Question

4) (3 points) You are asked to design a finite state machine (FSM) to control the tail-light of a 1965 Ford Thunderbird automobile. There are three lights on each side: i) Left: LA, LB, LC; ii) Right: RA, RB, RC. Corresponding to a Left (L) or a Right (R) turn signal, the flashing sequence is as shown in the figure below. [For example, when the left turn signal is activated, all the lights are off, then LA turns on, then LA and LB turn on, then all three of LA, LB, LC turn on, then they all turn off, and the sequence repeats). There is also a Hazard (H) signal which operates the lights in Hazard mode - in this mode, ALL the lights are continuously flashing. Assume a free-running clock whose frequency equals the desired flashing rate for the lights. Design the above state machine. Just draw the state transition graph. No need to synthesize/generate a circuit. Clearly state the inputs and outputs of your system. Is yours a Mealy or a Moore machine? To simplify your machine, you can make the following assumptions: once a flashing sequence begins, it always completes. A right turn (R) signal will never be asserted while the left turn signal is flashing; and vice-versa. LCLB LA RA RB RC OOO OOO ooeeoo o @ @ O 0 0 = Light ON = Light OFF

Answer 1

Following is the state transition graph .In this it is a Moore machine. The reason for the same is that in Moore machine, output depends only on the current state. And here too its output is depending on its current state.

HA? HAZ! HA2 LE F7.HA 2"RIGHT" HAZ +LFF1. RIGHT RIGHT #HAZ)' HA RIG17. HA 2': LEFT' y (RI HA 2! HARI "HAZ HA2 L R2 state che ijnment ! state IDLE 니 Oo-- Ob--0-- Oo LR3 oo IDLE Transition list QO I Transition we pression S4 1924 o Cleft + RIGHT + H92)'| ZOLE O LEFT · H02'. RIGHT! HAIZ + LE,F1 'R7GH7 R7GH7 HAZ' LEFT' IDLE IDLE IOLE Hnz' HAZ HARI 14А 2. o oo ooooo------ OO --0-0-0--- 9-9--0000-0oooo HA2' HAZ R2 HAR R2 HAZ -Oo LR 3 Scanned with CamScanner