From 0165294513694ed208c44231992bf5e7f1676246 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joachim=20Stro=CC=88mbergson?= <joachim@secworks.se>
Date: Fri, 17 Jul 2015 08:55:43 +0200
Subject: Fixed state restore testcase in core testbench. Fixed the double
 block test case to really test the core. Added data valid task.

---
 src/tb/tb_sha256_core.v | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/src/tb/tb_sha256_core.v b/src/tb/tb_sha256_core.v
index 5527bf5..1b1c6ed 100644
--- a/src/tb/tb_sha256_core.v
+++ b/src/tb/tb_sha256_core.v
@@ -295,6 +295,25 @@ module tb_sha256_core();
   endtask // wait_ready
 
 
+  //----------------------------------------------------------------
+  // wait_data_valid()
+  //
+  // Wait for the data valid in th dut to be set.
+  //
+  // Note: It is the callers responsibility to call the function
+  // when the dut is actively processing and will in fact at some
+  // point set the flag.
+  //----------------------------------------------------------------
+  task wait_data_valid();
+    begin
+      while (!tb_digest_valid)
+        begin
+          #(CLK_PERIOD);
+        end
+    end
+  endtask // wait_data_valid
+
+
   //----------------------------------------------------------------
   // single_block_test()
   //
@@ -310,9 +329,9 @@ module tb_sha256_core();
      tb_block = block;
      tb_init = 1;
      #(CLK_PERIOD);
+     tb_init = 0;
      wait_ready();
 
-
      if (tb_digest == expected)
        begin
          $display("*** TC %0d successful.", tc_number);
@@ -354,15 +373,20 @@ module tb_sha256_core();
      tb_block = block1;
      tb_init = 1;
      #(CLK_PERIOD);
+     tb_init = 0;
      wait_ready();
+
      db_digest1 = tb_digest;
      $display("*** TC %0d first block done.", tc_number);
 
      $display("*** TC %0d second block started.", tc_number);
      tb_block = block2;
+     dump_dut_state();
      tb_next = 1;
      #(CLK_PERIOD);
+     tb_next = 0;
      wait_ready();
+
      $display("*** TC %0d second block done.", tc_number);
 
      if (db_digest1 == expected1)
@@ -379,7 +403,7 @@ module tb_sha256_core();
          db_error = 1;
        end
 
-     if (db_digest1 == expected1)
+     if (tb_digest == expected2)
        begin
          $display("*** TC %0d second block successful", tc_number);
          $display("");
@@ -413,7 +437,6 @@ module tb_sha256_core();
                           input [511 : 0] block,
                           input [255 : 0] expected);
 
-     reg [255 : 0] db_digest1;
      reg           db_error;
    begin
      $display("*** TC %0d state restore block test case started.", tc_number);
@@ -463,16 +486,16 @@ module tb_sha256_core();
      tb_state7_we     = 0;
 
      #(CLK_PERIOD);
-     dump_H_state();
 
      $display("*** TC %0d block started.", tc_number);
      tb_block = block;
      tb_next = 1;
      #(CLK_PERIOD);
+     tb_next = 0;
      wait_ready();
      $display("*** TC %0d block done.", tc_number);
 
-     if (db_digest1 == expected)
+     if (tb_digest == expected)
        begin
          $display("*** TC %0d block successful", tc_number);
          $display("");
-- 
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