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Cache memory: - The cache memory is employed in computer systems to compensate for the speed differential between main memory access time and processor 10gic.CPU logic is usually faster than main memory access time, with the result that processing speed is limited primarily by the speed of main memory. Mapping of memory:- The basic characters tics of cache memory is its fast access time. Therefore, very little or no time must be wasted when searching for words in the cache. The transformation of data from main memory to cache memory is referred as a mapping process. Three types of mapping procedures are of practical interest when considering the organization of cache memory: Associative mapping, Direct mapping and Set-associative mapping.