Abstract-System-on-a-chip (SOC) platform manufacturers are increasingly adding configurable features that provide power and performance flexibility in order to increase a platform's applicability. This paper presents a framework, called Platune, for performance and power tuning of one such SOC platform. Platune is used to simulate an embedded application that is mapped onto the SOC platform and output performance and power metrics for any configuration of the SOC platform. Furthermore, Platune is used to automatically explore the large configuration space of such an SOC platform. The versatility, in terms of accuracy and speed of exploration, of Platune is demonstrated experimentally using three large benchmark examples. The power estimation techniques for processors, caches, memories, buses, and peripherals combined with the design space exploration algorithm deployed by Platune form a methodology for design of tuning frameworks for parameterized SOC platforms in general.Index Terms-Author, please supply your own keywords or send a blank e-mail to keywords@ieee.org to receive a list of suggested keywords.

Abstract-In this work, we provide a technique for efficiently exploring the power/performance design space of a parameterized system-on-a-chip (SOC) architecture to find all Pareto-optimal configurations. These Pareto-optimal configurations will represent the range of power and performance tradeoffs that are obtainable by adjusting parameter values for a fixed application that is mapped on the SOC architecture. Our approach extensively prunes the potentially large configuration space by taking advantage of parameter dependencies. We have successfully applied our technique to explore Pareto-optimal configurations of our SOC architecture for a number of applications.

This article describes the implementation and experimental results of a real-time carrier phase differential global positioning system (GPS) aided inertial navigation system (INS). The implementation is the result of a study to analyze the capabilities of such a system relative to the requirements of advanced vehicle control and safety systems (AVCSS) for intelligent transportation systems. Such navigation systems have many application possibilities (e.g., aviation and precision flight, automated mining, precision farming, dredging, satellite attitude control). Advantages and disadvantages of the GPS, INS, and differential GPS-aided INS approaches are discussed. The implementation achieves 100-Hz vehicle state estimates with position accuracies at the centimeter level through the use of differential carrier phase GPS techniques.

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