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rMa1's avatar
rMa1
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5 years ago
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how to integrate SG-DMA into the PCIe Hard IP core with AVMM interface

My design is using PCIe Hard IP core with AVMM-DMA interface, but the DMA descriptor length is limited lower than 128, I want to use 256 or larger than 256, how should I do?

Modular scatter-gather dma(in platform designer IP catalog) could select larger descriptor length, how to integrate SG-DMA into the PCIe Hard IP core with AVMM interface to resolve this problem, does I need open NIOS II to use the SG-DMA?

  • SengKok_L_Intel's avatar
    SengKok_L_Intel
    5 years ago

    Hi,


    Yes, the descriptor controller supports up to 128 descriptors, and this is unable to change to a larger number. Regarding to the modular SG-DMA, this is not necessary to use NIOS to configure. You can use any of the AVMM interfaces to configure the modular SG-DMA, for example, PCIe BAR.


4 Replies

  • SengKok_L_Intel's avatar
    SengKok_L_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Hi,


    Yes, the descriptor controller supports up to 128 descriptors, and this is unable to change to a larger number. Regarding to the modular SG-DMA, this is not necessary to use NIOS to configure. You can use any of the AVMM interfaces to configure the modular SG-DMA, for example, PCIe BAR.


    • rMa1's avatar
      rMa1
      Icon for New Contributor rankNew Contributor
      5 years ago

      Thanks SengKok.

      Does there have the example design for PCIe hard core with AVMM interface using external DMA? if yes, I could replace the normal DMA to SGDMA for the fast testing.

  • SengKok_L_Intel's avatar
    SengKok_L_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    I have checked with the team, unfortunately, there is no such example available. Thanks.


  • SengKok_L_Intel's avatar
    SengKok_L_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    If further support is needed in this thread, please post a response within 15 days. After 15 days, this thread will be transitioned to community support. The community users will be able to help you with your follow-up questions.