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Dsdlab Experiment 3.

The document describes Vikash Gurjar's experiment to implement a full adder using different modeling techniques in Xilinx software. It includes code and simulation results for implementing a full adder using data flow modeling, structural modeling, and using two half adders. The full adder is tested with different input combinations of a, b, and cin and the output sum and carry are observed on the waveform.

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20 views6 pages

Dsdlab Experiment 3.

The document describes Vikash Gurjar's experiment to implement a full adder using different modeling techniques in Xilinx software. It includes code and simulation results for implementing a full adder using data flow modeling, structural modeling, and using two half adders. The full adder is tested with different input combinations of a, b, and cin and the output sum and carry are observed on the waveform.

Uploaded by

chinusood08
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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NAME: Vikash Gurjar

ROLL NO: 21104111

EXPERIMENT: 3(a)
AIM: Implement full adder using data flow and structural modeling
SOFTWARE: Xilinx
Full adder using data flow modelling
Code:
`timescale 1ns / 1ps

module fulladder(

input a,

input b,

input cin,

output sum,

output carry );

assign sum = (a^b)^cin ;

assign carry = (a&b)|(b&cin)|(cin&a);

endmodule

RTL:

SIMULATION:
`timescale 1ns / 1ps

module full_adders();

reg a,b,cin;
wire s,carry;

fulladder uut(a,b,cin,s,carry);

initial

begin

a = 0; b = 0;cin=0;

#20 a = 0; b = 0;cin=1;

#20 a = 0; b = 1;cin=0;

#20 a = 0; b = 1;cin=1;

#20 a = 1; b = 0;cin=0;

#20 a = 1; b = 0;cin=1;

#20 a = 1; b = 1;cin=0;

#20 a = 1; b = 1;cin=1;

#20 $finish;

end

endmodule

WAVEFORM:

Full Adder using Structural Modelling


Code:
`timescale 1ns / 1ps

module fulladder(

input a,b,cin,

output sum,carry);

wire w,x,y,z;

xor(sum ,a,b,cin);
and( w,a,b);

and(x,b,cin);

and(y,cin,a);

or(z,w,x);

or(carry,z,y);

endmodule

Full Adder Simulation using Structural Modelling


`timescale 1ns / 1ps

module full_adders();

reg a,b,cin;

wire s,carry;

fulladder uut(a,b,cin,s,carry);

initial

begin

a = 0; b = 0;cin=0;

#20 a = 0; b = 0;cin=1;

#20 a = 0; b = 1;cin=0;

#20 a = 0; b = 1;cin=1;

#20 a = 1; b = 0;cin=0;

#20 a = 1; b = 0;cin=1;

#20 a = 1; b = 1;cin=0;

#20 a = 1; b = 1;cin=1;

#20 $finish;

end

endmodule

RTL:
WAVEFORM:

EXPERIMENT: 3(b)
AIM: Implement full adder using two half adder
Full adder using two half adder
Code:
`timescale 1ns / 1ps

module half_adder_(

input a,b,

output sum,carry

);

xor(sum,a,b);

and(carry,a,b);

endmodule

module full_adder(

input a,b,cin,

output sum,carry);
wire c,c1,s;

half_adder_ ha0(a,b,s,c);

half_adder_ ha1(cin,s,sum,c1);

or(carry,c,c1);

endmodule

simulation
code:
`timescale 1ns / 1ps

module full_adders();

reg a,b,cin;

wire s,carry;

full_adder uut(a,b,cin,s,carry);

initial

begin

a = 0; b = 0;cin=0;

#20 a = 0; b = 0;cin=1;

#20 a = 0; b = 1;cin=0;

#20 a = 0; b = 1;cin=1;

#20 a = 1; b = 0;cin=0;

#20 a = 1; b = 0;cin=1;

#20 a = 1; b = 1;cin=0;

#20 a = 1; b = 1;cin=1;

#20 $finish;

end

endmodule

RTL
Waveform:

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