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-rw-r--r--nandgame/nandgame_types.v5
1 files changed, 5 insertions, 0 deletions
diff --git a/nandgame/nandgame_types.v b/nandgame/nandgame_types.v
index 80e9375..f7273da 100644
--- a/nandgame/nandgame_types.v
+++ b/nandgame/nandgame_types.v
@@ -1,3 +1,6 @@
+`ifndef NANDGAME_TYPES_SV
+`define NANDGAME_TYPES_SV
+
typedef enum logic [1:0] {
LOGIC_AND = 2'b00,
LOGIC_OR = 2'b01,
@@ -11,3 +14,5 @@ typedef enum logic [1:0] {
ARITH_MINUS = 2'b10,
ARITH_DEC = 2'b11
} ArithCode;
+
+`endif