A gate array or uncommitted logic array (ULA) is an approach to the design and manufacture of
application-specific integrated circuits (ASICs). A gate array circuit is a prefabricated silicon chip circuit with no particular function in which
transistors, standard
NAND or
NOR logic gates, and other
active devices are placed at regular predefined positions and manufactured on a
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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an integrated circuit made up of digital logic gates that are not yet connected. Typically gate arrays are fabricated up to the metal layers and then a custom metal mask is designed for a customer and used to connect the gates into a customer specific circuit.
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