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diff --git a/nandgame/logic_unit.sv b/nandgame/logic_unit.sv
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+// nandgame logic unit
+
+`timescale 1us/1us
+
+`include "nandgame_types.v"
+
+module logic_unit #(
+  parameter DATA_WIDTH = 16
+) (
+  input [(DATA_WIDTH-1):0] X,
+  input [(DATA_WIDTH-1):0] Y,
+  input LogicCode operation,
+
+  output logic [(DATA_WIDTH-1):0] RES
+);
+
+// assign RES = operation == LOGIC_AND ? (X & Y) : 
+//               operation == LOGIC_OR ? (X | Y) :
+//               operation == LOGIC_XOR ? (X ^ Y) :
+//               operation == LOGIC_NEGT ? (~X) : 0;
+
+always_comb begin
+    case (operation)
+        LOGIC_AND: RES = X & Y;
+        LOGIC_OR:  RES = X | Y;
+        LOGIC_XOR: RES = X ^ Y;
+        LOGIC_NEGT: RES = ~X;
+        default: RES = 0;
+    endcase
+end
+
+endmodule