| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a clock and data recovery circuit and a recovery method, and a station-side apparatus employing the recovery circuit, capable of preventing occurrence of a phenomenon that, when entering a no-signal interval between burst signals, a frequency is temporarily deviated from that of a reference clock signal considerably. <P>SOLUTION: In the clock and data recovery circuit 10, including a recovery clock signal initializing means 10B for generating a recovery clock signal so that the frequency of a divided-frequency clock signal, obtained by dividing frequency of the recovery clock signal, becomes closer to that of a reference clock signal, when entering a no signal interval; a frequency divider 16 resets a current count value indicating a phase of the divided-frequency clock signal to a predetermined value, before the recovery clock signal initializing means 10B operates, and resumes counting with the timing of phase synchronization with the reference clock signal. Thus, phase synchronization is attained, prior to initialization of the frequency of the recovery clock signal. <P>COPYRIGHT: (C)2011,JPO&INPIT |
