Riverbed Interview Question for Software Engineer / Developers

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Memory mapped I/O allows the CPU to control hardware by reading and writing specific memory addresses. Usually this would be used for low-bandwidth operations such as changing control bits.

DMA allows hardware to directly read and write memory without involving the CPU. Usually this would be used for high-bandwidth operations such as disk I/O or camera video input.

From: h t tp://stackoverflow.com/questions/3851677/what-is-the-difference-between-dma-and-memory-mapped-io

- Bandicoot March 09, 2011 | Flag Reply

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