Based on final
selections, designers can complete the routing work for
custom ALU manually or by CAD tools. Compared to
existing work, our proposed methodology is different in the
following ways: (1) it does not only include conventional N
type but also other dynamic circuits and therefore it has
greater potential for power reduction; (2) it achieves
convenient port-to-port replacement with similar layout area;
(3) it can be extended easily to cover a wide range of circuit
logic, such as static CMOS, pass-gate, transmission-gate, and
tri-state gate.