Connecting ports by ordered list or by name

• For user-created lower-level components, the port connection is defined by the module declaration’s port list order.
  module half_adder (co, sum, a, b);
  
  • Therefore for the first half_adder :
  • The ports are connected by ordered list
  • The order of the port connection does matter
    • co -> c1, sum -> s1, a -> a, b -> b
      

• For the second half_adder:
  • The ports are connected by name
  • The order of the port connection does not matter
    • a -> s1, b -> cin, sum -> fsum, co ->c2

module full_adder(fco, fsum, cin, a, b);

output fco, fsum;

input cin, a, b;

wire c1, s1, c2;

half_adder u1(c1, s1, a, b);

half_adder u2(.a(s1), .b(cin),

.sum(fsum), .co(c2));

or u3(fco, c1, c2);

endmodule

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