电子科技大学“数字逻辑设计及应用”数字逻辑7-5.pptVIP

* * Design with function unit Chapter 7 Finite state machine design Step 1: set up enough state with different meaning ; State name state meaning IDLE 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 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 list Examples : T-bird tail lights control Step 4: from the state diagram to the transition table Examples : T-bird tail lights control Step 5: get the excite equations for D flip-flop Examples : T-bird tail lights control State machine decomposing Large state machine may be decomposed to a collection of smaller state machine, or even decomposed to combinational blocks and memory blocks. State machine decomposing Two conditions for Z=1 : (A=last_A) or (B=1 and last_Z=1 ) Example: the simple state machine State machine decomposing Submachine 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 counter Can not control ? Which is the final state ? Control and final state Ascending up Descending down Binary counter Up/down counter Binary counter Mode N*M counter Binary counter