adder

Adders' Architectures:

1. Ripple Carry Adder ("rca")
2. Hierarchical Carry Look-Ahead ("hcla")
3. Kogge-Stone Adder Radix-2 ("ksa")
4. Sklansky Adder Radix-2 ("skla")
5. Han-Carlson Adder Radix-2 ("hca")
6. Brent-Kung Adder Radix-2 ("bka")
7. Ladner-Fischer Adder Radix-2 ("lfa")

P.S.

For full usage of adder (sign operations & subtraction) use the top module: adder.v

Ripple Carry Adder

Example: 16-bit Ripple Carry Adder

Hierarchical Carry Look-Ahead

Example: 16-bit Hierarchical Carry Look-Ahead (SUBNUM = 4)

Parallel Prefix Adders

Parallel Prefix Stages

Kogge-Stone Adder

Example: 16-bit Kogge-Stone Adder (Radix-2)

Sklansky Adder

Example: 16-bit Sklansky Adder (Radix-2)

Han-Carlson Adder

Example: 16-bit Han-Carlson Adder (Radix-2)

Brent-Kung Adder

Example: 16-bit Brent-Kung Adder (Radix-2)

Ladner-Fischer Adder

Example: 16-bit Ladner-Fischer Adder (Radix-2)