TAILIEUCHUNG - Model-Based Design for Embedded Systems- Part 11

Model-Based Design for Embedded Systems- P12: This book contains information obtained from authentic and highly regarded sources. Reasonable efforts have been made to publish reliable data and information, but the author and publisher cannot assume responsibility for the validity of all materials or the consequences of their use. | 76 Model-Based Design for Embedded Systems Having determined a response time interval across the SC for each task the second phase of the global system analysis is performed as usual describing the traffic timing behavior at task outputs by using event models. Afterward the calculated output event models are propagated to the connected components where they are used as activating event models for the subsequent global iteration. If after an iteration all calculated output event models remain unmodified convergence is reached. As the propagated event models contain all potential event timings during and after the transition the calculated task response times are considered valid. Sensitivity Analysis As a result of an intensive HW SW component reuse in the design of embedded systems there is a need for analysis methods that besides validating the performance of a system configuration are able to predict the evolution of the system performance in the context of modifications of component properties. The system properties represent intrinsic system characteristics determined by the configuration of the system components and the system s interaction with the environment. These include the execution communication time intervals of the computational communication tasks the timing parameters of the task activation models or the speed factor of the HW resources. These properties are used to build the performance model of the system. Based on this the system quality is evaluated using a set of performance metrics such as response times path latencies event timings at components outputs and buffer sizes. These are used to validate the set of performance constraints determined by local and global deadlines jitter and buffering constraints and so on. The sensitivity analysis of real-time systems investigates the effects on the system quality . end-to-end delays buffer sizes and energy consumption when subjected to system property variations. It will in the following be

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