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

Shared memory model, In the shared-memory programming model, tasks share a ...

In the shared-memory programming model, tasks share a common address space, which they read and write asynchronously. Several mechanisms such as locks / semaphores may be used to c

Explain short note about molap?, Classic form of OLAP is called as MOLAP an...

Classic form of OLAP is called as MOLAP and it is often known as OLAP. Simple database structures like time period, product, location, etc are used. Functioning of each and every d

What are the techniques of data collection, What are the techniques of Data...

What are the techniques of Data Collection It can be either automatic or manual. Manual techniques can include: -  Keypads/Keyboards to type in data -  touch screens to s

Convert, haw to convert context free grammar to regular grammar

haw to convert context free grammar to regular grammar

Information distribution, INFORMATION DISTRIBUTION: The organization and m...

INFORMATION DISTRIBUTION: The organization and management of any institution, be it an isolated lab or a large site with many labs, requires that information is managed. Methods o

Disk operating system, Q. Disk operating system? The operating system (...

Q. Disk operating system? The operating system (OS) is the first program that should be loaded into the memory of your PC before you can use it for any application. You can st

Implemented in a program developed for sorting , A student counted up the n...

A student counted up the number of statements implemented in a program developed for sorting n integers and came up with a recurrence of the form: T(n) = a * n + b + 2T(n/2), an

Difference between the specparam and parameter constructs, What is the diff...

What is the difference between the specparam and parameter constructs? Specparam is a special kind of parameter which is intended to specify only timing and the delay values. K

Determine flip flop the msi chip is dual edge triggered, The MSI chip 7474 ...

The MSI chip 7474 is ? Ans. MSI chip 7474 is TTL, dual edge triggered D Flip-Flop.

Define the term package- object oriented modeling, Define the term package-...

Define the term package- object oriented modeling A package is a common purpose mechanism for organising elements into groups. Package can also contain other packages. The no

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