8-bit_Carry_Look_Ahead_Adder.v

////////////////////////////////////////////////////////
//8-bit Carry Look Ahead Adder 
////////////////////////////////////////////////////////

module carry_look_ahead_8bit(a,b, cin, sum,cout);
input [7:0] a,b;
input cin;
output [7:0] sum;
output cout;

wire [7:0] p,g,c;

assign p=a^b;//propagate
assign g=a&b; //generate

//carry=gi + Pi.ci

assign c[0]=cin;
assign c[1]= g[0]|(p[0]&c[0]);
assign c[2]= g[1] | (p[1]&g[0]) | p[1]&p[0]&c[0];
assign c[3]= g[2] | (p[2]&g[1]) | p[2]&p[1]&g[0] | p[2]&p[1]&p[0]&c[0];
assign c[4]= g[3] | (p[3]&g[2]) | p[3]&p[2]&g[1] | p[3]&p[2]&p[1]&g[0] | p[3]&p[2]&p[1]&p[0]&c[0];
assign c[5]= g[4] | (p[4]&g[3]) | p[4]&p[3]&g[2] | p[4]&p[3]&p[2]&g[1] | p[4]&p[3]&p[2]&p[1]&g[0] | p[4]&p[3]&p[2]&p[1]&p[0]&c[0];
assign c[6]= g[5] | (p[5]&g[4]) | p[5]&p[4]&g[3] | p[5]&p[4]&p[3]&g[2] | p[5]&p[4]&p[3]&p[2]&g[1] | p[5]&p[4]&p[3]&p[2]&p[1]&g[0] | p[5]&p[4]&p[3]&p[2]&p[1]&p[0]&c[0];
assign c[7]= g[6] | (p[6]&g[5]) | p[6]&p[5]&g[4] | p[6]&p[5]&p[4]&g[3] | p[6]&p[5]&p[4]&p[3]&g[2] | p[6]&p[5]&p[4]&p[3]&p[2]&g[1] | p[6]&p[5]&p[4]&p[3]&p[2]&p[1]&g[0] | p[6]&p[5]&p[4]&p[3]&p[2]&p[1]&p[0]&c[0];
assign cout= g[7] | (p[7]&g[6]) | p[7]&p[6]&g[5] | p[7]&p[6]&p[5]&g[4] | p[7]&p[6]&p[5]&p[4]&g[3] | p[7]&p[6]&p[5]&p[4]&p[3]&g[2] | p[7]&p[6]&p[5]&p[4]&p[3]&p[2]&g[1] | p[7]&p[6]&p[5]&p[4]&p[3]&p[2]&p[1]&g[0] | p[7]&p[6]&p[5]&p[4]&p[3]&p[2]&p[1]&p[0]&c[0];
assign sum=p^c;

endmodule