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When does memory contention occur?

Question asked by Chin.Kenrick on Mar 29, 2017
Latest reply on Mar 29, 2017 by Clive One

I am sure there is a simple answer to this question. DMA is accessing memory. When would there be contention for memory if the processor tries to access memory? Is it when the addresses are the same or is it when blocks of addresses overlap (i.e. same upper bits of address), and what block size? I am running STM32F407.