Application specific full custom design integrated circuit is a methodology for making a logic cell, circuit or layout specification. Full custom design circuit is the part of Application Specific Integrated Circuit (ASIC). A gate array or uncommitted logic array as an approach to the design and manufacture of application specific integrated circuit. It requires custom chip fabrication using a complete set of unique masks which define the semiconductor processing of the design. A full custom IC includes some logic cells that are customized using microprocessor full custom IC.