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    • 36. 发明授权
    • Microprocessor having a content addressable memory (CAM) device as a functional unit therein and method of operation
    • 具有内容可寻址存储器(CAM)装置作为功能单元的微处理器及其操作方法
    • US06792502B1
    • 2004-09-14
    • US09689028
    • 2000-10-12
    • Mihir A. PandyaGary L. Whisenhunt
    • Mihir A. PandyaGary L. Whisenhunt
    • G06F1200
    • G06F9/3885G11C15/00
    • A microprocessor architecture (310) has a plurality of functional units arranged in a parallel manner between one or more source buses (412 and/or 414) and one or more result buses (490). At least one of the functional units within the architecture is a content addressable memory (CAM) functional unit (430) which can be issued CPU instructions via a sequencer (480) much like any other functional unit. The operation of the CAM (430) may be pipelined in one or more stages so that the CAM's throughput may be increased to accommodate the higher clock rates that are likely used within the architecture (310). One embodiment involves pipelining the CAM operation in three stages (510, 520, and 530) in order to sequentially perform data input and precharge operations, followed by match operations, and followed Finally by priority encoding and data output.
    • 微处理器架构(310)具有在一个或多个源总线(412和/或414)与一个或多个结果总线(490)之间并行布置的多个功能单元。 架构内的功能单元中的至少一个是内容可寻址存储器(CAM)功能单元(430),其可以与任何其他功能单元类似地经由定序器(480)发出CPU指令。 CAM(430)的操作可以在一个或多个阶段中流水线化,使得可以增加CAM的吞吐量以适应架构(310)中可能使用的较高时钟速率。 一个实施例涉及以三个阶段(510,520和530)流水线CAM操作,以便顺序执行数据输入和预充电操作,随后进行匹配操作,随后最后通过优先编码和数据输出。