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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-gathe...
  • 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.


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.