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# ECE/CS 352 Digital Systems Fundamentals - PowerPoint PPT Presentation

ECE/CS 352 Digital Systems Fundamentals. Spring 2001 Chapter 3 -Part 2. Tom Kaminski & Charles R. Kime. Functional Block: Decoders. 2-to-4 Line Decoder. 2-to-4 Line Demultiplexer. Example: 74F138 Demultiplexer.

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### ECE/CS 352 Digital Systems Fundamentals

Spring 2001

Chapter 3 -Part 2

Tom Kaminski& Charles R. Kime

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

Note: This "Truth Table" uses the "x" to mean "this could be either 0 or 1". Thus, it "compacts" some of 26=64 lines.

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

Example 1:F(A,B) = m(0,3)

ECE/CS 352 Digital System Fundamentals

Example 1:F(X,Y,Z) = m(0,3,5,6)

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

Example: A 4-to-1 multiplexer

ECE/CS 352 Digital System Fundamentals

Note how similar the two are internally.

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

B

Y

00

01

11

10

B

Z

00

01

11

10

0

1

0

1

0

1

0

1

D0

D1

D3

D2

D0

D1

D3

D2

A

1

0

1

0

A

0

0

1

1

C

C

A

A

A

A

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

ECE/CS 352 Digital System Fundamentals

• Know the functions performed by the following functional blocks:

• Decoders

• Demultiplexers

• Encoders

• Multiplexers

• Know how to implement Boolean functions using:

• Multiplexers

• Decoders

ECE/CS 352 Digital System Fundamentals