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PHASE SYNCHRONIZING METHOD, PHASE SYNCHRONIZING CIRCUIT, SYSTEM FOR DETECTING DATA SPEED AND SELF-ADVANCING OSCILLATING PERIOD CONTROL MEANS FOR PHASE SYNCHRONIZING CIRCUIT
PHASE SYNCHRONIZING METHOD, PHASE SYNCHRONIZING CIRCUIT, SYSTEM FOR DETECTING DATA SPEED AND SELF-ADVANCING OSCILLATING PERIOD CONTROL MEANS FOR PHASE SYNCHRONIZING CIRCUIT
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机译:相同步方法,相同步电路,用于检测数据速度的系统以及用于相同步电路的自进振荡周期控制装置
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摘要
PURPOSE:To surely execute phase synchronization in a shot time even when data to be widely different in data speeds mixedly exist by phase-synchronizing the output of an oscillating circuit controlled in a self-advancing oscillating period specified with the data speed of read data beforehand to a reference signal synchronizing with the read data at the arbitrary data speed. CONSTITUTION:An oscillation permitting signal 13 is generated by the rise of read data 12, and the oscillation is started in a voltage controlled oscillator 5 by the signal. When the portion of one pulse of a reference signal 15 is outputted by such an output 14, the signal 13 is made oscillation-inpermissible by the fall of the pulse, and the oscillator 5 is stopped. Since oscillators 5 and 1 are oscillated by the self-advancing oscillations in the period equal to the ideal oscillating period specified with a data transfer speed according to a control signal 17 beforehand, a reference signal pulse width is equal to a clock signal pulse width T specified from the read data, and it is made equal to the self-advancing oscillating period of the oscillator 10. Thereafter, the phase difference between the reference signal 15 and an oscillating clock signal 22 is detected by a comparator 7, and the advance and lag of the phase are controlled according to it.
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