How do you write a code adder in Verilog?

How do you write a code adder in Verilog?

Below code shows the uses an always block which gets executed whenever any of its inputs change value.

1. module fulladder ( input [3:0] a,
2. input [3:0] b,
3. input c_in,
4. output reg c_out,
5. output reg [3:0] sum);
6. always @ (a or b or c_in) begin.
7. {c_out, sum} = a + b + c_in;
8. end.

What is the Boolean expression for a full adder?

The Boolean equation for the Full Adder is S = (~X*~Y*Z) + (~X*Y*~Z) + (X*~Y*~Z) + (X*Y*Z) where S is the sum of bit values. C = (X*Y) + (X*Z) + (Y*Z). The Full Adder is comprised of two exclusive OR gates, two AND gates, and one OR gate.

What is 1bit full adder?

A full adder is a combinational circuit that performs that adds two bits and a carry and outputs a sum bit and a crry bit. When all input bits are 0, the output is 0. The S output is equal to one when only one input is equal to 1 or three inputs are equal to 1.

What is 2bit full adder?

Overall, the 2-bit full adder computes the summation of A 1 A 0 + B 1 B 0 + C 0 , with S 0 and S 1 the first and second digits of the sum and C 2 the carry-out.

How to implement n-bit adder in Verilog?

The Verilog code for N-bit Adder is designed so that the N value can be initialized independently for each instantiation. To do it, the Verilog code for N-bit Adder uses Generate Statement in Verilog to create a chain of full adders for implementing the N-bit Adder.

How to model an adder circuit in Verilog?

Since an adder is a combinational circuit, it can be modeled in Verilog using a continuous assignment with assign or an always block with a sensitivity list that comprises of all inputs. The code shown below is that of the former approach. The code shown below uses an always block which gets executed whenever any of its inputs change value.

What is a 4-bit adder?

A full adder adds a carry input along with other input binary numbers to produce a sum and a carry output. An example of a 4-bit adder is shown below which accepts two binary numbers through the signals a and b which are both 4-bits wide.

What is the next Verilog/VHDL project?

The next Verilog/ VHDL project is a complete co-processor specially designed for cryptographic applications. The co-processor has standard instructions and dedicated function units specific for security. The co-processor is implemented mainly in VHDL, but the N-bit Adder is designed in Verilog.