How many logic gates are needed to build the 4-bit carry-lookahead adder
Each B cell requires 3 gates. Hence, 12 gates are needed for all four B cells. The carries c1, c2, c3, and c4 produced by the carry-lookahead logic, require 2, 3, 4, and 5 gates, respectively. According to the four logic expressions, c1 = G0 + P0c0 c2 = G1 + P1G0 + P1P0c0 c3 […]
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