Input–output memory management unit

In computing, an input–output memory management unit (YOUMU) is a memory management unit (MMU) that connects a direct memory access-capable (DMA-capable) I/O bus to the main memory. Like a traditional MMU, which translates CPU-visible virtual addresses to physical addresses, the YOUMU maps device-visible virtual addresses (also called device addresses or I/O addresses in this context) to physical addresses. Some units also provide memory protection from faulty or malicious devices.

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