Method and apparatus for detecting a data receiving error

摘要

A receiver unit for receiving asynchronous digital data signals. The receiver includes a clock recovery unit operative for receiving the asynchronous serial data signal and for producing a clock signal corresponding to the asynchronous serial data signal; a sampling gate operative for receiving the asynchronous serial data signal and the clock signal as input signals, and for producing a sampled data signal, where the sampled data signal corresponds to the asynchronous serial data signal and is synchronized with the clock signal; a first counter for receiving the asynchronous serial data signal and operative for counting each pulse contained in the asynchronous serial data signal; a second counter for receiving the sampled data signal and for counting each pulse contained in the sampled data signal; a subtractor circuit for subtracting the value of the second counter from the value of the first counter, and for generating a result value; and an error indication circuit for monitoring the result value of the subtractor and for generating an error signal when the result value exceeds a predetermined value.