Task 2: 4-bit Adder/Subtractor In the 2’s complement number system, we can accomplish the subtraction, A-B, by adding to A the 2’s complement of B; A – B = A + 2’s complement of B. This simple observation allows us to do subtraction using the same circuit used for addition. Note also that since 2’s complement of B = 1’s complement of B + 1 Therefore: A – B = A + 1’s complement of B + 1 Using the block diagram of a 4-bit adder/subtractor unit below, construct the actual circuit

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Task 2: 4-bit Adder/Subtractor In the 2’s complement number system, we can accomplish the subtraction, A-B, by adding to A the 2’s complement of B; A – B = A + 2’s complement of B. This simple observation allows us to do subtraction using the same circuit used for addition. Note also that since 2’s complement of B = 1’s complement of B + 1 Therefore: A – B = A + 1’s complement of B + 1 Using the block diagram of a 4-bit adder/subtractor unit below, construct the actual circuit
Add/Sub
B input (4-bit)
A input (4-bit)
1's
complement
Circuit
4-bit Ripple Adder
Carry in
Transcribed Image Text:Add/Sub B input (4-bit) A input (4-bit) 1's complement Circuit 4-bit Ripple Adder Carry in
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