| 摘要 |
A semiconductor memory that reduces power consumed by a CAM. A storage circuit has stored a plurality of patterns of information indicative of whether to activate each memory word block. If specification information for specifying a predetermined pattern from among the plurality of patterns of information which has been stored in the storage circuit is input, an activation circuit activates each content addressable memory word block according to a specified pattern. If data to be retrieved is input, a specification circuit specifies a content addressable memory word which has stored data corresponding to the data to be retrieved from among a group of content addressable memory words activated by the activation circuit. As a result, activation will be performed by the content addressable memory word block. Therefore, by activating only necessary content addressable memory words, consumption of power can be reduced.
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