Digital Design can be implemented by various design styles. And depending on the market requirement different design styles are used.
- Programmable Logic Design
- Field Programmable Gate Array (FPGA)
- Gate Array
- Standard Cell (semi custom design)
- Full Custom Design
- Field Programmable Gate Array (FPGA):
- Using VHDL or verilog
- Implementation
- Placement and Routing
- BitStream Generation
- Analyse timing, view layout, simulations etc
- Gate Array: Gate Array design implementation is done with metal design and processing. The implementation requires two-step manufacturing process
- First phase, which is based on standard masks, results in an array of uncommitted transistors on each GA chips
- These uncommitted chips can be customized later, which is completed by defining the metal interconnects between the transistor of the array
- In this chip utilization factor is higher than that of FPGA
- Chip speed is higher
- Standard Cell or Semi Custom Design:
- The standard-cells based design is often called semi custom design.
- The cells are pre-designed for general use and the same cells are utilized in many different chip designs.
- Full Custom Design
- Full custom design involves creating IC where each individual transistors architecture and interconnections are specified. Designers manually place transistors, resistors,capacitors and other components at the transistor level
