Electronic Design Tools- Models

 

Xmultiple's Engineering Department


Electronic Design Automation - EDA

EDA Program with integrated Schematic Capture, PCB layout and 3D modelling
Electronic design automation (EDA or ECAD) is a category of software tools for designing electronic systems such as printed circuit boards and integrated circuits. The tools work together in a design flow that chip designers use to design and analyze entire semiconductor chips

EDA specifically with respect to integrated circuits.

Current digital flows are extremely modular (see Integrated circuit design, Design closure, and Design flow (EDA)). The front ends produce standardized design descriptions that compile into invocations of "cells,", without regard to the cell technology. Cells implement logic or other electronic functions using a particular integrated circuit technology. Fabricators generally provide libraries of components for their production processes, with simulation models that fit standard simulation tools. Analog EDA tools are far less modular, since many more functions are required, they interact more strongly, and the components are (in general) less ideal.

EDA for electronics has rapidly increased in importance with the continuous scaling of semiconductor technology. Some users are foundry operators, who operate the semiconductor fabrication facilities, or "fabs", and design-service companies who use EDA software to evaluate an incoming design for manufacturing readiness. EDA tools are also used for programming design functionality into FPGAs.

Design

1. High-level synthesis(syn. behavioural synthesis, algorithmic synthesis) For digital chips

2. Logic synthesis translation of abstract, logical language such as Verilog or VHDL into a discrete netlist of logic-gates.

3. Schematic Capture For standard cell digital, analog, rf like Capture CIS in Orcad by CADENCE and ISIS in Proteus.

4. Layout like Layout in Orcad by Cadence, ARES in Proteus.

Simulation

1. Transistor simulation V low-level transistor-simulation of a schematic/layout's behavior, accurate at device-level.

2. Logic simulation V digital-simulation of an RTL or gate-netlist's digital (boolean 0/1) behavior, accurate at boolean-level.

3. Behavioral Simulation V high-level simulation of a design's architectural operation, accurate at cycle-level or interface-level.

4. Hardware emulation V Use of special purpose hardware to emulate the logic of a proposed design. Can sometimes be plugged into a system in place of a yet-to-be-built chip; this is called in-circuit emulation.

5. Technology CAD simulate and analyze the underlying process technology. Electrical properties of devices are derived directly from device physics.

6. Electromagnetic field solvers, or just field solvers, solve Maxwell's equations directly for cases of interest in IC and PCB design. They are known for being slower but more accurate than the layout extraction above.

Analysis and Verification

1. Functional verification

2. Clock Domain Crossing Verification (CDC check): Similar to linting, but these checks/tools specialize in detecting and reporting potential issues like data loss, meta-stability due to use of multiple clock domains in the design.

3. Formal verification, also model checking: Attempts to prove, by mathematical methods, that the system has certain desired properties, and that certain undesired effects (such as deadlock) cannot occur.

4. Equivalence checking: algorithmic comparison between a chip's RTL-description and synthesized gate-netlist, to ensure functional equivalence at the logical level.

5. Static timing analysis: Analysis of the timing of a circuit in an input-independent manner, hence finding a worst case over all possible inputs.

6. Physical verification, PV: checking if a design is physically manufacturable, and that the resulting chips will not have any function-preventing physical defects, and will meet original specifications.

Manufacturing Preparation

1. Mask data preparation, MDP: generation of actual lithography photomask used to physically manufacture the chip. Resolution enhancement techniques, RET V methods of increasing of quality of final photomask.

2. Optical proximity correction, OPC V up-front compensation for diffraction and interference effects occurring later when chip is manufactured using this mask.

3. Mask generation V generation of flat mask image from hierarchical design.

4. Automatic test pattern generation, ATPG V generates pattern-data to systematically exercise as many logic-gates, and other components, as possible.

5. Built-in self-test, or BIST V installs self-contained test-controllers to automatically test a logic (or memory) structure in the design.

 

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