What is synthesis in VLSI is a question that is expected to be answered by a VLSI student. Nevertheless, it is a subject that worries many. In the VLSI design process, Synthesis occurs between the RTL Design & Verification phase and the Physical Design phase. Generally, the conversion of one idea level into another is the definition of synthesis. Before delving into Synthesis, we must first grasp a few principles regarding flows in order to provide an overview. Front-end engineers develop code in a variety of languages, including Verilog, system Verilog, VHDL, etc., during the RTL Design phase and then they test the programs at the verification stage. Once the RTL code has been validated, we move on to the Synthesis step of VLSI Design. The circuit is being converted to logic codes at this stage.
The simple RTL design undergoes synthesis to become a gate-level netlist with all of the designer-specified limitations. Synthesis, to put it simply, is the process of turning an abstract design into a correctly implemented chip in terms of logic gates. Multiple stages are involved in the synthesis. Making RTL into basic logic gates is the initial step. Following that, we must map those gates to actual technology-dependent logic gates that are readily available in technology libraries. The next step is to optimize the mapped netlist while maintaining the designer’s limitations. Vendors like Synopsys, Cadence, and Mentor Graphics offer a variety of tools that may be used to synthesize a design.
Now you know what is synthesis in VLSI. But why exactly are they important? The process of synthesis is crucial for designers because it allows them to visualize how the design will actually appear after manufacture. Only the designer may report and check all factors in advances, such as area, time, and power. Before the actual fabrication process begins, he or she can make the necessary adjustments (if necessary), saving both time and money. Synthesis has a variety of objectives. Obtaining a Gate-level Netlist is one. Other important objectives are the insertion of clock gates, the insertion of DFT logic, and logic optimization. Needless to say, it is a very integral step for chip designers that cannot be avoided.
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