  With the progressive scale-down of semiconductor's feature size, people are
looking forward to More Moore and More than Moore. In order to offer a possible
alternative implementation process, people are trying to figure out a feasible
transfer from silicon to molecular computing. Such transfer lies on bio-based
modules programming with computer-like logic, aiming at realizing the Turing
machine. To accomplish this, the DNA-based combinational logic is inevitably
the first step we have taken care of. This timely overview paper introduces
combinational logic synthesized in DNA computing from both analog and digital
perspectives separately. State-of-the-art research progress is summarized for
interested readers to quick understand DNA computing, initiate discussion on
existing techniques and inspire innovation solutions. We hope this paper can
pave the way for the future DNA computing synthesis.
