[FPGA] Verilog: Binary parallel adder | Carry lookahead | Implementation of 4-bit binary parallel adder and subtractor | MSI/LSI operation circuit

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Ⅰ. Prerequisite knowledge

0x00 Parallel adders and subtractors

If we want to perform binary parallel operations on 4-bit adders and subtractors, we can create a circuit that performs N-bit additions and subtractions by connecting the adders and subtractors in N numbers in parallel.

4-bit binary parallel adder

4-bit binary parallel subtractor