Asynchronous data extraction apparatus

摘要

The appts includes a first clock that provides a first clock signal having a first clock rate. A data interface samples a data stream at the first clock rate to produce a sampled data stream. A data stream clock recovery element is operably coupled to the data interface and the first clock. The data stream clock recovery element recovers a first representation of the data stream clock from the sampled data stream and where the first representation of the data stream clock is synchronous to the first clock signal The data stream clock recovery element includes an edge detector that detects edges in the sampled data stream to produce detected edges. A missing edge detector is operably coupled to the edge detector, where the missing edge detector produces an injected edge when the edge detector does not produce one of the detected edges within a predetermined amount of time.