1 files changed, 86 insertions, 0 deletions
diff --git a/sim/testbench_alu.v b/sim/testbench_alu.v
new file mode 100644
index 0000000..7d67d5c
--- /dev/null
+++ b/sim/testbench_alu.v
@@ -0,0 +1,86 @@
+`timescale 1ns / 1ps
+
+module testbench_alu();
+
+  reg reset = 0;
+
+  reg [1023:0] testvec_filename;
+  reg [1023:0] waveform_filename;
+
+  initial begin
+    if ($value$plusargs("testvec=%s", testvec_filename)) begin
+      $display("Using test vector file: %s", testvec_filename);
+    end else begin
+      $display("Error: no test vector file specified.");
+      $finish;
+    end
+
+    if ($value$plusargs("waveform=%s", waveform_filename)) begin
+      $display("Using waveform file: %s", waveform_filename);
+    end else begin
+      $display("Error: no waveform file specified.");
+      $finish;
+    end
+  end
+  
+  initial begin
+    $dumpfile(waveform_filename);
+    $dumpvars(0,testbench_alu);
+  end
+
+  reg clk = 0;
+  always #32 clk = !clk;
+
+
+  reg [31:0] a, b, exp_result;
+  reg [3:0] op;
+  reg [3:0] exp_flags;
+  wire [31:0] result;
+  wire zero, exp_zero;
+
+  assign exp_zero = exp_flags[0];
+
+  reg [31:0] alu_test_count, alu_error_count;
+  reg [103:0] alu_testvec [0:9999];
+
+  initial begin
+    #5;
+    $readmemh(testvec_filename, alu_testvec);
+    alu_test_count = 0;
+    alu_error_count = 0;
+  end
+  
+  always @ (posedge clk) begin
+    #16;
+    {op, a, b, exp_result, exp_flags} = alu_testvec[alu_test_count];
+    #32;
+    if ((result !== exp_result) | (zero !== exp_zero)) begin
+      $display("ERROR (ALU) time: %5d, test: %d", $time, alu_test_count);
+      $display("              op: %b, a: %h b: %h", op, a, b);
+      $display("          result: %h (expected %h)", result, exp_result);
+      $display("            zero: %b (expected %b)", zero, exp_zero);
+      alu_error_count = alu_error_count + 1;
+    end
+
+    alu_test_count = alu_test_count + 1;
+
+    if ((alu_test_count == 9027)) begin
+      $display("FINISHED (ALU), %d tests completed with %d errors", alu_test_count, alu_error_count);
+      #16;
+
+      $finish;
+    end
+  end
+
+  
+  
+
+  alu #(.N(32)) alu (
+    .A(a),
+    .B(b),
+    .OP(op),
+    .RESULT(result),
+    .ZERO(zero)
+  );
+
+endmodule