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==Construction==
Electronic logic is often constructed from small electronic circuits called [[logic gate]]s. Each logic gate represents a function of [[boolean logic]]. A logic gate is an arrangement of electrically controlled switches. The output is an electrical [[Electrical current|flow]] or [[Electrical potential|voltage]], that can, in turn, control more logic gates. Logic gates often use the fewest number of transistors.
Another form of electronic logic is constructed from lookup tables, usually described as "[[programmable logic device]]s". These can perform all the same functions as machines based on logic gates, but lookup tables can be easily reprogrammed without changing the wiring. This means that a designer can often repair errors without changing the arrangement of wires. Therefore, in small volume products, programmable logic devices are often the preferred solution. They are usually designed by engineers using [[electronic design automation]] software.
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