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THE PCB DESIGN PROCESS
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Supplier Survey Once these facts are known, a survey of potential tool suppliers must be conducted. Basic elements include: 1. Determining how closely each tool candidate comes to meeting the need and its cost to acquire, set up, and maintain 2. Assessing the long-term viability of the supplier to ensure that the tool does not become an orphan should the supplier fail 3. Making a check with other users of the candidate tools to ensure that they perform as advertised
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14.4.3 Benchmarking Representative benchmark designs need to be made on each candidate system to assess how well they are done. Depending on the size of the potential sale and the size of the benchmark design, a vendor may do the benchmark free of charge. If not, one should be prepared to pay for this valuable step in the evaluation process. Only after completing all of these evaluation steps is it possible to make an informed selection. Doing less, such as relying on an outsider to recommend tools or taking a vendor s word for it, carries the risk of owning a tool that delays development or, worse, having to repeat the selection process in the middle of a project.
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14.4.4 Multiple Tools Knowing the wide variety of designs that may be encountered and the fact that virtually all CAD and CAE tools have been designed to be very good at some subset of design types, it is unrealistic to expect that a single set of tools from a single vendor will be able to deal with all problems equally well. A company with a wide range of design types, such as a company engaged in the design of computers and instrumentation, should expect to own more than one set of tools, each set optimized to its set of tasks. Trying to force one set of tools onto all types of problems is certain to result in overtooling simple designs and undertooling complex ones.
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INTERFACING CAE, CAD, AND CAM TOOLS TO EACH OTHER
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A major argument for buying all of the CAE, CAD, and CAM tools from a single vendor is to ensure that they all play together. In the past, this was a major concern because each vendor had proprietary data formats and there were no industry standard data formats. IPC, IEEE, and other trade associations have evolved standard forms of data interchange between systems. These have been adopted by suppliers, such that it is relatively easy to interface best-inclass tools from different vendors to each other.
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INPUTS TO THE DESIGN PROCESS
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Libraries Each CAE and CAD tool uses a series of libraries that contain information describing each component that may be used in a design. These range from a simple description of the physical size of the pads and their relative positions to a full logical model that can be exercised in a simulator. Libraries do not usually come as part of a system.They must be purchased separately or developed one part at a time by the user. Libraries in mature systems can be quite large and
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represent a substantial investment in time to develop them. Unfortunately, libraries are usually unique to a given tool and cannot be transferred easily should a new tool be chosen. 14.6.1.1 Pad Shapes and Physical Features. The most basic library used by a CAD system describes the physical characteristics of a part in a manner that allows the CAD system to create its mounting holes pattern and pads as well as its silk screen outline and solder mask pattern. This library entry will contain a pad stack that describes how large the component lead holes are and the size and shape of the pads that will appear in each type of PCB layer. For example, an outer layer pad will need to be large enough to ensure adequate annular ring, an antipad will be needed in a power plane to ensure that the plated-through-hole barrel does not touch the power plane, or a thermal pad will be necessary to make a connection to the plane in a manner that still allows reliable soldering. These library entries may contain the unique part numbers used by a company to build a bill of materials, in which case, the CAD system will be able to produce a bill of material in ready-to-use form. Some physical feature libraries also contain information about the nature of a pin, such as whether it is an input, output, or power pin. This data is used by the checking programs to ensure that the points in a net are ordered properly for high-speed performance or to ensure that a net has the correct kinds of pins in it. 14.6.1.2 Functional Models. CAE tools that simulate the operation of a PCB require a library of models that describe how each part operates logically. These are functional models. Functional models do not contain information about propagation delay or rise times needed to verify that timing rules are complied with. Functional models are often used to configure emulators. 14.6.1.3 Simulation Models. Simulation models are extended versions of functional models. They contain all the functional information as well as detailed information about path delays through a part and rise and fall times. They are used to ensure that worst-case timing conditions result in a properly operating design. 14.6.2 PCB Characteristics One of the sets of data required by the physical layout system is a description of the PCB or its physical characteristics. This includes its size, number and kinds of layers, thicknesses of insulating layers, copper thicknesses, and areas that are not available for parts or traces. 14.6.3 Spacing and Width Rules To ensure compliance with manufacturing and transmission line rules, the trace widths and trace spacings for each layer must be entered into the CAD system. This is typically done in tabular form. 14.6.4 Netlists Netlists describe to the CAD system how the pins of each device connect to each other. Systems that manage routing or layout to high-speed design rules will require netlists that contain instructions on how to handle each net, such as what impedance to use, what spacing to preserve with respect to neighbors, and whether terminations or special ordering is needed. 14.6.5 Parts Lists Parts lists tell the CAD system what type of library entry to use for each part in the design.
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