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Thanks Ted!
I shall start with getting familiar with qsys.
In a tutorial about DDR3 SDRAM controller with UniPHY using qsys, I see a DMA controller is added in the qsys hierarchy. I'm not clear about this, since from other documents I see that external memory controller can be directly connected to other qsys components through avalon MM bus, then what is DMA controller for here?
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Anything with an Avalon-MM Master interface can connect to the external memory. The tutorials typically show a NIOS and DMA controller simply because that is a common / desirable elements of a system. From your initial post, your system might only have 3 components in it (your new component, the on-chip memory, the memory controller).
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