OneBitFullAdderTB.v

// ***********************************************************
// One-Bit Adder Testbench:
// This testbench tests the functionality of a one-bit full adder
// ***********************************************************
//Marks the beginning of the module.
module OneBitFullAdderTB();
//Create three registers, which will be used to store data as inputs to the Adder.
reg Ain;
reg Bin;
reg CarryIn;
//Creates two wires, which will be used to store the output of the Adder.
wire SumOut;
wire CarryOut;
//Creates an instance of a Full Bit Adder, with the previously declared variables being passed into it.
OneBitFullAdder FA0(Ain, Bin, CarryIn, SumOut, CarryOut);
//Marks the beginning of the procedural block, which is to execute once at time 0.
initial
begin
//Assigns values to the inputs.
Ain = 1'b0;
Bin = 1'b0;
CarryIn = 1'b0;
//Delay.
#10;
//Assigns values to the inputs.
Ain = 1'b0;
Bin = 1'b1;
CarryIn = 1'b0;
//Delay.
#10;
//Assigns values to the inputs.
Ain = 1'b1;
Bin = 1'b1;
CarryIn = 1'b0;
//Delay.
#10;
//Assigns values to the inputs.
Ain = 1'b1;
Bin = 1'b1;
CarryIn = 1'b1;
//Delay.
#10;
//Marks the end of the simulation(?)
$finish;
//Marks the end of the procedural block.
end
//Marks the beginning of the procedural block.
initial
begin
//Outputs to the console.
$monitor("Ain=%1b, Bin=%1b, Carryin=%b, SumOut=%b, CarryOut=%b, time=%t\n", Ain, Bin, CarryIn,
SumOut, CarryOut, $time);
//Marks the end of the block.
end
endmodule