• Memory mapping is used to convert logical address space to physical memory, however physical memory is sometimes limited in capacity. External memory can be accessed by the microprocessor. Memory mapping is a technique for increasing physical memory access.
• The translation between the logical address space and physical memory is known as memory mapping. Memory mapping has three goals: (1) to convert logical to physical addresses, (2) to enhance memory protection , and (3) to improve memory resource management.
• Both locally (how long it takes to execute an instruction) and globally, mapping is critical to computer performance (how long it takes to run a set of programs). In effect, the mapping mechanism must translate a logical memory address into a proper physical memory location each time a programme requests that the accompanying memory word be accessed.

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