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    • 1. 发明授权
    • Method for enabling scan of defective ram prior to repair
    • 修复前能够对有缺陷的公牛进行扫描的方法
    • US07266737B2
    • 2007-09-04
    • US11180416
    • 2005-07-13
    • Paul A. BunceJohn D. DavisPatrick J. MeaneyDonald W. Plass
    • Paul A. BunceJohn D. DavisPatrick J. MeaneyDonald W. Plass
    • G11C29/00
    • G11C29/48G01R31/318533G11C29/88G11C2029/3202
    • A semiconductor memory circuit enabling replacement of defective memory elements and associated circuitry with non-defective spare elements of the RAM and associated circuitry, is scanned to enable replacement of a defective RAM element prior to repair of the RAM. A set of set/reset latches are coupled to receive the signal from the memory elements, and a multiplexer control circuit coupled to receive a shift signal and a ram_inhibit signal from a multiplexer to provide specific input signals to the multiplexer components. When a scan operation begins an active clock signal sets a set/reset latch to ram_inhibit mode and this blocks the memory elements from influencing the state of memory output latches, whereby when an memory operation begins, an active clocking signal will reset the set/reset latch into system mode to cause the multiplexers pass appropriate signals from the memory elements to the output latches, and the spare memory element is activated to replace a defective memory element.
    • 扫描能够用RAM和关联电路的无缺陷备用元件替换缺陷存储器元件和相关电路的半导体存储器电路,以便在修复RAM之前更换有缺陷的RAM元件。 耦合一组置位/复位锁存器以接收来自存储器元件的信号,以及多路复用器控制电路,其被耦合以从多路复用器接收移位信号和ram_inhibit信号以向多路复用器部件提供特定的输入信号。 当扫描操作开始时,活动时钟信号将设置/复位锁存器设置为ram_inhibit模式,并且阻止存储器元件影响存储器输出锁存器的状态,由此当存储器操作开始时,有源时钟信号将复位置位/复位 锁存到系统模式以使多路复用器将适当的信号从存储器元件传递到输出锁存器,并且备用存储器元件被激活以替换有缺陷的存储器元件。