From ba3d8c0c57d5cb198c94fad6ce5d8dd8ed6a0359 Mon Sep 17 00:00:00 2001
From: uvok
Date: Sat, 27 Dec 2025 10:13:30 +0100
Subject: Implement fizzbuzz

---
 fizzbuzz.tb.v | 35 +++++++++++++++++++++++++++++++++++
 fizzbuzz.v    | 18 ++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 fizzbuzz.tb.v
 create mode 100644 fizzbuzz.v

diff --git a/fizzbuzz.tb.v b/fizzbuzz.tb.v
new file mode 100644
index 0000000..cf31546
--- /dev/null
+++ b/fizzbuzz.tb.v
@@ -0,0 +1,35 @@
+`timescale 1us/1ns
+
+module fizzbuzz_tb (
+);
+
+
+reg [7:0] number = 0;
+wire [7:0] num_out;
+
+fizzbuzz uut(
+  .num_i(number),
+  .num_o(num_out),
+  .fizz_o(),
+  .buzz_o(),
+  .fizzbuzz_o()
+);
+
+initial begin
+  $dumpfile("fizzbuzz.lxt2"); $dumpvars();
+
+end
+
+always #10 begin
+  number <= number + 1;
+  if (number == 3) assert(num_out == 0);
+  if (number == 5) assert(num_out == 0);
+  if (number == 15) assert(num_out == 0);
+end
+
+initial begin
+  #2570
+  $finish();
+end
+
+endmodule
diff --git a/fizzbuzz.v b/fizzbuzz.v
new file mode 100644
index 0000000..e568013
--- /dev/null
+++ b/fizzbuzz.v
@@ -0,0 +1,18 @@
+module fizzbuzz (
+  input [7:0] num_i,
+  output [7:0] num_o,
+  output fizz_o,
+  output buzz_o,
+  output fizzbuzz_o
+);
+
+wire is_fizz, is_buzz;
+assign is_fizz = num_i % 3 == 0;
+assign is_buzz = num_i % 5 == 0;
+
+assign fizz_o = is_fizz && !is_buzz;
+assign buzz_o = !is_fizz && is_buzz;
+assign fizzbuzz_o = is_fizz && is_buzz;
+assign num_o = (is_fizz || is_buzz) ? 0 : num_i;
+
+endmodule
-- 
cgit v1.2.3