1 files changed, 79 insertions, 0 deletions
diff --git a/par_to_ser_to_ser.tb.v b/par_to_ser_to_ser.tb.v
new file mode 100644
index 0000000..eac1589
--- /dev/null
+++ b/par_to_ser_to_ser.tb.v
@@ -0,0 +1,79 @@
+// converts back and forth
+// parallel > serial > parallel
+
+`timescale 1us/1ns
+
+module par_to_ser_tb (
+);
+
+reg clk_i;
+reg rst_i;
+reg data_valid_i;
+reg [7:0] dat_i;
+wire dat_o;
+wire [7:0] dat_o2;
+
+wire send_valid;
+
+par_to_ser uut(
+  .clk_i(clk_i),
+  .rst_i(rst_i),
+  .data_valid_i(data_valid_i),
+  .dat_i(dat_i),
+  .dat_o(dat_o),
+  .dat_valid_o(send_valid)
+);
+
+ser_to_par uut2(
+  .clk_i(clk_i),
+  .rst_i(rst_i),
+
+  .dat_valid_i(send_valid),
+  .dat_i(dat_o),
+
+  .dat_o(dat_o2),
+  .dat_valid_o()
+);
+
+string filename;
+initial begin
+`ifdef DUMP_FILE_NAME
+  filename=`DUMP_FILE_NAME;
+`else
+  filename="par_to_ser.lxt2";
+`endif
+  $dumpfile(filename); $dumpvars();
+  clk_i <= 0;
+  rst_i <= 1'b1;
+  data_valid_i <= 1'b0;
+
+  #1
+  rst_i <= 1'b0;
+  #1
+  rst_i <= 1'b1;
+end
+
+always #10 clk_i = ~clk_i;
+
+initial begin
+  #37
+
+  for (integer i = 0; i < 255; i++) begin
+    // clock data in
+    dat_i <= i;
+    data_valid_i <= 1'b1;
+
+    // wait 1 cycle
+    #20
+    data_valid_i <= 1'b0;
+
+    // let module do its work
+    #200
+    assert(i == dat_o2);
+
+  end
+
+  $finish();
+end
+
+endmodule