What is Memory-Management Unit (MMU)?

->Hardware device that maps virtual to physical address.In MMU scheme, the value in the relocation register is added to every address generated by a user process at the time it is sent to memory.->The user program deals with logical addresses; it never sees the real physical addresses.

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rakesh trichy
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Oct 12th, 2008

A memory management unit (MMU), sometimes called paged memory management unit (PMMU), is a computer hardware component responsible for handling accesses to memory requested by the central processing unit (CPU). Its functions include translation of virtual addresses to physical addresses (i.e., virtual memory management), memory protection, cache control, bus arbitration, and, in simpler computer architectures (especially 8-bit systems), bank switching.VAX pages are 512 bytesThe IBM System/370 have had an MMU since early 1970s, it was initially known as DAT box.The DEC Alpha processor divides memory into 8192-byte pages