Content addressable memory chip
AssigneeRenesas Electronics Corporation
InventorMasanobu Kishida
Life of this patent
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Abstract
A content addressable memory chip which can perform a high speed search with less error is provided. A match amplifier zone determines coincidence or non-coincidence of search data with data stored in the content addressable memory cells in an entry of a CAM cell array, according to the voltage of a match line. The match amplifier zone comprises one or more NMOS transistors and one or more PMOS transistors. The match amplifier zone has a dead zone to an input of a voltage of the match line, and has a property that no flow-through current is present in the match amplifier zone.
Claims17
A content addressable memory chip comprising:
- a memory array with content addressable memory cells arranged in a matrix;
- a plurality of match lines each coupled with a plurality of content addressable memory cells belonging to a corresponding entry of the memory array;
- and
- a plurality of match amplifiers each operable to determine one of coincidence and non-coincidence of search data with stored data in the content addressable memory cells in the entry of the memory array, according to a voltage of corresponding one of the match lines,
- wherein each of the match amplifiers comprises
- one or more NMOS transistors and one or more PMOS transistors, and
- wherein each of the match amplifiers has a dead zone to an input of a voltage of corresponding one of the match lines, and has a property that no flow-through current is present in each of the match amplifiers.
Dependencies are inferred from the claim text.