input/output structures and method for implementing a bi-directional data busses. China 200910127224.8 Chuang, Patrick; & Haig, Robert; & Kwon, Kookhwan; & Tseng, Chih 13-Feb-09 An efficient method for implementing programmable impedance output drivers and programmable input on die termination on a bi- directional data bus EPO 09250396.0 Chuang, Patrick; & Haig, Robert; & Kwon, Kookhwan; & Tseng, Chih