From ea26b038d9dcf73354b4803e6e2ea91c8267c75f Mon Sep 17 00:00:00 2001
From: uvok
Date: Thu, 1 Jan 2026 15:58:45 +0100
Subject: add ALU

---
 nandgame/alu.sv | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 nandgame/alu.sv

diff --git a/nandgame/alu.sv b/nandgame/alu.sv
new file mode 100644
index 0000000..0de6546
--- /dev/null
+++ b/nandgame/alu.sv
@@ -0,0 +1,44 @@
+// nandgame ALU
+
+`timescale 1us/1us
+
+`include "nandgame_types.v"
+`include "arith_unit.sv"
+`include "logic_unit.sv"
+
+module  alu #(
+  parameter DATA_WIDTH = 16
+) (
+  input [(DATA_WIDTH-1):0] X,
+  input [(DATA_WIDTH-1):0] Y,
+  input logic u,
+  input logic [1:0] opcode,
+  input logic zx,
+  input logic sw,
+
+  output logic [(DATA_WIDTH-1):0] RES
+);
+
+logic [(DATA_WIDTH-1):0] MyX = zx ? 0 : sw ? Y : X;
+logic [(DATA_WIDTH-1):0] MyY = sw ? X : Y;
+logic [(DATA_WIDTH-1):0] MyResA;
+logic [(DATA_WIDTH-1):0] MyResL;
+
+arith_unit au (
+  .X(MyX),
+  .Y(MyY),
+  .RES(MyResA),
+  .operation(opcode)
+);
+
+logic_unit lu (
+  .X(MyX),
+  .Y(MyY),
+  .RES(MyResL),
+  .operation(opcode)
+);
+
+assign RES = u ? MyResL : MyResA;
+
+
+endmodule
-- 
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