Full Custom Design VS Semi Custom Design Style

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 In this section we will learn the two important VLSI chip design Style.


From the chip performance curve vs design time we found that if we follow the full custom designstyle then performance is high but at the same time it takes longer design time to get the chip in the market and if we follow the semi custom design style then design time is less as compared to the full custom but at the same time performance is less.

More details on the full custom and semi custom design style are below

Full Custom Design:-
  1. In Full custom design , all logics cells , circuits or layout are designed specifically.
  2. As we start from basic transistor level to chip ,the design time and complexity is more.
  3. According to our need we can optimized the performance as well as Area in full custom design.
  4. This design style is not widely used.when there is no way left to design we prefer full custom design.
  5. High labor cost and used for high-volume product design.
          Example:- Microprocessor,memory chips and FPGA masters.

Semi Custom Design:-
  1. In Semi Custom Design ,Designer starts with pre-designed and pre-tested logic cells.Pre-designed means all gates,MUX, and some complex logic cells are kept in library after tested and we start designing from here.
  2. As we start from the standard cell ,the design time and complexity is less.
  3. Performance is limited to the certain limit or we can say performance is less compared to the Full custom Design.
  4. Most widely used design style.
  5. less costly as compared to full custom design.
         Example:-Digital logics


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