 in reply to HRi
    Intellectual 725 points

    HRi said:

    Hi Xi,

    OK, each Core L2 have private address and global address the private address is the same address for all the cores and it is 0x00800000, so you have one private address and 8 global addresses, if core X or any external interface want's to access core Y L2 than he needs to use the global address,

    Thanks,

    HR

    SO there are 8*512KB L2  memory in C6678 , the memory start 0x00800000 only a private address , its never exist , is it right?

  • 0 in reply to xi su
    Guru 10750 points

    Hi Xi,

    You are correct, please note that the address 0x00800000 exist but it can be used only by the core itself so for example core 0 L2 memory can be access at 0x0080 0000 (private) and at  0x1080 0000 (global),

    Thanks,

    HR

  • 0 in reply to HRi
    Intellectual 725 points

    Thanks very much !