Logical arithmetic operating device

Abstract

Abstract PURPOSE: To obtain the operation result in a comparatively high speed, by combining a carry preserving adder and a carry propagating adder to obtain a simple logical arithmetic operating device. CONSTITUTION: The C input of carry preserving adder CSA having three input terminals is made all 0 or all 1, and two A and B inputs are used as operands, and their two outputs D and R are connected to input terminals E and F of carry propagating adder CPA. By making either of input terminals E and F all-zero signals, output of output terminals R and D appear as S as they pass through carry propagating adder CPA without stopping, thus obtaining a simple logical arithmetic operating device. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Akio Shinagawa
• 👤 Katsuyuki Iwata

Bibliographic Details