Method and VLSI circuits allowing to change dynamically the logical behaviour

摘要

A method, named the product terms method that allows to implement and/or to change dynamically the logical behaviour of any combinational or synchronous sequential circuits has been presented. The method uses for every product term of logical equations, expressed as a sum-of-product, three memory words: mask word, product word and function word. The words of all product terms are ranged in a table, which characterize the logical behaviour of the circuit. ;The invention provides the hardware structure of several new types of VSLI circuits, having re-configurable logic behaviours. A first embodiment implements any type of multiple output combinational circuit, a second embodiment implements any synchronous sequential circuit with only clock input and, a third embodiment implements any synchronous sequential circuit s with data inputs and clock input. ;An expert system capable to generate the tables used for the product terms method by interpreting and analysing the logical equations either supplied by the user or found in a database is also provided.