Carry propagation circuit for decimal code arithmetic circuits - has additional output logic circuitry for rapid processing of carrier

摘要

A digital arithmetic circuit provides addition and substractor of decimally coded numbers with a 5211 weighting. The input bits of the two numbers (A,B) are received by a combinational logic section (1-7) and a pair of binary full adder stages (25,26). A carry input (X) is combined and the carry (y) results from a logic gate (27) coupled to the output line (c) as part of an output adder stage (30). A flip-flop provides a latching function. ADVANTAGE - Reduces carry propagation time in parallel addition or substraction.