Detector of a 1 followed by 1 in a sequence of 0s
Either I am missing something, or this is pretty straightforward.
Look at the diagram below. when the second 1 gets clocked in, your output switch to 0, and stays 0 until you reset the circuit for the next sequence. If no double zero appear in the stream, output stays 1.







simulate this circuit &ndash; Schematic created using CircuitLab