{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9720847","patent":{"patent_number":"US-9720847","title":"Least recently used (LRU) cache replacement implementation using a FIFO storing indications of whether a way of the cache was most recently accessed","assignee":null,"inventors":[],"filing_date":"2013-07-17T00:00:00.000Z","publication_date":"2017-08-01T00:00:00.000Z","cpc_codes":["G06F","G06F","G06F","G06F","G06F","G06F"],"num_claims":18,"abstract":"A method and apparatus for calculating a victim way that is always the least recently used way. More specifically, in an m-set, n-way set associative cache, each way in a cache set comprises a valid bit that indicates that the way contains valid data. The valid bit is set when a way is written and cleared upon being invalidated, e.g., via a snoop address, The cache system comprises a cache LRU circuit which comprises an LRU logic unit associated with each cache set. The LRU logic unit comprises a FIFO of n-depth (in certain embodiments, the depth corresponds to the number of ways in the cache) and m-width. The FIFO performs push, pop and collapse functions. Each entry in the FIFO contains the encoded way number that was last accessed."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Least recently used (LRU) cache replacement implementation using a FIFO storing indications of whether a way of the cache was most recently accessed","description":"A method and apparatus for calculating a victim way that is always the least recently used way. More specifically, in an m-set, n-way set associative cache, each way in a cache set comprises a valid b","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9720847","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9720847","citation_suggestion":"Patentable. \"Least recently used (LRU) cache replacement implementation using a FIFO storing indications of whether a way of the cache was most recently accessed\" (US-9720847). https://patentable.app/patents/US-9720847","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9720847","json":"https://patentable.app/api/llm-context/US-9720847","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T13:35:48.212Z"}