| 摘要 |
An all digital PLL-based data detector for use in a disc media reproducer or recorder for receiving input read data read from a disc storage medium and providing an output sync signal and synchronized read data with jitter substantially eliminated. The PLL circuit is provided with a circuit for limiting the fed-back count value to a predetermined range so as to limit the internal sync signal to a desired range, a circuit for resetting a predetermined portion of the digital PLL-based circuit during an invalid period when input read data are expected to be invalid to thereby ensuring a normal operation after the invalid period, and/or a circuit for generating, from a given clock signal of a first frequency, a second clock signal of a second frequency different from the first frequency to thereby support a different data rate.
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