National University of Computer & Emerging Sciences- CFD Campus
Department of Electrical Engineering
Digital Logic Design
Lecture 03
National University of Computer & Emerging Sciences
Instructor:
Salman Ajmal
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03 dld lecture, Lecture notes of Digital Electronics
it deals with the digital logic design course
Typology: Lecture notes
2015/2016
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National University of Computer & Emerging Sciences- CFD Campus Department of Electrical Engineering
Digital Logic Design
Lecture 03
National University of Computer & Emerging Sciences Instructor: Salman Ajmal
Recap
- Octal Number System
- Alternate Representations
- Excess Code
- BCD Code
- Gray Code
- Alphanumeric Code (ASCII)
- Error Detection using Parity Bit
AND Gate
- 1 output
- 2 inputs
- 3 inputs
- 4 inputs
- Multiple inputs 0 & 0 0
AND Gate function
- Logical Multiplication function Input Output A B F 0 0 0 0 1 0 1 0 0 1 1 1 F A B F A B C .... N
AND Gate Timing Diagram
t 0 t 1 t 2 t 3 t 4 t 5 t 6 A B F
OR Gate
- 1 output
- 2 inputs
- 3 inputs
- 4 inputs
- Multiple inputs 0 >= 0 0
OR Gate Timing Diagram
t 0 t 1 t 2 t 3 t 4 t 5 t 6 A B F
F = ??
OR Gate Timing Diagram
t 0 t 1 t 2 t 3 t 4 t 5 t 6 A B F
NOT Gate function
- Invert function Input Output A F 0 1 1 0
F A
NOT Gate Timing Diagram
t 0 t 1 t 2 t 3 t 4 t 5 t 6 A F
F = ??
AND Gate Applications
- Enable/Disable Device
- Counter counts when it receives pulses U/D Reset B 1 B 8 Carry out ENB Counter A B Clock Pulses Enable Disable
OR Gate Applications
- Car door open alarm Alarm Front left door Rear left door Front right door Rear right door
Alternate Representations
NAND Gate
- 1 output
- 2 inputs
- 3 inputs
- 4 inputs
- Multiple inputs 0 & 0 0