Write to SRAM in vhdl; Then read into NIOS?

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The easiest way would be I think to design your own SOPC component, with an Avalon Master interface. Thus the component will be able to write to the memory, and the SOPC builder will automatically add some arbitrators to share the memory accesses between your component and the NIOS CPU.

Using a DMA component is another solution, depending on how you want to access the memory.

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Unfortunately I have limited experience creating SOPC components. Do you know of any documentation or (preferably) examples to help me on my way?