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    • 9. 发明授权
    • Multi-frequency synchronizing clock signal generator
    • 多频同步时钟信号发生器
    • US06914852B2
    • 2005-07-05
    • US10835360
    • 2004-04-28
    • Joo S. Choi
    • Joo S. Choi
    • G11C7/10G11C7/22G11C11/4076G11C8/00
    • G11C29/028G11C7/1066G11C7/1072G11C7/22G11C7/222G11C11/4076G11C29/50012
    • An apparatus and method for generating a plurality of synchronizing signals for synchronizing operation of the device in which the apparatus is located, such as in semiconductor memory devices. The apparatus can generate a plurality of synchronizing signals based on a corresponding plurality of input clock signals and select one of the synchronizing signals to be provided as the synchronizing clock signal. Alternatively, the apparatus can generate a plurality of internal clock signals based on an input clock signal, and generate a corresponding plurality of synchronizing signals from the plurality of internal clock signals. One of the synchronizing signals is selected by the apparatus as the synchronizing clock signal. Alternatively, the apparatus can receive a clock signal, generate a synchronized clock signal therefrom, and generate a synchronizing pulse in response to number of periods of the synchronized clock signal, the number based on a selection signal provided to the apparatus.
    • 一种用于生成多个同步信号的装置和方法,用于使设备所处的装置的操作同步,诸如在半导体存储器件中。 该装置可以基于相应的多个输入时钟信号产生多个同步信号,并选择要提供的同步信号之一作为同步时钟信号。 或者,该装置可以基于输入时钟信号产生多个内部时钟信号,并且从多个内部时钟信号产生相应的多个同步信号。 其中一个同步信号由装置选择为同步时钟信号。 或者,该装置可以接收时钟信号,从其产生同步的时钟信号,并且响应于同步时钟信号的周期数,产生基于提供给该装置的选择信号的数量的同步脉冲。
    • 10. 发明授权
    • Read command triggered synchronization circuitry
    • 读命令触发同步电路
    • US08295120B2
    • 2012-10-23
    • US13169587
    • 2011-06-27
    • Joo S. Choi
    • Joo S. Choi
    • G11C8/00
    • G11C11/4076G11C7/1051G11C7/1066G11C7/22G11C7/222G11C11/4096
    • A system having a processor, a memory controller coupled to said processor, a plurality of dynamic random access memory (DRAM) chips coupled to said memory controller and at least one of said DRAM chips comprising a clock synchronization circuit to receive a reference clock signal and to output a synchronized clock output signal. The system has a plurality of signal buses coupling the processor to the memory controller and the memory controller to said DRAM chips. The signal line conveys signals from said memory controller to said clock synchronization circuit to turn on and off the clock synchronization circuit according to control logic. A memory READ command triggered clock synchronization mode turns on a clock synchronization circuit only for memory READ operations. The clock synchronization circuit achieves a signal lock with the reference clock signal in less time than the column address strobe latency. Precise memory READ operations are thus possible without wasting power when such operations are not performed by allowing the clock synchronization circuitry to be turned off.
    • 一种具有处理器,耦合到所述处理器的存储器控​​制器,耦合到所述存储器控制器的多个动态随机存取存储器(DRAM)芯片和至少一个所述DRAM芯片的系统,所述DRAM芯片包括时钟同步电路以接收参考时钟信号和 输出同步的时钟输出信号。 该系统具有多个信号总线,该处理器将存储器控制器和存储器控制器耦合到所述DRAM芯片。 信号线将来自所述存储器控制器的信号传送到所述时钟同步电路,以根据控制逻辑打开和关闭时钟同步电路。 存储器READ命令触发时钟同步模式仅对存储器读操作打开时钟同步电路。 时钟同步电路在比列地址选通延迟更短的时间内实现了具有参考时钟信号的信号锁定。 因此,当通过允许时钟同步电路被关闭而不执行这种操作时,精确存储器读操作就可能不浪费电力。