Abstract
AbstractCache coherency refers to the ability of multiprocessor system cores to share the same memory structure while maintaining their separate instruction caches. Cache coherency is used in coherence protocols to maintain data consistency between cache memory in multiprocessor systems. All cores have the same design, share same main memory (MM) and have their own cache memory. Whenever a core requests a block of data from MM for its cache, it needs a protocol to broadcast the status of blocks in MM and cores. Various hardware and software-based cache coherent mechanisms including contemporary protocols, have been thoroughly explored. This survey focuses on analyzing the different cache coherence techniques used in SoC devices. With a variety of cache coherence techniques to choose from, the best strategy is determined by a number of factors such as latency, scalability and so on.KeywordsCache coherenceProtocolsMain memoryCoherence mechanism and SoC
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