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    • 1. 发明授权
    • Semiconductor integrated circuit and information processing system
    • 半导体集成电路和信息处理系统
    • US07668675B2
    • 2010-02-23
    • US12129179
    • 2008-05-29
    • Toshio TakitaJun OgawaYoshihiro Tamura
    • Toshio TakitaJun OgawaYoshihiro Tamura
    • G01R25/04
    • H03L7/08H03K5/19
    • In a semiconductor integrated circuit, a counter counts the number of high-speed clock signals that have been generated in a predetermined number of clock cycles of a low-speed clock signal. In synchronization with the low-speed clock signal, the semiconductor integrated circuit compares the counter value and a predetermined value, and judges whether the frequency of the high-speed clock signal has reaches a predetermined frequency. Since variations in the frequency become smaller as the oscillation of a high-speed oscillator stabilizes, the semiconductor integrated circuit detects that the oscillation is stable when the semiconductor integrated circuit has judged affirmatively a plurality of times.
    • 在半导体集成电路中,计数器对在低速时钟信号的预定数量的时钟周期中产生的高速时钟信号的数量进行计数。 与低速时钟信号同步,半导体集成电路将计数器值和预定值进行比较,判断高速时钟信号的频率是否达到预定频率。 由于随着高速振荡器的振荡稳定,频率的变化变小,当半导体集成电路多次判断时,半导体集成电路检测到振荡稳定。
    • 2. 发明授权
    • Semiconductor integrated circuit and communication system
    • 半导体集成电路与通信系统
    • US08401136B2
    • 2013-03-19
    • US12570206
    • 2009-09-30
    • Yoshiaki FujiwaraToshio Takita
    • Yoshiaki FujiwaraToshio Takita
    • H04L7/00
    • G06F1/04G06F1/08H03K21/38
    • Disclosed is a semiconductor integrated circuit for generating a frequency division clock signal that approximates a desired clock signal without increasing a size thereof. The semiconductor integrated circuit masks, for each programmable cycle, a clock signal to be supplied to a transmission clock generation unit 100, thereby delaying a counting operation of a clock counter 101, and setting a timing for extending a transmission clock signal so as to cause a transmission rate of an average frequency of the transmission clock signal to approximate a predetermined transmission rate, wherein the transmission clock generation unit 100 divides a frequency of a clock source signal S301 that is a high-speed clock signal.
    • 公开了一种半导体集成电路,用于在不增加其尺寸的情况下产生近似所需时钟信号的分频时钟信号。 半导体集成电路在每个可编程周期中屏蔽要提供给发送时钟生成单元100的时钟信号,从而延迟时钟计数器101的计数操作,并设置用于延长发送时钟信号的定时,从而使 传输时钟信号的平均频率的传输速率接近预定的传输速率,其中传输时钟产生单元100将作为高速时钟信号的时钟源信号S301的频率除除。