## Why is it called ripple carry adder?

## How to construct 4-bit ripple carry adder VHDL code?

- The 4-bit
**Ripple Carry Adder**VHDL Code can be Easily Constructed by Port Mapping 4 Full**Adder**. The following figure represent the 4-bit**ripple carry adder**. In the above figure, A, B 4-bit input, C0 is**Carry**in and S 4-bit output , C4 is**Carry**out. The remaining C1, C2, C3 are intermediate**Carry**. They are called signals in VHDL Code.

## What is carry adder and carry look ahead adder?

**Ripple carry adder**and**carry**look ahead**adder**are two different kinds of digital binary adders based on the**carry**determining technique. Both adders can add the numbers without any problem. We will briefly discuss both adders in this article.

## How to add two 4-bit binary numbers using 4x ripple carry adder?

- 4-bit
**ripple carry adder**is used for the purpose of adding two 4-bit binary numbers. In Mathematics, any two 4-bit binary numbers A 3 A 2 A 1 A 0 and B 3 B 2 B 1 B 0 are added as shown below- Using**ripple carry adder**, this addition is carried out as shown by the following logic diagram-

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