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The answer to your question is not straight forward. Long story short, we don't have any example on how to interface an external memory. Does it mean that it is not possible? In fact it is possible. While the D2000 hasn't MMU, it does have a DMA that can manage the SPI. This would allow you to implement a MMU in software. Bear in mind tha this is not an easy task as not having an MMU you have do the memory mapping and paging by software with the limitations that adds the fact that you are using the DMA...