4-BIT Parallel Adder | Student Projects https://studentprojects.in Microcontroller projects, Circuit Diagrams, Project Ideas Sat, 09 Jun 2012 08:54:29 +0000 en-US hourly 1 https://wordpress.org/?v=6.1.7 Verilog HDL program for 4-BIT Parallel Adder https://studentprojects.in/electronics/verilog-hdl/verilog-hdl-program-for-4-bit-parallel-adder/ https://studentprojects.in/electronics/verilog-hdl/verilog-hdl-program-for-4-bit-parallel-adder/#comments Sat, 02 Jun 2012 07:04:44 +0000 http://studentprojects.in/?p=3019 A 4 bit binary parallel adder can be formed by cascading four full adder units. The carry of each stage is connected to the next unit as the carry in (That is the third input). module parad4(a,c,p,q); output [3:0]a; output c; input [3:0]p,q; wire c1,c2,c3; ha u1(a[0],c1,p[0],q[0]); fa u2(a[1],c2,p[1],q[1],c1); fa u3(a[2],c3,p[2],q[2],c2); fa u4(a[3],c,p[3],q[3],c3); endmodule

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]]> A 4 bit binary parallel adder can be formed by cascading four full adder units. The carry of each stage is connected to the next unit as the carry in (That is the third input).

module parad4(a,c,p,q);
    output [3:0]a;
    output c;
    input [3:0]p,q;
    wire c1,c2,c3;
    ha u1(a[0],c1,p[0],q[0]);
    fa u2(a[1],c2,p[1],q[1],c1);
    fa u3(a[2],c3,p[2],q[2],c2);
    fa u4(a[3],c,p[3],q[3],c3);
endmodule
Simulated waveform for Parallel Adder
Simulated waveform for Parallel Adder

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