analysis examples

analysis examples - CSE 261 Sequential Logic Circuit...

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CSE 261 Sequential Logic Circuit Analysis 1 Detailed Analysis of State Machines 1. Find flip-flop input excitation equations , D = f1 (state, inputs) 2. Substitute excitation equations into flip-flop characteristic equations, giving transition equations , Q* = f2 (state, inputs) 3. Find output equations , OUT = g (state) or g (state, inputs) 4. Construct a transition/output table from these equations 5. Name states in this table to construct state/output table 6. Draw a state diagram from state/output table
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CSE 261 Sequential Logic Circuit Analysis 2 Exercise 1. A sequential logic schematic diagram has been given to you as following. J Q K A B CLK 1. Find flip-flop input excitation equations: J1= K1= 2. Substitute excitation equations into flip-flop characteristic equations, giving transition equations, Q* = f2 (state, inputs) Latch and flip-flop characteristic equations: D latch : Q*=D S-R latch/flip-flop : Q*=S+R’.Q J-K flip-flop : Q*=J.Q’+K’.Q T flip-flop : Q*=Q’ or with enable Q*=EN.Q’+EN’.Q Q1*= 3.
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