Abstract: A decoding circuit is disclosed, which relates to a technology for changing a decoding structure without changing a circuit structure. A decoding circuit for decoding N input signals to generate output signals corresponding to elements of 2N binary information includes: a controller configured to generate control signals; a decoding unit configured to generate output signals by decoding the N input signals, wherein the number of output signals is controlled in response to the control signals; and a combination unit configured to output a first output signal by logically combining the output signals of the decoding unit.