Table of contents
1. Basic use of proteus software interface
4. Parallel connection of adders
4. Experimental results and analysis
2. The result of the parallel operation of the adder
Using 74LS283 to Realize Four-bit Binary Addition
1. Purpose of the experiment
- Master the usage of common commands of Proteus software and understand the basic composition and working principle of microcomputer.
- Master the basic use of adders
2. Experimental principle
An adder is one of the essential components in computer operations, and it is used to perform addition operations on binary numbers. In computer systems, adders are widely used in modules such as arithmetic logic unit (ALU) and floating-point unit (FPU), which can complete basic operations such as addition, subtraction, multiplication, and division of integers and floating-point numbers. In the principles of computer composition , adders mainly study and discuss the design and implementation principles of adders. By constructing circuit models including half adders, full adders and multi-bit adders, students can gain a deep understanding of the operating principles and components of adders, and master the basic operation methods of binary addition . During the experiment, it is necessary to pay attention to the correctness and optimization of the circuit design, and also to analyze and verify the simulation results to ensure the correctness and reliability of the adder.
3. Experimental content
1. Basic use of proteus software interface
(1) Create a new file or open an existing file through the File interface
(2) The original model used must be placed in the blue box
(3) The Proteus toolbar is as follows
(4) Click the button on the left toolbar to enter the component mode, and click the button again to call up the component library
2. Find the component library
(1) Adder-related chips
74HC181
8086
74S283
(2) AND, OR, NOT gate-related chips
OR gate
3. Adders connected in series
4. Parallel connection of adders
4. Experimental results and analysis
1. Adder series result
2. The result of the parallel operation of the adder
*5. Thinking questions
Using 74LS283 to Realize Four-bit Binary Addition
(1) The circuit diagram is as follows
(2) Screenshot of running results
(3) Analysis of running results
Addend A3A2A1A0:0011 B3B2B1B0:1010
Expected result: 1101 (13)
The output result of the designed circuit is 1101, which is consistent with the expected result and realizes the function of the adder.
6. Experimental summary
1. Some very critical details should be paid attention to during the experiment, which is the key to getting correct experimental results. For example, when using 74LS283 to perform adder operations, I forgot to connect the power supply and ground at the beginning, resulting in failure to obtain the desired result. After checking the data and adjusting later, the correct operation result can be obtained
2. After this computer composition principle experiment, I have a deeper understanding of the principle and implementation of the adder . First of all, we learned the basic principle and structure of the full adder, and realized the addition of one-bit binary numbers by building a circuit. At the same time, we mastered the method of cascading multiple full adders to realize the addition of multi-bit binary numbers. In the experiment, we used 74LS08, 74LS32, 74LS04 and other integrated circuit components for circuit design and implementation. Secondly, we found through experiments that when performing addition operations, carry may occur. To solve this problem, we also learned adders with carry, including carry adder (CLA) and accumulator (AC). Through experiments, we have successfully built a carry adder circuit for 4-bit binary numbers. Finally, in the process of writing the experimental report, I further exercised my thinking ability and expression ability. Through the summary and analysis of the experimental principle, experimental process and results, I have a better understanding of the working method and application scenarios of the adder. In a word, this computer composition principle adder experiment not only enhanced our practical ability, but also deepened our understanding and application of adder.