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-rw-r--r--nandgame/counter.sv5
1 files changed, 5 insertions, 0 deletions
diff --git a/nandgame/counter.sv b/nandgame/counter.sv
index 988d123..90afa9b 100644
--- a/nandgame/counter.sv
+++ b/nandgame/counter.sv
@@ -2,6 +2,9 @@
`timescale 1us/1us
+`ifndef NANDGAME_COUNTER
+`define NANDGAME_COUNTER
+
module counter #(
parameter DATA_WIDTH = 16
) (
@@ -49,3 +52,5 @@ end
assign counter_out = counter_int;
endmodule
+
+`endif