Carry select adder using two level selectors

Details Carry select adder using two level selectors Carry select adder using two level selectors

1997-02-21

1999-12-14

Mai, Tan V.

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

708702, G06F 750

Patent

active

060030593

ABSTRACT:
A carry select adder including a two level carry selector connected to multiple carry chains. Two or more adders produce at least two pairs of candidate carry-out signals in parallel. For each pair, a first candidate carry-out signal is based on a first presumed carry-in signal and a second candidate carry-out signal is based on a second presumed carry-in signal different than the first presumed carry-in signal. A two-level selector for simultaneously selects, for each of the pairs of candidate carry-out signals, either the first candidate carry-out signal or the second candidate carry-out signal as an actual carry-out signal, based on an actual carry-in signal. Both selected carry out signals are passed to.

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