METHOD AND VLSI CIRCUITS ALLOWING TO CHANGE DYNAMICALLY THE LOGICAL BEHAVIOUR

摘要

A method, named the product terms method that allows to implementand/or to change dynamically the logical behaviour of any combinational orsynchronous sequential circuits has been presented. The method uses for everyproduct term of logical equations, expressed as a sum-of -product, threememory words: mask word, product word and function word. The words of allproduct terms are ranged in a table, which characterize the logical behaviourofthe circuit.The invention provides the hardware structure of several new types ofVSLI circuits, having re-configurable logic behaviours. A first embodimentimplements any type of multiple output combinational circuit, a secondembodiment implements any synchronous sequential circuit with only clock inputand, a third embodiment implements any synchronous sequential circuits withdata inputs and clock input.An expert system capable to generate the tables used for the productterms method by interpreting and analysing the logical equations eithersuppliedby the user or found in a database is also provided.