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  Hello Dear Readers, At Texas Instruments Bangalore, there is a vacancy for SoC RTL Design Engineer role. Are you looking for a career at one of the leading semiconductor companies in the world Texas Instruments (TI) is looking for a SoC RTL Design Engineer to join the team of enthusiastic engineers who develops highly complex mixed signal devices for audio applications with industry leading performance. These audio products are truly mixed-signal devices with highly integrated digital circuits such as a DSP core for digital filters and audio signal processing blocks, hardware processing blocks, analog controllers, various serial interfaces (Audio serial interfaces, I2C, SPI) and other digital blocks like clock-generation, registers map, Interrupts etc. This is a great opportunity to be part of an established team that’s continuing to look for growth opportunities, working with worldwide leading customers and developing cutting edge solutions in the areas of consumer electr...
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Carry Lookahead Adder Design And Implementation of Generic Parametrized Adder Using Verilog HDL

 Hello Dear Readers,

Today In this post I have designed a carry-lookahead adder design and implemented its parametrized version using Verilog HDL and analysis that design for the desire output. First of all, I have designed CLA based on the theory described in the below video of the Neso Academy.
     


Verilog Code:
module add (a, b, c, g, p, s); // adder and g, p
input a, b, c; // inputs: a, b, c;
output g, p, s; // outputs: g, p, s;
assign s=a ^ b ^ c; // output: sum of inputs
assign g = a & b; // output: carry generator
assign p = a | b; // output: carry propagator
endmodule

module gp (g,p,c_in,g_out,p_out,c_out); // carry generator, carry propagator
input [1:0] g, p; // lower level 2-set of g, p
input c_in; // lower level carry_in
output g_out,p_out,c_out; // higher level g, p, carry_out
assign g_out = g[1] | p[1] & g[0]; // higher level carry generator
assign p_out = p[1] & p[0]; // higher level carry propagator
assign c_out = g[0] | p[0] & c_in; // higher level carry_out
endmodule

module cla_2 (a, b, c_in, g_out, p_out, s); // 2-bit carry lookahead adder
input [1:0] a, b; // inputs: a, b
input c_in; // input: carry_in
output g_out, p_out; // outputs: g, p
output [1:0] s; // output: sum
wire [1:0] g, p; // internal wires
wire c_out; // internal wire
// add (a, b, c, g, p, s); // generates g,p,s
add a0 (a[0], b[0], c_in, g[0], p[0], s[0]); // add on bit 0
add a1 (a[1], b[1], c_out, g[1], p[1], s[1]); // add on bit 1
// gp (g, p, c_in, g_out, p_out, c_out); // higher level g,p
gp gp0 (g, p, c_in, g_out, p_out, c_out); // higher level g,p
endmodule

module cla_4 (a,b,c_in,g_out,p_out,s); // 4-bit carry lookahead adder
input [3:0] a, b; // inputs: a, b
input c_in; // input: carry_in
output g_out, p_out; // outputs: g, p
output [3:0] s; // output: sum
wire [1:0] g, p; // internal wires
wire c_out; // internal wire
cla_2 a0 (a[1:0],b[1:0],c_in, g[0],p[0],s[1:0]); // add on bits 0,1
cla_2 a1 (a[3:2],b[3:2],c_out,g[1],p[1],s[3:2]); // add on bits 2,3
gp gp0 (g,p,c_in, g_out,p_out,c_out); // higher level g,p
endmodule

module cla_8 (a,b,c_in,g_out,p_out,s); // 8-bit carry lookahead adder
input [7:0] a, b; // inputs: a, b
input c_in; // input: carry_in
output g_out, p_out; // outputs: g, p
output [7:0] s; // output: sum
wire [1:0] g, p; // internal wires
wire c_out; // internal wire
cla_4 a0 (a[3:0],b[3:0],c_in, g[0],p[0],s[3:0]); // add on bits 0-3
cla_4 a1 (a[7:4],b[7:4],c_out,g[1],p[1],s[7:4]); // add on bits 4-7
gp gp0 (g,p,c_in, g_out,p_out,c_out); // higher level g,p
endmodule

module cla_16 (a,b,c_in,g_out,p_out,s); // 16-bit carry lookahead adder
input [15:0] a, b; // inputs: a, b
input c_in; // input: carry_in
output g_out, p_out; // outputs: g, p
output [15:0] s; // output: sum
wire [1:0] g, p; // internal wires
wire c_out; // internal wire
cla_8 a0 (a[7:0], b[7:0], c_in, g[0],p[0],s[7:0]); // add on bits 0-7
cla_8 a1 (a[15:8],b[15:8],c_out,g[1],p[1],s[15:8]); // add on bits 8-15
gp gp0 (g,p,c_in, g_out,p_out,c_out); // higher level g,p
endmodule

module CLA_32(a,b,c_in,g_out,p_out,s);
input [31:0] a, b; // inputs: a, b
input c_in; // input: carry_in
output g_out, p_out; // outputs: g, p
output [31:0] s; // output: sum
wire [1:0] g, p; // internal wires
wire c_out; // internal wire
cla_16 a0 (a[15:0], b[15:0], c_in, g[0],p[0],s[15:0]); // + bits 0-15
cla_16 a1 (a[31:16],b[31:16],c_out,g[1],p[1],s[31:16]); // + bits 16-31
gp gp0 (g,p,c_in,g_out,p_out,c_out);
endmodule

module cla32 (a,b,ci,s); // 32-bit carry lookahead adder, no g, p outputs
input [31:0] a, b; // inputs: a, b
input ci; // input: carry_in
output [31:0] s; // output: sum
wire g_out, p_out; // internal wires
CLA_32 cla (a, b, ci, g_out, p_out, s); // use cla_32 module
endmodule

Simulational Results:




Parametrized Version Verilog Code:
module carry_lookahead_adder(A,B,S,Cout,Cin);
    parameter N = 4;
    
    input [N-1:0]A,B;
    input Cin;
    output [N-1:0]S;
  output Cout;

    wire [N-1:0]P, G ;
    wire [N:0]C;
    propagate_generate #(.N(N)) M1(.A(A), .B(B), .P(P), .G(G));
    carry_generate #(.N(N)) M2 (.P(P), .G(G), .C(C), .Cin(Cin));

    assign S = P ^ C;
    assign Cout = C[N];

endmodule


module propagate_generate(A,B,P,G);
    parameter N = 4;
    input [N-1 :0] A,B;
    output [N-1 :0]P,G;

    assign P = A^B;
    assign G = A&B;

endmodule


module carry_generate(P,G,C,Cin);
    parameter N = 4;
    input [N-1:0]P,G;
  input Cin;
    output [N:0]C;
    assign C[0] =Cin;
    genvar i;
  generate for(i=1;i<=N;i=i+1) begin
        assign C[i] = G[i-1] | (P[i-1]&C[i-1]);
    end
    endgenerate

endmodule


Test Bench Verilog Code:

module tb;
    reg [2:0]A,B;
    wire [2:0]S;
    reg Cin;
    wire Cout;

    carry_lookahead_adder #(.N(3)) DUT(.A(A), .B(B), .S(S), .Cout(Cout), .Cin(Cin));


    task load(input [2:0]a,b, input c); begin
        A = a;
        B = b;
      Cin = c;    
    end
    endtask

    integer i , j,k;
    initial begin
        $dumpfile ("carry_lookahead_adder.vcd");
        $dumpvars (0, tb);  
        for (k=0;k<2;k=k+1) begin
            for (i=0; i<8 ; i=i+1) begin
                for(j=0;j<8;j=j+1) begin
                    load(i,j,k);
                    #10;
                end
            end
        end
        $finish;
    end
    initial $monitor("A = %b, B = %b, Cin = %b, Cout = %b, Sum = %b",A,B,Cin,Cout,S);

endmodule

Simulational Results:


If you want to implement its entire RTL to GDSII then refer to the below articles series.




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