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It depends on the kind of performance that you want. You can create an Avalon slave interface and have the CPU write all the integers one by one to your hardware. But if the only thing your hardware does is a multiplication I don't think it ill be a lot faster than doing it in software.
If you want a bettor performance it makes sense to use a DMA that will read the integers from your memory and give them to your custom hardware.
I'm not a Verilog expert, but I think that if you do a search on the forum you should find some Verilog templates for Avalon slave interfaces.
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This simple 'sum of products' example is a starting step for me. Later on, there will be larger arrays and more calculations, something similar to an image processing task. So if I create a dma and access the data using the dma address in nios, how do i interface that data with the simple 'sum of products' verilog module? Do i still need those PIO, fifo, etc? Sorry for asking such basic questions.
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