Electrical Engineering › Section T · Combinational logic › Topic T.1
Combinational circuits and universal NAND and NOR gates
Wire a handful of gates together with no feedback and you get a combinational circuit: its outputs depend only on the inputs present right now. This topic shows how to read such a circuit, how to build one from a specification, and why a designer can do it all with a single type of gate.
In this topic
- Circuits with no memory
- AND-OR and AND-OR-Invert
- Exclusive-OR and exclusive-NOR from basic gates
- From a specification to a circuit
- Worked example: a majority-vote circuit
- NAND and NOR are universal
- Dual symbols: negative-OR and negative-AND
- Worked example: the vote circuit in NAND gates only
- Pulse waveforms and timing
- Describing the circuit in VHDL
- Common mistakes to avoid
- Key takeaways
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