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4. Sequence Detector Suppose we want to design a sequential machine with one input and one output. The output system receives 4 or more consecutive I's. A typical output sequence is shown below. - 1 whenever the Input 10 Output 0 1 1 0 000 (a) Draw the state diagram and show a state assignment for a Mealy machine (b) Draw the state diagram and show a state assignment for a Moore machine (e) Briefly discuss what are the pros / cons of Mealy and Moore machines

Answer 1

4. Sequence detectos @ Mealy Machine Come lo are As there 4 states, there are a Bits for representation To azoo b=ol - NS Ilpo tle= aloo loo lo Calo - da li - -

(6) Moore Machine Here it requires 5 states, so there are 3 Bits NS PS a=000 11020 Elea 00 O 001 000010 010 ooo loll OOOOO 100 000 100 doo!! erloo Moore type function of present * Olps are state & Olps are independent of Ilpo ol Mealy type Joe Olfs are function of present state and present ilp A Input changes may effect the I ole of circuit. a state diagram includes an Ils and Olp values for each transition bw two states Requiry lem no. of states x state diagram include an olp value for each state * Require more no. of states to implement same function & Z(t) = x (s(t)) * 2(t) = x (S(4), 2(t))