Digital Logic Design, 4th Edition

12

Arithmetic circuits

12.1 Introduction

One important aspect of digital design with MSI circuits not dealt with in earlier chapters is the design and implementation of arithmetic circuits. Originally, the basic arithmetic circuits were designed using discrete components, but this method has long been superseded by the introduction of MSI circuits. Multi-bit adders, arithmetic logic units and other circuits are now readily available as medium scale integrated circuits.

In some cases, a required arithmetic function is not available in a standard MSI package and modifying logic may be required. A typical example of this is the implementation of a binary adder/subtractor or a circuit used for the implementation of BCD arithmetic. The modifying ...