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    • 5. 发明授权
    • Phase-change memory (PCM) based universal content-addressable memory (CAM) configured as binary/ternary CAM
    • 配置为二进制/三进制CAM的基于相变存储器(PCM)的通用内容寻址存储器(CAM)
    • US07675765B2
    • 2010-03-09
    • US11267781
    • 2005-11-03
    • Narbeh DerharcobianColin Neal Murphy
    • Narbeh DerharcobianColin Neal Murphy
    • G11C15/04
    • G11C11/5678G11C13/0004G11C15/046
    • Content-addressable memory (CAM) cells comprised of phase change material devices (PCMDs), including PCMD-based binary CAM cells (PCMD-based BCAM cells), PCMD-based ternary CAM cells (PCMD-based TCAM cells), and PCMD-based universal CAM cells (PCMD-based UCAM cells). The PCMDs of the various PCMD-based CAM cells are configured and programmed in a manner that allows a logic “0” or a logic “1” to be stored by the CAM cell. The logic value stored by a given PCMD-based CAM cell depends on the program states of the PCMDs. A program state of a PCMD is determined by whether the phase change material of the PCMD has been allowed to solidify to a crystalline, low-resistance state during a programming operation, or whether the phase change material of the PCMD is forced to solidify to an amorphous, high-resistance state during the programming operation.
    • 由包括基于PCMD的二进制CAM单元(基于PCMD的BCAM单元),基于PCMD的三元CAM单元(基于PCMD的TCAM单元)和PCMD-based三元CAM单元组成的包括相变材料装置(PCMD)的内容寻址存储器(CAM) 基于通用的CAM单元(基于PCMD的UCAM单元)。 各种基于PCMD的CAM单元的PCMD以允许CAM单元存储逻辑“0”或逻辑“1”的方式进行配置和编程。 由给定基于PCMD的CAM单元存储的逻辑值取决于PCMD的程序状态。 PCMD的编程状态由PCMD的相变材料是否已被允许在编程操作期间凝固成晶体,低电阻状态,或者PCMD的相变材料是否被迫固化为 非线性,高电阻状态。