| 摘要 |
<p>PURPOSE:To prevent the increase of the circuitry monitoring the fluctuation of frequency in the clock synchronization system outputting clocks in synchronism with an input clock. CONSTITUTION:Respective input clocks with dissimilar frequency is frequency- divided into the same cycle by a frequency dividing section 1. One of the frequency division clocks outputted from the section 1 is selected by a selector section 2 and the selected frequency division clock is added as an incoming clock of a synchronization section 3 to take out the synchronization clock in synchronism with the input clock. A frequency fluctuation monitoring section 4 is provided to input an incoming clock to the synchronization section 3 outputted from the selector 2 and monitor the frequency fluctuation of the synchronization clock outputted from the section 3.</p> |
