Carry Look ahead adder Propagate & Generate Outputs
The block diagram of a 16-bit CLA is divided into four 4-bit groups and comprises a combinatorial circuit, namely the look-ahead carry generator. The term Gk denotes the group- generated carry, whereas Pk denotes the group-propagated carry. All four groups generate their individual internal carries and then the sum bits. The section-carry generate, GG, and the section-carry propagate, PP, are also computed.