By Ambar Sarkar, Ronald Waxman, James P. Cohoon (auth.), Jean-Michel Bergé, Oz Levia, Jacques Rouillard (eds.)
Models in method layout keep on with the final tendency in electronics by way of dimension, complexity and hassle of upkeep. whereas a version might be a possible illustration of a approach, this expanding complexity occasionally forces present CAD-tool designers and version writers to use modeling options to the version itself. version writers have an interest in instrumenting their version, with a view to extract severe info ahead of the version is whole. CAD instruments designers use inner representations of the layout at quite a few levels. The complexity has additionally led CAD-tool builders to improve formal instruments, theories and strategies to enhance relevance, completeness and consistency of these inner representations. details modeling consists of the illustration of gadgets, their houses and relationships.
Performance Modeling
by way of layout offerings and trade-offs, functionality is usually the ultimate key. notwithstanding functionality estimations need to be extracted at a truly early level within the process layout. functionality modeling matters the set of instruments and strategies that let or aid the fashion designer to trap metrics in relation to destiny architectures. functionality modeling encompasses the total procedure, together with software program modeling. It has a robust impression on all degrees of layout offerings, from hardware/software partitioning to the ultimate format.
Information Modeling
Specification and formalism have some time past frequently performed little half within the layout and improvement of EDA platforms, their help environments, languages and techniques. as an alternative, EDA procedure builders and EDA approach clients have looked to be content material to function inside of environments which are usually tremendous complicated and will be poorly validated and understood. this example has now started to alter with the expanding use of thoughts drawn from the domain names of formal specification and database layout. This component to this quantity addresses features of the concepts getting used. particularly, it considers a particular formalism, referred to as details modeling, which has received expanding attractiveness lately and is now a key a part of a few of the proposals within the EDA criteria Roadmap, which offers to be of value to the EDA undefined. moreover, the part appears to be like at an instance of a layout approach from the viewpoint of its underlying realizing of the layout strategy instead of via a attention of specific CAD algorithms.
Meta-Modeling: functionality and knowledge Modeling includes papers describing the very newest strategies utilized in meta-modeling. will probably be a necessary textual content for researchers, practitioners and scholars enthusiastic about digital layout Automation.
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Additional resources for Meta-Modeling: Performance and Information Modeling
Example text
The token-ring is a suitable test-bed for the application of our methodology for three important reasons. First, the token-ring represents a typical reactive system. Since our methodology concerns the design of reactive systems, the choice of token-ring network design problem for methodology application is appropriate. Second, the token-ring design problem retains much of its complexity even at a high level of abstraction. The design-problems uncovered by the application of our methodology to the high-level descriptions of the token-ring were therefore complex and nontrivial.
For more details, please see [Sar95]. The application of our integrated-simulation based methodology generated several interesting results. In the following subsections, we first briefly describe the IEEE token ring. We then describe a few examples of how we detected inconsistencies between Statecharts and ADEPT models and obtained early performance estimates and resource bounds of the system that would not have been convenient to obtain otherwise. These examples demonstrate the effectiveness of our integrated simulation methodology for nontrivial design problems.
In Figure 18 (a), the relevant portion of the Statecharts is presented. Suppose the station is in WAIT state and an event TOKEN_READY occurs, indicating the arrival of a token. If, at this point, the token is error-free and ready to transmit data, the station will enter the CHECK_ERROR state. An entry to the state CHECK_FREE occurs next. In CHECK_FREE state, the station checks if there is data available to be sent with the token. The need to send is determined by the condition [in (NEED_TO_SEND) 1, which should be true if there is data waiting to be sent across the ring from this station.