Explain about 4-bit adder-subtractor circuit, Computer Engineering

Assignment Help:

Q. Explain about 4-bit adder-subtractor circuit?

Subtraction operation on binary numbers can be obtained by succession of addition operations only it implies that to achieve subtraction A-B we can find 2's complement of B. This can be computed by 1's complemented and then adding 1 to it. So a common circuit can carry out addition and subtraction operation. A 4-bit adder subtraction circuit is displayed in figure below that is formed by employing XOR gate with each full adder. XOR gate with output 0 is for inspecting overflow.

2153_Explain about 4-bit adder-subtractor circuit.png

Figure: 4-bit adder-subtractor circuit

Control input 'x' controls operations it implies that if x =0 then circuit acts as an adder and if x =1 then circuit acts as a subtractor. The operation is summarized as below:

a. When x = 0, c = 0, output of all XOR gates would be same as corresponding input Bi where i = 0 to 3. So Ai and Bi are added by full adders providing Sum Si and carry Ci .

b. When x = 1 output of all XOR gates will be complement of input Bi where i =0 to 3 to that carry C0=1 is added. So circuit finds A plus 2's complement of B which is equal to A-B.


Related Discussions:- Explain about 4-bit adder-subtractor circuit

Simplify the expressions by using boolean postulates, Simplify the given ex...

Simplify the given expressions using Boolean postulates Y = (A + B)(A‾ + C)(B + C) Ans. Y = (A + B)(A‾ + C)(B + C) = (A A‾ + AC + B A‾ + BC) (B + C) = (AC + B A‾ + BC) (B + C)

Show the shared programming using library routines, Q. Show the Shared Prog...

Q. Show the Shared Programming Using Library Routines? The mainly well-liked of them is use of combo function known as fork() and join(). Fork() function is used to initialize

.rapid technology, Choose one area of rapid technological change in IT or C...

Choose one area of rapid technological change in IT or Computer Science and research and report on recent developments and the outlook for the future in the area that you have chos

State the advantages of bespoke software, State the advantages of Bespoke ...

State the advantages of Bespoke Software -  specifically designed for application and hence more efficient and will only contain the features wanted; as it will be devoid of

Define assembly, Define Assembly Assembly is a one deployable unit that...

Define Assembly Assembly is a one deployable unit that contains information about the execution of classes, structures and interfaces. it also keeps the information about itsel

Face recognition using java, how we get a perfect tutorial for face recogn...

how we get a perfect tutorial for face recognition using java

Implementing protection with virtual memory, Implementing Protection with V...

Implementing Protection with Virtual Memory - computer architecture: To enable the operating system to implement protection in the VM system, the HW have to: I. Support at

Explain what is a transaction in sap terminology, Explain what is a transac...

Explain what is a transaction in SAP terminology. In SAP terminology, a transaction is series of logically linked dialog steps.

Boolean algebra, https://www.chegg.com/homework-help/questions-and-answers/...

https://www.chegg.com/homework-help/questions-and-answers/57-karnaugh-maps-7-diagram-shows-system-hot-chocolate-drinks-vending-machine-vending-machi-q91661540

What are ramps, Ramps A network planning method that makes the most wel...

Ramps A network planning method that makes the most well-organized use of manpower, materials and cash resources between several projects going on concurrently.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd