New Trends in CAD-CAM Data Conversion (2)

2.1 EDIF 4.0.0 extended application

2.1.1 Purpose and form

EDIF 4.0.0 is now an EDA standard, and many EDA developers such as Mentor and Candence have adopted it. Here, the extended application of the EDIF 4.0.0 standard is mainly intended to solve or at least improve some of the main problems of CAD in the PCB fabrication and assembly process, in particular, a method for converting information from a single entity (Entities) of a CAD workstation to a CAM workstation. technology. These problems in the design and manufacturing process involve: the calibration of Gerber data, the inconsistent data format, the wrong library call, the way to provide electronic data, etc., and finally solve the correctness, consistency and integrity of the data. This goal is very necessary, because the complexity of electronic design will inevitably lead to the emergence of multiple types of PCB multilayers, components, and the rapid transformation of production, emergency needs, and then the production control mechanism to meet user requirements , the greatest integration and other technologies.

Published by EIA (Electronic Industries Association), EDIF 4.0.0 is actually a new method of electronic design CAD modeling, which is a form of language description. This standard format extension is applied to the CAD output format, and the CAD/CAM interaction mode is established to facilitate communication between the designer and the producer and assembler.

2.1.2 Main content

The design method of the Activity Model in all ECCE projects uses IDEF0 (IDEF is the abbreviation of ICAM Definition, ICAM is Integrated Computer Aided Manufacturing). In the ECCE project, it refers to the production of PCBs, assembly of PCAs (circuit components, including PCB, Components, etc.) and MCMs (Multi-Chip Modules, multi-chip components), the specific point is:

Hey. Fabricating and testing PCB light panels;

Hey. Assemble components to the PCB light board;

Hey. Test the assembled board.

Because the manufacturing-oriented design can be divided into multiple activities, these activities need to have corresponding information transmission or feedback. Using EDIF 4.0.0 to establish IM (Information Model) can complete the transmission of the following information in the CAD phase:

Hey. Produce and test information on the light panel;

Hey. Assembling the information of the PCB light board;

Hey. For manufacturing related information;

Hey. Tips that can easily cause problems in the manufacturing stage.

The details of EDIF 4.0.0 are not explained here, you can check the relevant information.

The processing of related data (such as PCA/MCM, etc.) is verified by a variety of CAD, and EDIF 4.0.0 can describe a category that covers approximately 95% of CAD-CAM conversion information. The EDIF 4.0.0 standard ensures that relevant data information models are transmitted and validated and approved between different CADs. After some simplification and constraint processing, it will be the initial herb for CAM-IM development.

CAM-IM mainly has the following information content:

 assembled board;

 Layout subset;

Electric connection map;

Electrical connection layout hierarchy directory;

Design level catalog;

 design management;

 geometry description;

 document;

Hey. Graphic

 Make a geometric description of the PCB;

 material;

Package (insertion and placement);

 components, devices, components;

 technical information;

 logical relationship (function) description;

 pin and die (Die) description;

 wiring;

 test

 imposition;

 User-defined information.

There are other pieces of information that are not listed in detail.

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