full-custom - meaning and definition. What is full-custom
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What (who) is full-custom - definition

DESIGNING AN INTEGRATED CIRCUIT FROM THE GROUND UP
Full-custom

full-custom         
Design of integrated circuits at the transistor or polygon level. This is in contrast to the use of libraries of components. Full-custom design requires considerable skill and experience and is usually only feasible for simple circuits, especially ones with much repetition, such as memory device, where a small saving in the size and power consumption of a component will yield a large overall saving. (1994-12-01)
Full custom         
Full-custom design is a methodology for designing integrated circuits by specifying the layout of each individual transistor and the interconnections between them. Alternatives to full-custom design include various forms of semi-custom design, such as the repetition of small transistor subcircuits; one such methodology is the use of standard cell libraries (standard cell libraries are themselves designed using full-custom design techniques).
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Wikipedia

Full custom

In integrated circuit design, full-custom is a design methodology in which the layout of each individual transistor on the integrated circuit (IC), and the interconnections between them, are specified. Alternatives to full-custom design include various forms of semi-custom design, such as the repetition of small transistor subcircuits; one such methodology is the use of standard cell libraries (which are themselves designed full-custom).

Full-custom design potentially maximizes the performance of the chip, and minimizes its area, but is extremely labor-intensive to implement. Full-custom design is limited to ICs that are to be fabricated in extremely high volumes, notably certain microprocessors and a small number of application-specific integrated circuits (ASICs).

As of 2008 the main factor affecting the design and production of ASICs was the high cost of mask sets (number of which is depending on the number of IC layers) and the requisite EDA design tools. The mask sets are required in order to transfer the ASIC designs onto the wafer.