Encontrados 11 documentos, a visualizar página 1 de 2
Computational Structures for Image Processing in Tomography
António Rui de Oliveira e Silva Borges; António Ferrari de AlmeidaThis work describes the design of a parallel computing system, MIMD type, suited for image reconstruction in X-ray transmission tomography and single phnlon emission tomography. The main requirement was to accomplish a good price/performance trade-off. So that strorig cost reductions might be possible. (...)Keywords: tomographic reconstruction; convolution algorithms; multiprocessing; MIMD topologies;...
Síntese de Circuitos Conformes com o Standard Boundary Scan
Ana Antunes; Meryem Marzouki; António FerrariThis paper presents a tool that allows the inclusion of the Boundary Scan test logic in a VHDL description of a given integrated circuit. ; Este artigo apresenta uma ferramenta que permite a inclusão de facilidades de teste ao nível da descrição VHDL de um circuito integrado. A lógica de teste incluida respeita o standard Boundary Scan.
Geração de Vectores de Teste por Emparelhamento
Fernando Morgado Dias; Mohamed Hedi Touati; Meryem Marzouki; António FerrariThis paper presents a method to generate test vectors for an electronic board composed of modules from which the structural description it’s not known.The only information available is the set of test vectors, their coverage on the primary inputs and outputs of each module provided by the manufacturer and the composition of the board.This method provides test vectors to test the board from its primary inp...
Uma Introdução aos Processadores de Arquitectura Configurável
Orlando Moreira; Nuno Lau; António FerrariConfigurable Architecture Processors are computational systems where programmable logic is inserted within the architecture of a traditional microprocessor core in order to combine the versatility of software and the high performance of hardware. This paper gives an overview of this kind of systems, discussing implementation factors and showing examples of proposed architectures. ;...
Um Simulador para o Processador de Arquitectura Configurável ConCISe
Orlando Moreira; Bernardo Kastrup; Nuno Lau; António FerrariConCise is a Philips research project on Configurable Architecture Processors, which is expected to make this kind of systems cost-effective for large scale production in the near future. This article starts by presenting the ConCISe architecture. Then it describes the development of a simulator for a ConCISe processor and discusses some of the simulation results. The analysis of t...
HiParaGraphs, uma Linguagem de Especificação de Algoritmos de Controlo Paralelo...
Andreia Melo; Valery Sklyarov; António FerrariThis paper presents a specification method for describing the behavior of digital control units. It is a formal language that results from an evolution of its predecessor, the HGSs – Hierarchical Graph-Schemes. It is called HiParaGraphs – Hierarchical and Parallel Graphs, and the main objective was to add new facilities, mainly related to parallelism. ; Este artigo apr...
EaSys: Uma Linguagem Orientada por Objectos para Descrição de Sistemas Digitais
Arnaldo Oliveira; Valery Sklyarov; António FerrariThis paper discusses the use of object-oriented programming languages in the design of digital systems. The ideas presented here are particularly useful to develop complex systems composed of hardware and software components. The EaSys language described in this paper was developed to allow the use of a single language in the entire design flow. This language is an extension to the...
Especificação e Simulação Interactiva de Algoritmos de Controlo Paralelos e Hie...
Andreia Melo; Valery Sklyarov; António FerrariThe specification method, which is presented in this paper, is used to describe the behavior of a digital control unit. The control algorithms that manage this unit may be hierarchical, parallel and both. In this paper is shown the specification and simulation of hierarchical and parallel control algorithms at the same time. The CAN - Controller Area Network protocol was used as a ...
Synthesis and simulation of reprogrammable control units from hierarchical spec...
António Manuel Adrego da Rocha; Valery Skyarov; António FerrariFinite state machines (FSM) have been a topic of great importance in the last five decades and have been used ti specify and implement control units. Due to the increasing complexity of control units and since the FSM model does not explicitly support hierarchy and concurrency, new state-based models with hieararchical and concurrent constructions were proposed in order to overcome the limitations of convention...
LASER DE Nd:YLF PARA APLICAÇÕES EM LIDAR
Marco Antonio FerrariThe use of diode pumped, solid state lasers has caused increasing interest due its high efficiency, compactness and possibility of operation in high peak powers. The goal of this work was the study of configurations of laser resonators that allow to obtain Q-switched pulses and a future frequency doubling, for LIDAR (Light Detection and Ranging) applications. Using as active medium Nd:YLF crystals grown by the ...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||