The goal of this paper is to promote application of logic synthesis methods and tools in different tasks of modern digital designing. The paper discusses functional decomposition methods, which are currently being investigated, with special attention to balanced decomposition. Since technological and computer experiments with application of these methods produce promising results, this kind of logic synthesis will probably dominate the development of digital circuits for FPGA structures. Many examples confirming effectiveness of decomposition method in technology mapping in digital circuits design for cryptography and DSP applications are presented.