Experiment #2: Introduction to Logic Functions and their Gate-Level Hardware Implementations CPE 169 Digital Design Laboratory

Basic Logic Functions Defined with Truth Tables ANDOR Complement ABF ABF AF 01 10

Basic Logic Gates Hardware used to implement logic functions ANDOR Complement

Other Common Logic Gates Can be constructed from basic logic gates NANDNORXOR ABF ABF ABF

Nexys Development Board Nexys Board

Integrated Circuits (ICs) ICs contain logic gates SSI (small scale integration) transistors per IC DIPs (dual in-line packages) Require power supply (Vcc, GND) 7400 Package Interior Layout7400 Dual In-Line Package

Circuit Implementation on Nexys Board Chips (IC’s) are place on Solderless Breadboard Solid-core wire connect circuit elements Power (Vcc) and Ground (GND) from Nexys

Solderless Breadboard Physical connections made without soldering Certain holes are physically connected to other holes physical hole connections

Circuit Connections to Nexys Signals Solid-core wire used for circuit connections to the Expansion Connector Nexys Board Nexys Expansion Connectors

Detailed Schematic Diagram Normal schematic diagram plus various IC related information: Pin numbers IC labels Gate labels Schematic DiagramDetailed Schematic Diagram

Experiment 2 Procedure Overview Implement basic logic circuits on the breadboard using Integrated Circuits 2-Input NAND 4-Input NAND 2-Input XOR 2-Input AND Made from NAND + Inverter (also from NAND) Verify your hardware implementations of each logic function. HEY!! There’s no “AND” gate IC in my Parts Kit !!?! ??