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

Propositional versions of resolution, Propositional versions of resolution:...

Propositional versions of resolution: Just because of so far we've only looked at propositional versions of resolution. However in first-order logic we require to also deal wi

Two parallel fetch-implement, Take a CPU that shows two parallel fetch-impl...

Take a CPU that shows two parallel fetch-implement pipelines for superscalar processing. Determine the performance improvement over scalar pipeline processing and no-pipeline proce

write a ''c'' program to accept any 3 digit integer number, Write a 'C' pr...

Write a 'C' program to accept any 3 digit integer number from the keyboard and display the word equivalent representation of the given number

How many input ANDand OR gates are required, How many two input AND gates a...

How many two input AND gates and two input OR gates are required to realize Y = BD+CE+AB ? Ans. Here three product terms, therefore three AND gates of two inputs are needed.

Difference among using a filter and a query to find records, What is the di...

What is the difference among using a filter and a query to find records? Filter is used to quickly limit the records as we are already viewing in a Datasheet or a form to those

What is stack pointer, Stack pointer is a particular purpose 16-bit registe...

Stack pointer is a particular purpose 16-bit register in the Microprocessor, which grasp the address of the top of the stack.

Explain structured and modular programming, Structured and Modular programm...

Structured and Modular programming. Structured programming means the collection of principles and practices that are directed toward developing correct programs which are simpl

Explain the difference between ram and rom, RAM: Read / Write memory, High ...

RAM: Read / Write memory, High Speed, Volatile Memory. ROM: Read only memory, Low Speed, Non Voliate Memory.   RAM- Random Access memory it is a Volatile Memory.  volatil

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