Matching detection method and circuit of content addressable memory cell

A technology for addressing memory and storage units, applied in static memory, digital memory information, information storage, etc., can solve the problems of large power consumption, consumption, waste of matching signal lines, etc., to reduce current consumption, reduce current consumption, reduce The effect of bias voltage and bias current
CN102403018AInactive Publication Date: 2012-04-04INST OF ACOUSTICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF ACOUSTICS CHINESE ACAD OF SCI
Publication Date
2012-04-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a matching detection method and circuit of a content addressable memory cell. The matching detection method comprises the steps of: carrying out charging or charging control on a charge circuit of a first matching signal wire and a feedback control circuit of a second matching signal wire; when contents of an NOR memory cell are matched and a voltage difference exists between the matching signal wires, outputting a matching signal; and when the contents of the NOR memory cell are mismatched and no voltage difference exists between the matching signal wires, not outputting the matching signal. The matching detection method is simple and reliable, and has the advantages of reduction in additional offset voltage and offset current and further reduction in power consumption in comparison with the traditional matching detection method of the memory cell.
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Description

technical field

[0001] The present invention relates to a content addressable memory, in particular to a matching detection method and circuit of a content addressable memory storage unit. Background technique

[0002] Content-Addressable Memory (CAM) is a content-addressable memory for specific high-speed search applications. Its working principle is: when the user provides a piece of data, CAM will traverse the entire storage space to search whether the data exists in the storage, and if so, CAM will return one or more addresses where the hit data exists. CAM is a special memory that searches the entire memory in a single operation. Therefore, in search applications, CAM is much faster than ordinary memory. The fast search feature of CAM makes CAM especially suitable for applications such as network equipment, central processing unit, and video hard codec.

[0003] The storage unit structure of traditional content addressable memory is divided into NAND type storage uni...

Claims

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