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# CS151: Digital Design

CS151: Digital Design . Chapters 4, 5 Review. Question 1. Design a combinational circuit for a Roller-Coaster ride in an amusement park. The design should include a truth table, simplified Boolean function(s), and logic diagram. The Roller-Coaster Safety System has three sensors:

## CS151: Digital Design

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1. CS151: Digital Design Chapters 4, 5 Review

2. Question 1 Design a combinational circuit for a Roller-Coaster ride in an amusement park. The design should include a truth table, simplified Boolean function(s), and logic diagram. The Roller-Coaster Safety System has three sensors: • Speed: this sensor will generate a signal if the roller-coaster vehicle exceeds the speed limit • Safety: this sensor will generate a signal if one of the seatbelts is unbuckled • Stability: this sensor will generate a signal if the roller-coaster moves off the tracks The Roller-Coaster Safety System has two output features: • Slow: this will be activated to slow down the vehicle if the Speed sensor was on. • Shut-down: this will be activated to stop the roller-coaster if at least two sensors were on. CS 151

3. 4 X 1 Line MUX • Transmission Gate Multiplexer CS 151

4. Question 2 • Construct an 8-to-1-line multiplexer with enable input using transmission gates. CS 151

5. 8 x 1 MUX Y CS 151

6. Question 3 • Show that a positive logic NAND gate is a negative logic NOR gate. CS 151

7. Question 4 Design an Excess-3-to-BCD code converter, that gives output code 0000 for all invalid input combinations. Your design should include the truth table and simplified equations for each possible output. Note that possible inputs range from the exess-3 codes 0011 (0 decimal) to 1100 (9 decimal). CS 151

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