Especificação, projecto e implementação de circuitos de controlo virtuais

Abstract

This paper describes specification, design and implementation techniques of virtual control circuits. Likethe ordinary control circuits, they are usually implemented using Finite State Machines (FSMs). However, through reconfiguration, these circuits use the same hardware to implement different parts of a control algorithm. The adopted specification method is based on Hierarchical Graph-Schemes (HGSs) with some extensions proposed by the authors. Due to the architecture of the base device used, the one-hot state encoding technique is the most appropriate.In some applications, the reconfiguration should be done without stop the operation of the circuit, which implies the use of dynamically reconfigurable devices. The described implementations use a Xilinx XC6216 dynamically reconfigurable FPGA. An optimized architecture toimplement reconfigurable control units in VLSI is proposed.