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- W2023914367 abstract "We present a unified framework to compare and optimize various adders in the literature including carry-ripple adders, carry-look-ahead adders, prefix-adders, canonic adders, block-based carry-look-ahead adders, carry-skip adders, conditional-sum adders, carry-select adders and hybrid adders. The logic of all those adders can be separated into two parts: the carry logic and the sum logic, while carries can be generated by a uniformed carry operator implemented by any of the prefix operator, the FCO operator, MUX, the AND-OR gates and pass-transistors. The most efficient way to generate carries is by layers instead of by groups, where layers are non-consecutive non-equal length collections. We demonstrate that the conditional-sum adders and carry-select adders have redundant sum logic and sub-optimal carry logic; therefore they should be eliminated. We show how to design efficient carry logic by layers of carries and improve some prefix addition algorithms such as the Brent-Kung's adder for carry generation. The ideas discussed here are independent of the implementation technology and therefore useful for all implementations and technologies." @default.
- W2023914367 created "2016-06-24" @default.
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- W2023914367 date "2001-01-01" @default.
- W2023914367 modified "2023-09-24" @default.
- W2023914367 title "A unified adder design" @default.
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- W2023914367 doi "https://doi.org/10.1109/acssc.2001.986901" @default.
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