Multi-level logic optimization using binary decision diagrams

A multilevel logic optimizer, which is based on the transduction method, is introduced. The original transduction method is good for optimization, but its calculation time and storage area increase exponentially with the number of inputs because of the use of truth tables. To save CPU time and memory space, the authors implemented this algorithm using ordered binary decision diagrams (OBDD) as the data structure for representing logic functions. Since OBDD does not become as large as other representations, it can handle large circuits without partitioning.<>