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Concept
Physical design (electronics)
Summary
In integrated circuit design, physical design is a step in the standard design cycle which follows after the circuit design. At this step, circuit representations of the components (devices and interconnects) of the design are converted into geometric representations of shapes which, when manufactured in the corresponding layers of materials, will ensure the required functioning of the components. This geometric representation is called integrated circuit layout. This step is usually split into several sub-steps, which include both design and verification and validation of the layout.
Modern day Integrated Circuit (IC) design is split up into Front-end Design using HDLs and Back-end Design or Physical Design. The inputs to physical design are (i) a netlist, (ii) library information on the basic devices in the design, and (iii) a technology file containing the manufacturing constraints. Physical design is usually concluded by Layout Post Processing, in which amendments and additions to the chip layout are performed. This is followed by the Fabrication or Manufacturing Process where designs are transferred onto silicon dies which are then packaged into ICs.
Each of the phases mentioned above has design flows associated with them. These design flows lay down the process and guide-lines/framework for that phase. The physical design flow uses the technology libraries that are provided by the fabrication houses. These technology files provide information regarding the type of silicon wafer used, the standard-cells used, the layout rules (like DRC in VLSI), etc.
Typically, the IC physical design is categorized into full custom and semi-custom design.
Full-Custom: Designer has full flexibility on the layout design, no predefined cells are used.
Semi-Custom: Pre-designed library cells (preferably tested with DFM) are used, designer has flexibility in placement of the cells and routing.
One can use ASIC for Full Custom design and FPGA for Semi-Custom design flows. The reason being that one has the flexibility to design/modify design blocks from vendor provided libraries in ASIC.
Official source
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