同桥大学 TONGJI UNIVERSITY 0 0 y1y2 y1y2 y1y2 00 00 2 00 00 01 00 00 01 01 11 01 11 01 11 10 11 11 11 10 10 10 10 10 10 01 (a)State transition: (b)State transition: (c)Unstable 00→01→11→10 00→01→11 )01→11→10 Fig.9-8 Examples of Cycles 2002 Prentice Hall.Inc. M.Morris Mano DIGITAL DESIGN,3e