Cart (Loading....) | Create Account
Close category search window

RBCD: redundant binary coded decimal adder

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Shirazi, B. ; Dept. of Comput. Sci. & Eng., Southern Methodist Univ., Dallas, TX, USA ; Yun, D.Y.Y. ; Zhang, C.N.

The major advantage of the binary coded decimal (BCD) system is in providing rapid binary-decimal conversion. The shortcoming of the BCD system is that BCD arithmetic operations are often slow and require complex hardware. The performance of BCD operations can be improved through a redundant binary coded decimal (RBCD) representation which leads to carry-free operations. This paper introduces the VLSI design of an RBCD adder. The design consists of two small PLAs and two 40-bit binary adders for one digit of the RBCD adder. The addition delay is constant for n-digit RBCD addition (no carry propagation delay). The VLSI time and space complexities of the design as well as its layout are presented. In addition, the authors show that BCD to RBCD conversion can be carried out in a constant time. However, RBCD to BCD conversion requires a carry-ripple operation which can be accomplished with a complexity equivalent to that of the carry-look-ahead circuitry.

Published in:

Computers and Digital Techniques, IEE Proceedings E  (Volume:136 ,  Issue: 2 )

Date of Publication:

Mar 1989

Need Help?

IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.