1. 1 CS151: Digital Design Chapters 4, 5 Review

2. CS 151 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.

3. CS 151 3 4 X 1 Line MUX Transmission Gate Multiplexer YS0S0 S1S1 I0I0 00 I1I1 10 I2I2 01 I3I3 11

4. CS 151 4 Question 2 Construct an 8-to-1-line multiplexer with enable input using transmission gates. YS0S0 S1S1 S2S2 I0I0 000 I1I1 100 I2I2 010 I3I3 110 I4I4 001 I5I5 101 I6I6 011 I 37 111

5. CS 151 5 8 x 1 MUX Y

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

7. 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).