Content addressable memory (cam) engine

G - Physics – 11 – C

Patent

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Details

G11C 15/04 (2006.01) G11C 7/10 (2006.01)

Patent

CA 2309820

A content addressable memory ("CAM") engine (100) or controller interfaces between a host signal processor (e.g., a microprocessor) and a plurality of known, commercially-available random access memory ("RAM") devices. The CAM engine (100) configures the RAM as content addressable memory, thereby causing the normally location-addressd RAM to function as CAM. The CAM engine (100) thus allows for the benefits of both RAM and CAM devices, such as speed, density, cost and intuitiveness, without their inherent drawbacks. Further, the CAM engine (100) implements various flexible memory storage configurations for the keys and associations stored in RAM. Also, the CAM engine (100) implements certain algorithms that provide for the hashing of data, for table load and unload capabilities, for proximity matching, for dealing with overflow conditions, and for implementing hierarchical search capabilities.

L'invention concerne un moteur (100) ou contrôleur à mémoire associative ("CAM") servant d'interface entre un processeur de signal hôte (par exemple, un microprocesseur) et une pluralité de dispositifs RAM connus de la technique et disponibles dans le commerce. Le moteur (100) à mémoire CAM configure la mémoire RAM comme une mémoire associative, ce qui fait fonctionner la mémoire RAM, normalement à adresse physique, comme une mémoire CAM. Le moteur (100) à mémoire CAM tire ainsi profit des avantages que présentent chacune des mémoires RAM et CAM, notamment en termes de vitesse, de densité, de coût et d'intuitivité, sans tenir compte de leurs défauts inhérents. En outre, le moteur (100) à mémoire CAM met en oeuvre diverses configurations flexibles de stockage mémoire pour les touches et les associations stockées dans la mémoire RAM. Enfin, le moteur (100) à mémoire CAM met en oeuvre certains algorithmes permettant assurant le hachage des données, des fonctions de chargement et de déchargement de tables, la recherche de proximité, le traitement des états de débordement et la mise en oeuvre de fonctions de recherche hiérarchique.

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