Optimization ofthe Addressing Scheme in Compositional Microprogram Control Unit with Code Sharing

Abstract

A method for reducing the hardware amount in the scheme of compositional microprogram control units (CMCU) with code sharing is proposed oriented to FPGA technology. The method is based on the use of three sources for encoding of pseudoequivalent OLC classes,and a multiplexer, which allows choosing one of these sources. Such an approach would reduce the number of LUT elements in the addressing circuit of CMCU. Application of the specified method to the finite state machine of addressing CMCU, under its implementation with FPGA, leads to reduction of the number of LUT-elements in the circuit of the control unit. Results of the research of the developed structures are represented, allowing defining their efficiency and the area of optimum application. An example of the proposed method application is given.