`timescale 1us/1us

module ser_to_par_tb;

logic clk_i;
logic rst_i;
logic dat_i;
logic dat_valid;
logic [7:0] dat_o;

ser_to_par uut (
  .clk_i(clk_i),
  .rst_i(rst_i),
  .dat_i(dat_i),
  .dat_o(dat_o),
  .dat_valid_i(dat_valid),
  .dat_valid_o()
);

string filename;
initial begin
`ifdef DUMP_FILE_NAME
  filename=`DUMP_FILE_NAME;
`else
  filename="ser_to_par.lxt2";
`endif
  $dumpfile(filename); $dumpvars();
  clk_i = 0;
  rst_i = 1'b1;
  dat_i = 1'b1;
  dat_valid= 1'b0;
  #1
  rst_i = 0;
  #1
  rst_i = 1;
end

always #10 clk_i = ~clk_i;

initial begin
  #13;
  @(negedge clk_i);

  dat_valid = 1'b1;
  // start data
  dat_i = 1'b0;
  @(negedge clk_i);
  // - 1 clk cycle, 1 bit later:
  dat_i = 1'b1;

  repeat (7) @(negedge clk_i);
  dat_valid = 1'b0;

  // - 7 clk cycle, 7 bits later:
  assert (dat_o == 8'hfe)
  else $error("Excected dat_o to be hfe, was h%x", dat_o);

  @(negedge clk_i);
  $finish();
end

endmodule