课件：数字逻辑7-5

1、 Design with function unitChapter 7Finite state machine designStep 1: set up enough state with different meaning ;State name state meaningIDLE all lights are off ; L1 one left light is on; L2 two left lights are on; L3 three left lights are on;R1 one rignt light is on; R2 two right lights are on; R3

2、 three right lights are on;LR3 all lights are on ; Examples : T-bird tail lights control Step 1: set up enough state with different meaning ;Examples : T-bird tail lights control Step 2-3: from state diagram to the transition listExamples : T-bird tail lights control Step 4: from the state diagram t

3、o the transition tableExamples : T-bird tail lights control Step 5: get the excite equations for D flip-flopExamples : T-bird tail lights control State machine decomposingLarge state machine may be decomposed to a collection of smaller state machine, or even decomposed to combinational blocks and me

4、mory blocks.State machine decomposingTwo conditions for Z=1 : (A=last_A) or (B=1 and last_Z=1 )Example: the simple state machineState machine decomposingSubmachine design :Decomposing state machine Main machine design : Examples : T-bird tail lights control Examples : T-bird tail lights control Examples : T-bird tail lights control Examples : Vending machine Basic unit：Mode 2 counter Binary counterCan not control ?Which is the final state ?Control and final stateA