  Many universal reversible libraries that contain more than one gate type have
been proposed in the literature. Practical implementation of reversible
circuits is much easier if a single gate type is used in the circuit
construction. This paper proposes a reversible n-bit gate that is universal for
reversible circuits synthesis. The proposed gate is extendable according to the
size of the circuit. The paper shows that the size of the synthesized circuits
using the proposed gate is comparable with the size of the synthesized circuits
using the hybrid reversible libraries for 3-in/out reversible circuits.
