An energy saving cache algorithm

Set associative caches have fixed ways. All cache ways of accessed set are enabled during cache access. This paper proposes an algorithm to map address to fixed cache way of mapped set. The tag of the address is XOR´d with (w-1) in w-way set associative cache. The result is divided into blocks of size of number of cache ways w. The average of maximum and minimum of the frequency of the result of division is the mapped way. The mapped way is accessed. All other cache ways are in non-operational mode during cache access. Only one cache way is operational in this mapping. The proposed model is simulated with SPEC2K benchmarks. An average improvement in AMAT of 58% is observed with 49% improvement in energy consumption.