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Chapter 1: Q42E (page 2)

Question: Write down the next-state and output-function tables for the traffic light controller described in Exercise B.41.

Short Answer

Expert verified

Answer

The truth table for the next-state and output-function table for the traffic light is given below:

Timer

Present State

Next State

Output

0

Red

Red

00

1

Yellow

Green

01

0

Yellow

Green

01

1

Red

Yellow

10

0

Green

Yellow

10

1

Yellow

Red

00

Step by step solution

01

Analyzing how state changes in the traffic light controller

The state S0 is for red traffic light. The state S1 is for yellow traffic light. The state S2 is for green traffic light. The red light is 00, yellow light is 01, and green light is 10. At starting the signal is red, when signal is sent, the yellow light gets on. The light stays the same until another signal is sent. On signal, the green light gets on.

02

Truth table for next and output function for the traffic light controller

The truth table for the next-state and output-function table for the traffic light is given below:

Timer

Present State

Next State

Output

0

Red

Red

00

1

Yellow

Green

01

0

Yellow

Green

01

1

Red

Yellow

10

0

Green

Yellow

10

1

Yellow

Red

00

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