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Altera_Forum's avatar
Altera_Forum
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19 years ago

sharing some memory

Hey guys

I am doing a project at school.

I have this problem.

I am going to use 2 processors in Quartus, one of them doing some ethernet gathering and should save it in some memory.

The second proc. is doing a lot of pio,uart and some more, and should use the saved memory form the first proc..

Please dont answer the short version as, put the 2 processors in one.....

What should I be aware of? which memory should I use.

It should be a fast system.

I know in advance that I should be aware of which proc. using the memory.

I am using the cylone dev. kit.

In advance thanks :-)

Imagine

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    Try to go for a tightly coupled shared memory, or for an on-chip memory to implement the communication.

    If you cannot, just use the sdram or sram that comes with the evaluation board. You can share these memories too, although you can expect some performance loss due to the conflicts in accessing the same memory... but at least you can try.

    If you want, take a look at the 2 CPU demo we distribute on the Evidence web site at the erika enterprise literature page (http://www.evidence.eu.com/nios2/literature.asp). We used it successfully and it can be a first start in using multicore Nios II systems. If you have a 1s40 evaluation board, we have also a basic 4 cpu design...

    If you are going to use the HAL, you will need to share the data explicitly by the various application in the CPUs, like the way you can find in the Altera Multiprocessor Tutorial. Sharing data become simpler if you use ERIKA Enterprise, because it will handle automatically the allocation of the multicore shared memory. You can try the evaluation version available for free in the Evidence page... and if you need some less restrictive demo version for your demo just send me a mail...

    bye

    Paolo
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    Hey Paolo

    Thanx very much it was a very nice template.

    Best regards

    Imagine