1 files changed, 104 insertions, 0 deletions
diff --git a/sim/testbench_register_file.v b/sim/testbench_register_file.v
new file mode 100644
index 0000000..093a624
--- /dev/null
+++ b/sim/testbench_register_file.v
@@ -0,0 +1,104 @@
+`timescale 1ns / 1ps
+
+module testbench_register_file();
+
+reg clk;
+reg rst;
+reg we;
+reg [4:0] addr_rs0, addr_rs1, addr_rd2;
+reg [31:0] data_rd2;
+wire [31:0] data_rs0, data_rs1;
+
+
+register_file uut (
+  .clk(clk),
+  .rst(rst),
+  .we(we),
+  .addr_rs0(addr_rs0),
+  .addr_rs1(addr_rs1),
+  .addr_rd2(addr_rd2),
+  .data_rs0(data_rs0),
+  .data_rs1(data_rs1),
+  .data_rd2(data_rd2)
+);
+
+integer file, r, eof;
+reg [100*8:1] line;
+reg [31:0] test_count, error_count;
+
+reg [31:0] expected_data_rs0, expected_data_rs1;
+
+always #5 clk = ~clk;
+
+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_register_file);
+  end
+
+
+initial begin
+  clk = 0;
+  rst = 0;
+  we = 0;
+  addr_rs0 = 0;
+  addr_rs1 = 0;
+  addr_rd2 = 0;
+  data_rd2 = 0;
+  
+  test_count = 0;
+  error_count = 0;
+
+  rst = 1;
+  @(posedge clk);
+  rst = 0;
+
+  file = $fopen(testvec_filename, "r");
+  if (file == 0) begin
+    $display("Failed to open testvector file.");
+    $finish;
+  end
+
+  while (!$feof(file)) begin
+    eof = $fgets(line, file);
+    eof = $sscanf(line, "%8h_%8h__%8h_%8h__%8h_%8h_%1h",
+      addr_rs0, expected_data_rs0,
+      addr_rs1, expected_data_rs1,
+      addr_rd2, data_rd2, we);
+    @(posedge clk);
+
+    @(negedge clk);
+    if (data_rs0 !== expected_data_rs0 || data_rs1 !== expected_data_rs1) begin
+      $display("ERROR (register_file) in test %d: addr_rs0: %08h, addr_rs1: %08h, addr_rd2: %08h, data_rd2: %08h, we: %b",
+        test_count, addr_rs0, addr_rs1, addr_rd2, data_rd2, we);
+      $display("      data_rs0: %08h (expected: %08h)", data_rs0, expected_data_rs0);
+      $display("      data_rs1: %08h (expected: %08h)", data_rs1, expected_data_rs1);
+      error_count = error_count + 1;
+    end
+    test_count = test_count + 1;
+  end
+  $display("FINISHED with %d errors out of %d tests", error_count, test_count);
+  $fclose(file);
+  $finish;
+end
+
+endmodule
+