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-rw-r--r--nandgame/arith_unit.sv5
1 files changed, 5 insertions, 0 deletions
diff --git a/nandgame/arith_unit.sv b/nandgame/arith_unit.sv
index b85d6d6..e0254aa 100644
--- a/nandgame/arith_unit.sv
+++ b/nandgame/arith_unit.sv
@@ -4,6 +4,9 @@
`include "nandgame_types.v"
+`ifndef NANDGAME_ARU
+`define NANDGAME_ARU
+
module arith_unit #(
parameter DATA_WIDTH = 16
) (
@@ -25,3 +28,5 @@ always_comb begin
end
endmodule
+
+`endif