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Browse Prior Art Database

Nor Block Full Adder

IP.com Disclosure Number: IPCOM000098399D
Original Publication Date: 1960-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Boyle, WW: AUTHOR

Abstract

The full adder, composed of seven NOR blocks, accepts signals representing the true and complement form of the binary digits A and B and the true and complement form of the carry input C(IN) from the previous bit position. The full adder provides two output signals, the complement of the SUM and the true carry out C(OUT). The seven NOR blocks perform the logic of the DAGGER function NOR block, each providing an output signal only when all of the input signals are absent. The Boolean expressions describe the output signals from each NOR block as a function of the input signals to the full-adder.

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Nor Block Full Adder

The full adder, composed of seven NOR blocks, accepts signals representing the true and complement form of the binary digits A and B and the true and complement form of the carry input C(IN) from the previous bit position. The full adder provides two output signals, the complement of the SUM and the true carry out C(OUT). The seven NOR blocks perform the logic of the DAGGER function NOR block, each providing an output signal only when all of the input signals are absent. The Boolean expressions describe the output signals from each NOR block as a function of the input signals to the full-adder.

The same full-adder circuit performs successfully when the seven NOR blocks perform the logic of the STROKE function NOR block, each providing an output signal when any of the input signals is absent. The STROKE function implementation of this full-adder requires that the complement of the input signals shown be applied to the full-adder. The complement of the output signals shown is provided.

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