A circuit constructed in accordance with this invention includes means for asynchronously forcing a flip-flop (70) or a register to a programmable logical state in response to an initialization input signal (I). In one embodiment, a D-type flip-flop (70) is provided having data input terminal (71), a...http://www.google.com.hk/patents/US4684826?utm_source=gb-gplus-share專利 US4684826 - Programmable asynchronous register initialization circuit
