module addbit ( a , // first input b , // Second input ci , // Carry input sum , // sum output co // carry output ); //Input declaration input a; input b; input ci; //Ouput declaration output sum; output co; //Port Data types wire a; wire b; wire ci; wire sum; wire co; //Code starts here assign {co,sum} = a + b + ci; endmodule // End of Module addbit g/iCE40/yosys' title='iCE40/yosys Git repository'/>
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/* This is a
  Multi line comment
  example */
module addbit (
a,
b,
ci,
sum,
co);

// Input Ports  Single line comment
input           a;
input           b;
input           ci;
// Output ports
output         sum;
output         co;
// Data Types      
wire            a;
wire            b;
wire            ci;
wire            sum;
wire            co; 

endmodule
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