Synchronous Sequential Circuit Chapter 5 ●●●●● Analysis ●●●● ●●。●●
Synchronous Sequential Circuit Chapter 5 Analysis
●●●●● Analysis ●●●● ●●0 ●●● ●●●● Analyze existing circuits to determinel their function Synchronous sequential circuit o the basic modeling structure Two circuit models: Mealy model Moore model o Three approach used to describe the circuit: Logic function equation State table State diagram
Analysis Analyze existing circuits to determine their function ⚫ Synchronous sequential circuit ⚫ The basic modeling structure ⚫ Two circuit models: Mealy model & Moore model ⚫ Three approach used to describe the circuit: ⚫ Logic function equation ⚫ State table ⚫ State diagram
Universal model :99 System ●●● ●●●● Input Variables工 System Combinational output ogIC Variables State Excitation Variables Variables 0 Memory Fli flops E CLOCK
Universal model System output Variables O0 Om Er Excitation Variables E0 Combinational logic System Input Variables I0 In S0 Sx State Variables Memory Flipflops CLOCK
●●●●● Analysis principle : gpo ●●●● Determine the system variables: input, state and output o Assign names to the variables if they are not clear from the logic diagram Determine the flip-flop type. Write the characteristics equations Write the excitation equations by inspection from the logic diagram Write the output variable equations Determine whether the circuit is a Mealy or a Moore machine
Analysis principle ⚫ Determine the system variables: input, state and output. ⚫ Assign names to the variables if they are not clear from the logic diagram. ⚫ Determine the flip-flop type. Write the characteristics equations. ⚫ Write the excitation equations by inspection from the logic diagram. ⚫ Write the output variable equations. Determine whether the circuit is a Mealy or a Moore machine
●●●●● Analysis principle。 ●●● ●●●● o Mealy model machine E=f(工,St St+1=f(St, E)flip-flop characteristics equation .0=9(I, St) ● Moore mode| machine E=f(工,St) St+1= f( St, E) flip-flop characteristics equation O=g(5+)
Analysis principle ⚫ Mealy model machine ⚫ E = f( I, St ) ⚫ St+1 = f( St, E ) flip-flop characteristics equation ⚫ O = g( I, St ) ⚫ Moore model machine ⚫ E = f( I, St ) ⚫ St+1 = f( St, E ) flip-flop characteristics equation ⚫ O = g(St )