Explain the working of bcd adder, Computer Engineering

Assignment Help:

Explain the working of BCD adder

One of the ways of adding decimal numbers in BCD is to use a 4-bit binary adder and perform arithmetic operation one digit at a time. The low-order pair of the BCD digits is first added to generate a binary sum if result is equal or greater than 1010, it is corrected by adding 0110 to the binary sum. The second operation produces an output- carry for the next pair of important digits. The next higher-order pair of digits, jointly with input-carry, is then added to produce their binary sum. If result is equal to or greater than 1010, it can corrected by adding 0110. The procedure is repeated until all the decimal digits are added.

The logic circuit which detects necessary correction can be derived from table entries. It is clear that a correction is needed when binary sum has an output carry K = 1. The other six combinations from 1010 to 1111 which need a correction have a 1 in position Z . To distinguish them from binary 1000 and 1001 that also have a8 1 in position Z , we specify further that either Z  or Z  must have the1. The condition for8 4 2 correction and an output-carry could be expressed by Boolean function

C = K + Z  Z  + Z  Z8 4 8 2

When C = 1, we require to add 0110 to binary sum and provide an output-carry for next stage.

BCD adder is circuit which adds two BCD digits in parallel and generates sum digit also in BCD. BCD adder must include correction logic in its internal construction

 

934_bcd adder.png


Related Discussions:- Explain the working of bcd adder

What are the characteristics of digital ics, What are the characteristics o...

What are the characteristics of digital ICs used to compute their performance? Ans: Characteristics of Digital Integrated Circuits 1. Speed of operation:   The Speed o

Define formal language grammar, Define formal language grammar? A forma...

Define formal language grammar? A formal language grammar is a set of formation rules which describe that strings made by the alphabet of a formal language are syntactically va

Explain that datagram cannot be larger than mtu of a network, "A datagram c...

"A datagram cannot be larger than the MTU of a network over which it is sent." Is the statement true or false? Explain with the help of a suitable example. All hardware technol

C++, minimum self program

minimum self program

Illustrate the accumulator architecture, Accumulator Architecture: An accu...

Accumulator Architecture: An accumulator is anespecially designated register which supplies one instruction operand and receives result. Instructions in such machines are usually

Using bit wise operator implement nor and nand gate, Q. Write a program t...

Q. Write a program to implement NOR, NAND, XOR and XNOR gates using and without using bit wise operator. Also perform necessary checking. The user has option to give n numbe

Operation codes used in assembly instructions, Q. Operation codes used in a...

Q. Operation codes used in assembly instructions? Now let's describe various operation codes needed for this machine so that we can translate High level language instructions t

Describe the concept of value creation, I am required to write about the im...

I am required to write about the impact of the internet on firms with reference to the following questions: 1. Describe the concept of value creation. Explain how a firm can use

Computer assignment problem, contributes to violence in our society. Others...

contributes to violence in our society. Others point out that television contributes to the high level of obesity among children. Now, we may have to add financial problems to the

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