Double click on electric to open it. A window will be displayed which will have File, Edit, Cell, Export,View, Window, Tools and Help options on the tool bar. On the left hand side pane, you will find a window which has three options namely : Layers, Components and Explorer. You will learn more about these options as we go ahead with the design.

Design Rule Check (DRC) determines whether the layout of a chip satisfies a series of recommended parameters called design rules. Design rules are set of parameters provided by semiconductor manufacturers to the designers, in order to verify the correctness of a mask set.

Routing optimization is a step performed after detailed routing in the flow. Inaccurate modeling of the routing topology may cause timing, signal integrity and logical design constraint related violations. This may cause conditions wherein fixing a violation would create other violations and many such scenarios may cascade to make it very difficult for timing closure with no timing DRCs.

The LEF file is the abstract view of cells. It only gives the idea about PR boundary, pin position and metal layer information of a cell. To get the complete information about the cell, DEF (Design Exchange Format) file is required. In this 3 sections are defined, i.e. technology, site, macros. In the technology part layers, design rules, via definitions and metal capacitance are defined.

Synthesis is process of converting RTL (Synthesizable Verilog code) to technology specific gate level netlist (includes nets, sequential and combinational cells and their connectivity).

Standard cells are designed based on power, area and performance. First step is cell architecture. Cell architecture is all about deciding cell height based on pitch & library requirements. We have to first decide the track, pitch, β ratio, possible PMOS width and NMOS width.

Clock Tree Synthesis (CTS) is one of the most important stages in PnR. CTS QoR decides timing convergence & power. In most of the ICs clock consumes 30-40 % of total power. So efficient clock architecture, clock gating & clock tree implementation helps to reduce power.

Routing is the stage after Clock Tree Synthesis and optimization where- Exact paths for the interconnection of standard cells and macros and I/O pins are determined. Electrical connections using metals and vias are created in the layout, defined by the logical connections present in the netlist.

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Physical design is process of transforming netlist into layout which is manufacture-able [GDS]. Physical design process is often referred as PnR (Place and Route) / APR (Automatic Place & Route). Main steps in physical design are placement of all logical cells, clock tree synthesis & routing.