an enquiry about I2c testing in pulpino MC‏

[yousifashour1]

i can not understand what have happened here in this code
why we assigned 0 to these signals
and how can i test i2c with another one ?
in this snippet code
//

                wr_d:
                begin
                    c_state <= idle;
                    cmd_ack <= 1'b1;
                    scl_oen <= 1'b0; // set SCL low
                    sda_oen <= din;
                    sda_chk <= 1'b0; // don't check SDA output (SCL low)
                end

          endcase
  end

//FIXME ANTONIO CHECK
// assign scl and sda output (always gnd)
assign scl_o = 1'b0;  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<==================
assign sda_o = 1'b0;  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<==================

endmodule

//

thank you in advance

[yousifashour1]