Inventors:
Scott J. Campbell - Frederick CO, US
Brian D. Philofsky - Longmont CO, US
Lyman D. Lewis - Hudson NH, US
Assignee:
XILINX, Inc. - San Jose CA
International Classification:
G06F 7/50
Abstract:
A digital logic circuit includes at least one stage. Each stage includes sum logic, combinatorial logic, and carry chain logic. The sum logic is configured to generate a first sum signal from a first set of three input signals. The combinatorial logic includes a carry generation portion and a sum generation portion. The carry generation portion is configured to generate a first carry signal from a second set of three input signals. The sum generation portion is configured to generate a second sum signal from the first sum signal and the first carry signal. The carry chain logic is configured to process the first sum signal, the second sum signal, and a carry-in signal to generate a carry-out signal and a third sum signal.