同海大学 TONGJI UNIVERSITY X1X2 X1X2 00 01 11 10 00 01 1 10 0 0 0 0 0 0 0 0 0 0 (a)Transition table (b)Map for output Y=xx2+xiy Z=x1xy X2 (c)Logic diagram Fig.9-5 Derivation of a Circuit Specified by the Flow Table of Fig.9-4(b) 2002 Prentice Hall.Inc. M.Morris Mano DIGITAL DESIGN,3e
同©大学 TONGJI UNIVERSITY ● o Represent the states with alphabets
⚫Represent the states with alphabets
同榜大学 TONGJI UNIVERSITY Circuit instability (cycles) oWhen the state transition takes all the time, the circuit will not fall in one stable state, we call the circuit is not stable
Circuit instability (cycles) ⚫When the state transition takes all the time, the circuit will not fall in one stable state, we call the circuit is not stable
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
同桥大学 TONGJI UNIVERSITY (a)Logic diagram X1x2 00 01 10 0 0 0 0 0 (b)Transition table Fig.9-9 Example of an Unstable Circuit 2002 Prentice Hall,Inc. M.Morris Mano DIGITAL DESIGN,3e