From 20fd019f0cf4c9110f44e46ff7820dd37598e164 Mon Sep 17 00:00:00 2001
From: uvok
Date: Thu, 1 Jan 2026 15:44:40 +0100
Subject: Add arithmetic unit, disable gtkwave

---
 nandgame/arith_unit_tb.sv | 71 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 nandgame/arith_unit_tb.sv

(limited to 'nandgame/arith_unit_tb.sv')

diff --git a/nandgame/arith_unit_tb.sv b/nandgame/arith_unit_tb.sv
new file mode 100644
index 0000000..054e484
--- /dev/null
+++ b/nandgame/arith_unit_tb.sv
@@ -0,0 +1,71 @@
+`timescale 1us/1us
+
+// `include "nandgame_types.v"
+
+module  arith_unit_tb (
+);
+
+logic [15:0] in1;
+logic [15:0] in2;
+ArithCode opcode;
+logic [15:0] result;
+
+ arith_unit uut (
+  .X(in1),
+  .Y(in2),
+  .operation(opcode),
+  .RES(result)
+);
+
+string filename;
+initial begin
+`ifdef DUMP_FILE_NAME
+  filename=`DUMP_FILE_NAME;
+`else
+  filename=" arith_unit.lxt2";
+`endif
+  $dumpfile(filename); $dumpvars();
+
+end
+
+initial begin
+  in1 = 13;
+  in2 = 17;
+  opcode = ARITH_PLUS;
+  #1
+  assert(result == 30);
+  #1
+  in1 = 12;
+  in2 = 4;
+  opcode = ARITH_MINUS;
+  #1
+  assert(result == 8);
+  #1
+  in1 = 12;
+  in2 = 13;
+  opcode = ARITH_MINUS;
+  #1
+  assert(result == 16'hffff);
+  #1
+  in1 = 13;
+  in2 = 17;
+  opcode = ARITH_INC;
+  #1
+  assert(result == 14);
+  #1
+  in1 = 13;
+  in2 = 17;
+  opcode = ARITH_DEC;
+  #1
+  assert(result == 12);
+  #1
+  in1 = 0;
+  in2 = 17;
+  opcode = ARITH_DEC;
+  #1
+  assert(result == 16'hffff);
+  #1
+  $finish();
+end
+
+endmodule
-- 
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