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A '''gate array''' or '''uncommitted logic array''' (ULA) is an approach to the design and manufacture of [[application-specific integrated circuit]]s (ASICS). A gate array circuit is a prefabricated silicon chip circuit with no particular function in which [[transistor]]s, standard [[NAND]] or [[NOR]] [[logic gate]]s, and other [[active device]]s are placed at regular predefined positions and manufactured on a [[wafer (electronics)|wafer]], usually called '''master slice'''. Creation of a circuit with a specified function is accomplished by adding a final surface layer metal interconnects to the chips on the master slice late in the manufacturing process, joining these elements to allow the function of the chip to be customised as desired. This layer is analogous to the copper layer of a single-sided printed circuit board [[PCB]].
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