A coarse-grained dynamically reconfigurable MAC processor for power-sensitive multi-standard devices

DRMP, a Dynamically Reconfigurable MAC Processor, is an innovative, dynamically reconfigurable System-on-Chip architecture. The architecture exploits substantial overlaps in the functionality of different wireless MAC layers. Its flexibility is specialized for addressing the requirements of the MAC layer of wireless standards. It is targeted at consumer, multi-standard, handheld devices, and its design is meant to address the balance of flexibility and power-efficiency that this target market demands. The DRMP reconfigures packet-by-packet on the fly, allowing execution of concurrent protocol modes on a single hardware co-processor. An interrupt-driven programming model has also been presented and shown to implement the protocol state-machine of the three protocols on a CPU. These features will allow the DRMP to replace three MAC processors in a hand-held device. The most innovative component of the DRMP architecture is its Interface and Reconfiguration Controller. It uses a combination of asynchronous controllers to dynamically reconfigure the functional units in the architecture and delegate MAC tasks to them. The architecture has been modeled in Simulink at cycle-approximate abstraction. Results of simulations involving transmission and reception of packets have been presented, showing that the platform concurrently handles three protocol streams, reconfigures dynamically, yet meets and exceeds the protocol timing constraints, all at a moderate frequency. Its heterogeneous and coarse-grained functional units, limited connectivity requirements between these units, and proportionally large time that these resources are idle, promise a very modest power-consumption, suitable for mobile devices, while offering flexibility to implement different MAC protocols

Reactive processing for synchronous languages and its worst case reaction time analysis

Many embedded systems belong to the class of reactive systems. These are systems that have to react continuously to the environment at a rate that is determined by the environment. Reactive systems have two specific characteristics : their control flow requires concurrency and preemption, and, since the reactive systems are often safety-critical, we must be able to prove the correctness of the behavior and of the timing. To implement reactive systems, the synchronous languages were developed, which have a clear mathematical semantics and allow the expression of concurrency and preemption in a deterministic way. Programs in a synchronous language can be either compiled to software and run on a common processor, they can be synthesized to a hardware description, or a software/hardware co-design approach can be taken. However, the compilation of synchronous hardware into efficient code is not trivial. To improve the efficiency of the execution and at the same time simplify the compilation, reactive processors were introduced, which have an instruction set architecture that is inspired by synchronous languages. In particular, reactive processors have direct support for preemption and concurrency. Furthermore, these processors optimize the worst case reaction time, in contrast to common processors which optimize the average case reaction time. This simplifies the timing analysis, which is necessary to prove that a system meets its timing requirements. This thesis presents three contributions to reactive systems: - A formal semantics is given to the Kiel Esterel Processor (KEP), a reactive processor to execute the synchronous language Esterel. Also a compilation scheme from SyncCharts to the KEP assembler is presented, in addition to the existing compilation from Esterel into KEP assembler. - The Kiel Lustre Processor is introduced, a reactive processor for the synchronous dataflow language Lustre, which allows true parallel execution with multiple processing units. - Different approaches for the worst case reaction time analysis of KEP programs are presented: a search for the longest execution path in the KEP assembler, a formal modeling of the execution times based on interface algebras. Also an approach to use model checking to analyze the reaction time is applied to the KEP

Digital System Design - Use of Microcontroller

Embedded systems are today, widely deployed in just about every piece of machinery from toasters to spacecraft. Embedded system designers face many challenges. They are asked to produce increasingly complex systems using the latest technologies, but these technologies are changing faster than ever. They are asked to produce better quality designs with a shorter time-to-market. They are asked to implement increasingly complex functionality but more importantly to satisfy numerous other constraints. To achieve the current goals of design, the designer must be aware with such design constraints and more importantly, the factors that have a direct effect on them.One of the challenges facing embedded system designers is the selection of the optimum processor for the application in hand; single-purpose, general-purpose or application specific. Microcontrollers are one member of the family of the application specific processors.The book concentrates on the use of microcontroller as the embedded system?s processor, and how to use it in many embedded system applications. The book covers both the hardware and software aspects needed to design using microcontroller.The book is ideal for undergraduate students and also the engineers that are working in the field of digital system design.Contents• Preface;• Process design metrics;• A systems approach to digital system design;• Introduction to microcontrollers and microprocessors;• Instructions and Instruction sets;• Machine language and assembly language;• System memory; Timers, counters and watchdog timer;• Interfacing to local devices / peripherals;• Analogue data and the analogue I/O subsystem;• Multiprocessor communications;• Serial Communications and Network-based interfaces

Digital System Design - Use of Microcontroller

Embedded systems are today, widely deployed in just about every piece of machinery from toasters to spacecraft. Embedded system designers face many challenges. They are asked to produce increasingly complex systems using the latest technologies, but these technologies are changing faster than ever. They are asked to produce better quality designs with a shorter time-to-market. They are asked to implement increasingly complex functionality but more importantly to satisfy numerous other constraints. To achieve the current goals of design, the designer must be aware with such design constraints and more importantly, the factors that have a direct effect on them.One of the challenges facing embedded system designers is the selection of the optimum processor for the application in hand; single-purpose, general-purpose or application specific. Microcontrollers are one member of the family of the application specific processors.The book concentrates on the use of microcontroller as the embedded system?s processor, and how to use it in many embedded system applications. The book covers both the hardware and software aspects needed to design using microcontroller.The book is ideal for undergraduate students and also the engineers that are working in the field of digital system design.Contents• Preface;• Process design metrics;• A systems approach to digital system design;• Introduction to microcontrollers and microprocessors;• Instructions and Instruction sets;• Machine language and assembly language;• System memory; Timers, counters and watchdog timer;• Interfacing to local devices / peripherals;• Analogue data and the analogue I/O subsystem;• Multiprocessor communications;• Serial Communications and Network-based interfaces