Transcript present_exp2_nexys_wcp

CPE 169
Digital Design
Laboratory
Experiment #2:
Introduction to Logic Functions and their
Gate-Level Hardware Implementations
Basic Logic Functions
• Defined with Truth Tables
AND
OR
A
B
F
0
0
1
1
0
1
0
1
0
0
0
1
A
0
0
1
1
B
0
1
0
1
Complement
F
0
1
1
1
A
0
1
F
1
0
Basic Logic Gates
• Hardware used to implement logic functions
AND
OR
Complement
Other Common Logic Gates
• Can be constructed from basic logic gates
NAND
A
B
F
0
0
1
1
0
1
0
1
1
1
1
0
NOR
A
0
0
1
1
B
0
1
0
1
XOR
F
1
0
0
0
A
0
0
1
1
B
0
1
0
1
F
0
1
1
0
Nexys Development Board
Nexys Board
Integrated Circuits (ICs)
• ICs contain logic gates
• SSI (small scale integration) 50-100
transistors per IC
• DIPs (dual in-line packages)
• Require power supply (Vcc, GND)
7400 Package Interior Layout
7400 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 Diagram
Detailed Schematic Diagram
Experiment 2 Procedure
Overview
• Implement basic logic circuits on the
breadboard using Integrated Circuits
2-Input NAND
4-Input NAND
HEY!!
2-Input XOR
There’s no #&$@^!
2-Input AND
“AND” gate IC in my
Made from NAND + InverterParts Kit !!?!
(also from NAND)
• Verify your hardware
?? implementations of
each logic function.