| 摘要 |
This invention relates to an error detection circuit for detecting errors in a recovered clock signal from a self-clocking digital data signal. A first flip-flop is alternately set and reset by the recovered clock signal and by a clock source of supposedly equal frequency, respectively. The output of the first flip-flop is sensed by a second flip-flop at the end of a predetermined time period, as determined by the clock source, for determining that a transition in the recovered clock source occurred within the predetermined time period. If no transition occurred within the predetermined time period, the second flip-flop outputs an error signal. |
