On the synthesis of MVMT functions for PLA implementation using CCDs

Abstract

A new programmable logic array (PLA) for implementation of multivalued multithreshold (MVMT) functions using charge-coupled-device (CCD) technology is introduced. It is shown that the number of functions realized using the proposed structure is larger than those realized using the authors' previously reported PLA structure. For example, all 256 four-valued three-threshold functions can be synthesized using only one column of the proposed PLA, as compared with two columns if the existing structure is used. This increase in functionality is achieved through increasing the number of gates per column from 8 to 12. The new structure exhibits the desirable feature of being dynamically reprogrammable at the user level by controlling the thresholds of the gates used. A synthesis procedure which can be used to synthesize MVMT functions for implementation using the proposed PLA is given.<>