By Timothy J. Barnes, David Harrison, A. Richard Newton, Rick L. Spickelmier (auth.)
When it involves frameworks, the widely used tale of the elephant and the six blind philosophers turns out to use. As every one philoso pher encountered a separate a part of the elephant, every one stated his thought of, yet improper judgement. One blind thinker felt a leg and idea it a tree. one other felt the tail and suggestion he held a rope. one other felt the elephant's flank and notion he stood ahead of a wall. we are alleged to know about snap decisions from this alle gory, yet its writer may well good were describing layout automation frameworks. For within the truth of contemporary product improvement requisites, a framework needs to be many stuff to many folks. xiv CAD Frameworks: Integration expertise for CAD because the authors of this ebook word, framework layout is an optimi zation challenge. one way or the other, it needs to be either a high-quality rope for one and a big tree for an additional. by some means it must offer a regular setting for exploiting the total power of computer-aided engineering instruments. And, someway, it has to make genuine such abstractions as interoperability and interchangeability. For years, we now have stated a framework as anything that offers application-oriented prone, simply as an working method presents system-level help. And for years, that straightforward assertion has concealed the large complexity of really delivering these services.
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DATA REPRESENTATION 43 Other models have been used to describe engineering data, most notably the relational, hierarchical, and network models. Recently, so called "object oriented" approaches have been proposed, where the entity-relationship model is implemented most closely. The issues relating to the use of such models for engineering data are presented in Chapter 4. 5 The Nature of Engineering Design Information Before a data model and associated implementation, complete with DOL and DML, can be evaluated for use in an engineering Framework, it is necessary to have a clear understanding of the nature of the information that must be represented and the requirements imposed by the users of the system, both tool and designer.
For example, if the interface putNet, contained subroutine calls named getNet, getGate, and putGate for storing and retrieving netlist infor- mation, but did not contain facilities for dealing with other data, it would be very difficult to use the system to store mask layout information. On the other hand, if the interface contained the calls getObject and putObject, where the particular meaning associated with a given type of object was not known to the database per se, then the system could be used to manage many different sorts of data and could be adapted easily to deal with new data as well.
Until quite recently, a tool developer could not assume much more than a relatively simple textual input/output device was available for communicating with the user, and all tools made the assumption that while they were running no other tool would be using the terminal. In the case of graphicsintensive applications, the CAD programs were generally optimized for specific graphics hardware which, again, "owned" the display. This led to a proliferation of unique, hard-wired interfaces for each tool and there has been very little sharing of userinterface facilities to date, beyond the use of common plotting libraries in some cases.