| 摘要 |
PURPOSE:To extract a reception clock to fetch a reception data stably from the reception data by suppressing out of synchronism due to noise superimposed on the reception data with a flip-flop and a shift register. CONSTITUTION:A shift register 170 outputs a state signal 175 in response to the state of a reception data 100 and a change point of the reception data 100 is detected while avoiding noise by using a decoder 190 to decode the state signal 175. Moreover, the reception data 100 and a reception clock 110 are synchronized by resetting a counter 150 counting a source clock 120 and outputting the reception clock 110 or presetting a prescribed value to the counter 150 at the detection of a change point. Thus, the stable reception clock is extracted from the reception data without being affected due to noise such as spike at all times. |
