From 6c83fd8730e55de8b1daaac1deb111d3d9bd408e Mon Sep 17 00:00:00 2001
From: uvok
Date: Fri, 9 Jan 2026 15:18:23 +0100
Subject: move stuff around

---
 playground/fizzbuzz_tb.v | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 playground/fizzbuzz_tb.v

(limited to 'playground/fizzbuzz_tb.v')

diff --git a/playground/fizzbuzz_tb.v b/playground/fizzbuzz_tb.v
new file mode 100644
index 0000000..4d612ec
--- /dev/null
+++ b/playground/fizzbuzz_tb.v
@@ -0,0 +1,48 @@
+`timescale 1us/1us
+
+module fizzbuzz_tb;
+
+
+logic [7:0] number;
+logic clk_i;
+
+logic [7:0] num_out;
+
+fizzbuzz uut (
+  .num_i(number),
+  .num_o(num_out),
+  .fizz_o(),
+  .buzz_o(),
+  .fizzbuzz_o()
+);
+
+string filename;
+initial begin
+`ifdef DUMP_FILE_NAME
+  filename=`DUMP_FILE_NAME;
+`else
+  filename="fizzbuzz.lxt2";
+`endif
+  $dumpfile(filename); $dumpvars();
+
+
+  clk_i = 0;
+  number = '0;
+end
+
+always #10 begin
+  clk_i = ~clk_i;
+end
+
+always @(negedge clk_i) begin
+  number <= number + 1;
+  // give iverilog some simulation time...
+  #1;
+  if (number == 3) assert(num_out == 0);
+  if (number == 5) assert(num_out == 0);
+  if (number == 15) assert(num_out == 0);
+
+  if (number == 255) $finish;
+end
+
+endmodule
-- 
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