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Design a 4-Bit ALU with Basic Operations

The document describes the design of a 4-bit arithmetic logic unit (ALU) that performs AND, OR, XOR, and ADD operations. It contains 1-bit ALU components, bit switches, bit displays, and connecting wires. The 1-bit ALU takes two input bits A and B, an input carry, and two selection bits to determine the operation. The circuit was built in a simulator using the components and truth table, and tested with sample inputs to verify the AND, OR, XOR, and ADD operations.

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Cherry Charan Tej
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21 views4 pages

Design a 4-Bit ALU with Basic Operations

The document describes the design of a 4-bit arithmetic logic unit (ALU) that performs AND, OR, XOR, and ADD operations. It contains 1-bit ALU components, bit switches, bit displays, and connecting wires. The 1-bit ALU takes two input bits A and B, an input carry, and two selection bits to determine the operation. The circuit was built in a simulator using the components and truth table, and tested with sample inputs to verify the AND, OR, XOR, and ADD operations.

Uploaded by

Cherry Charan Tej
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Date EXP.N0. Page No.

ARITHMETIC LOGIC UNIT

AIM : To design a 4 bit ALU Comprising only the AND ,OR ,XOR and ADD operations.

COMPONENTS :

1) 1-Bit ALU :4
2) Bit Switches : 11
3) Bit Displays : 5
4) Connecting Wires

THEORY :

The circuit functionality of 1 bit ALU is shown ,depending upon the control signal S1
and S0

The circuit operates as follows:


For S1=0 , S0= 0 ,the output is A AND B. For S1=0 , S0= 1 ,the output is A OR B.

For S1=1 , S0= 0 ,the output is A XOR B.

For S1=1 , S0= 1 ,the output is A ADD B.

J.N.T.U.A College of Engineering (Autonomous), Pulivendula Department of Computer Science and Engineering
Date EXP.N0. Page No.

CIRCUIT DIAGRAM :

TRUTH TABLE :
S0 S1 Operation

0 0 AND

0 1 OR

1 0 XOR

1 1 ADD

PROCEDURE :

1) Start the Simulator as directed.


2) The pin configuration of a component is shown whenever the mouse is
hovered on any component of the palette .
3) For 1-bit ALU input Ao is in pin-9 ,Bo is in pin-10 , Co is in pin-11 (input
carry) .For Selection of operation , So is in pin-12 , S1 is in pin-13 , Output
F is in pin-8 and output carry is in pin-7.
4) Click on the 1-bit ALU component and then click on the position of the editor
window where you want to place it,Similarly add 3 more 1-bit ALU ,11 bit
Switches and 5 Bit Displays.
5) To connect any two components select the connection menu of the
palette and then click on target terminal.
6) According to circuit diagram ,connect all the components.
7) Now you give different inputs and check the result,the operations are
implemented using the truth table for 4-bit ALU given in the theory.

J.N.T.U.A College of Engineering (Autonomous), Pulivendula Department of Computer Science and Engineering
Date EXP.N0. Page No.

OUTPUT :

Case 1:S1=0 and S0=0 , AND Operation

Case 2:S1=0 and S0=1, OR Operation

J.N.T.U.A College of Engineering (Autonomous), Pulivendula Department of Computer Science and Engineering
Date EXP.N0. Page No.

Case 3: S1=1and S0=0 , XOR Operation

Case 4:S1=1 and S0=1 , ADD Operation

RESULT :
The construction of 4-bit ALU was completed successfully.

J.N.T.U.A College of Engineering (Autonomous), Pulivendula Department of Computer Science and Engineering

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