| 摘要 |
A phase lock signal generation unit includes a phase difference signal generation unit for generating a phase difference signal between a reference clock signal and an internal clock signal; a phase shift detection unit for generating a signal indicating a release of a phase lock signal LOCK when phase shifts occur continuously two times in predetermined intervals in a phase different signal; and a wait time count unit which is controlled by an output from the phase shift detection unit, and releases the phase lock signal.
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