Quick aside: A OR B (inclusive OR) means (A or B) or (A and B), whereas A XOR B (eXclusive OR) means (A or B) but not (A and B). Generally, sequential circuits are much more interesting than combinational circuits, but you need working combinational circuits to create interesting sequential circuits, so for this project I'm concentrating on creating a robust combinational device. A counter is (usually) a sequential circuit - it has internal state (the current count) and that only changes when the clock rises. Everything happens as soon as the inputs change. This device is combinational rather than sequential or synchronous because it makes no use of internal state - there are no flipflops or clock signals. This image is used under the Creative Commons Attribution ShareAlive 3.0 license.
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