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    • 1. 发明授权
    • Processor with free running clock with momentary synchronization to
subsystem clock during data transfers
    • 处理器具有自由运行的时钟,在数据传输期间具有与子系统时钟的瞬时同步
    • US5794019A
    • 1998-08-11
    • US787556
    • 1997-01-22
    • Thomas Basilio GendusoJoseph Michael Mosley
    • Thomas Basilio GendusoJoseph Michael Mosley
    • G06F1/12G06F1/08H03K3/03
    • H03K3/0315G06F1/08
    • A processor clock (302) is momentarily synchronized to a subsystem clock (307) during transfers of data between a processor (301) and a subsystem (305). After the completion of the data transfer, synchronization is disabled and the processor clock runs asynchronously at its own internal frequency, which is higher than the subsystem clock frequency. In one embodiment, the processor clock uses a free running ring oscillator (401) that is constructed on the same integrated circuit chip as the processor. Changes in temperature and power supply voltage not only cause changes in the maximum operating speed of the processor, but they also cause corresponding changes in the frequency of the processor clock. Thus, the frequency of the processor clock tracks changes in the maximum operating speed of the processor caused by temperature and power supply variations.
    • 在处理器(301)和子系统(305)之间的数据传输期间,处理器时钟(302)暂时同步到子系统时钟(307)。 数据传输完成后,同步被禁止,处理器时钟以其自身的内部频率异步运行,该频率高于子系统时钟频率。 在一个实施例中,处理器时钟使用与处理器相同的集成电路芯片上构建的自由运行环形振荡器(401)。 温度和电源电压的变化不仅会导致处理器的最大工作速度发生变化,而且会引起处理器时钟频率的相应变化。 因此,处理器时钟的频率跟踪由温度和电源变化引起的处理器的最大工作速度的变化。