METHOD OF STORING DATA IN A MEMORY CIRCUIT FOR AHO-CORASICK TYPE CHARACTER RECOGNITION AUTOMATON AND CORRESPONDING STORAGE CIRCUIT
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Abstract
A method of storing data in a memory circuit of an Aho-Corasick type character recognition automaton recognizes character strings by implementing successive transitions in a tree of nodes stored in a memory. Each node corresponds to a state of the automaton and to a recognition of a sequence of the character string. Each node is associated with a transition vector serves to determine the destination node or nodes of a transition. For storage of the data, a test is performed to find out whether transition vectors point to common destination addresses. The transition vectors are combined if the addresses to which the vectors point are separate by formulating a combination vector and the nodes are stored at the memory addresses pointed at by the combination vector.
25 Citations
45 Claims
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1-12. -12. (canceled)
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13. A method of storing data in a memory circuit of an Aho-Corasick type character recognition automaton, the method comprising:
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recognizing character strings by implementing successive transitions in a tree of nodes stored in the memory in which each node corresponds to a state of the automaton;
recognizing a sequence of each character string, with each node being associated with a transition vector used to determine at least one destination node of a transition;
determining if transition vectors point to common destination addresses;
combining the transition vectors to form a combination vector if the transition vectors do not point to a common destination address; and
storing the nodes at memory addresses pointed to by the combination vector. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of operating an Aho-Corasick type character recognition automaton circuit comprising:
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storing a tree of nodes in a memory in which each node corresponds to a state of the automaton;
recognizing character strings by implementing successive transitions in the tree of nodes stored in the memory;
recognizing a sequence of each character string, with each node being associated with a transition vector used to determine at least one destination node of a transition;
determining if transition vectors point to common destination addresses;
combining the transition vectors to form a combination vector if the transition vectors do not point to a common destination address; and
storing the nodes at memory addresses in the memory pointed to by the combination vector. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. An Aho-Corasick type character recognition automaton circuit comprising:
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a memory for storing a tree of nodes in which each node corresponds to a state of the automaton; and
a character recognition automation coupled to said memory and configured for recognizing character strings by implementing successive transitions in the tree of nodes stored in said memory, recognizing a sequence of each character string, with each node being associated with a transition vector used to determine at least one destination node of a transition, determining if transition vectors point to common destination addresses, and combining the transition vectors to form a combination vector if the transition vectors do not point to a common destination address, and storing the nodes at memory addresses in said memory pointed to by the combination vector. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification