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+//======================================================================
+//
+// tb_sha3.v
+// -----------
+// Testbench for the SHA-3 core.
+//
+//
+// Author: Joachim Strombergson, Pernd Paysan
+// Copyright (c) 2015, SUNET
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or
+// without modification, are permitted provided that the following
+// conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in
+// the documentation and/or other materials provided with the
+// distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//======================================================================
+
+//------------------------------------------------------------------
+// Simulator directives.
+//------------------------------------------------------------------
+`timescale 1ns/100ps
+
+
+//------------------------------------------------------------------
+// Test module.
+//------------------------------------------------------------------
+module tb_sha256();
+
+ //----------------------------------------------------------------
+ // Internal constant and parameter definitions.
+ //----------------------------------------------------------------
+ parameter DEBUG = 0;
+
+ parameter CLK_HALF_PERIOD = 2;
+ parameter CLK_PERIOD = 2 * CLK_HALF_PERIOD;
+
+
+ //----------------------------------------------------------------
+ // Register and Wire declarations.
+ //----------------------------------------------------------------
+ reg [31 : 0] cycle_ctr;
+ reg [31 : 0] error_ctr;
+ reg [31 : 0] tc_ctr;
+
+ reg tb_clk;
+ reg tb_reset_n;
+ reg tb_cs;
+ reg tb_we;
+ reg [7 : 0] tb_address;
+ reg [31 : 0] tb_write_data;
+ wire [31 : 0] tb_read_data;
+ wire tb_error;
+
+ reg [31 : 0] read_data;
+ reg [255 : 0] digest_data;
+
+
+ //----------------------------------------------------------------
+ // Device Under Test.
+ //----------------------------------------------------------------
+ sha3 dut(
+ .clk(tb_clk),
+ .reset_n(tb_reset_n),
+
+ .cs(tb_cs),
+ .we(tb_we),
+
+
+ .address(tb_address),
+ .write_data(tb_write_data),
+ .read_data(tb_read_data),
+ .error(tb_error)
+ );
+
+
+ //----------------------------------------------------------------
+ // clk_gen
+ //
+ // Clock generator process.
+ //----------------------------------------------------------------
+ always
+ begin : clk_gen
+ #CLK_HALF_PERIOD tb_clk = !tb_clk;
+ end // clk_gen
+
+
+ //----------------------------------------------------------------
+ // sys_monitor
+ //
+ // Generates a cycle counter and displays information about
+ // the dut as needed.
+ //----------------------------------------------------------------
+ always
+ begin : sys_monitor
+ #(2 * CLK_HALF_PERIOD);
+ cycle_ctr = cycle_ctr + 1;
+ end
+
+
+ //----------------------------------------------------------------
+ // reset_dut()
+ //
+ // Toggles reset to force the DUT into a well defined state.
+ //----------------------------------------------------------------
+ task reset_dut();
+ begin
+ $display("*** Toggle reset.");
+ tb_reset_n = 0;
+ #(4 * CLK_HALF_PERIOD);
+ tb_reset_n = 1;
+ end
+ endtask // reset_dut
+
+
+ //----------------------------------------------------------------
+ // init_sim()
+ //
+ // Initialize all counters and testbed functionality as well
+ // as setting the DUT inputs to defined values.
+ //----------------------------------------------------------------
+ task init_sim();
+ begin
+ cycle_ctr = 32'h00000000;
+ error_ctr = 32'h00000000;
+ tc_ctr = 32'h00000000;
+
+ tb_clk = 0;
+ tb_reset_n = 0;
+ tb_cs = 0;
+ tb_we = 0;
+ tb_address = 6'h00;
+ tb_write_data = 32'h00000000;
+ end
+ endtask // init_dut
+
+
+ //----------------------------------------------------------------
+ // display_test_result()
+ //
+ // Display the accumulated test results.
+ //----------------------------------------------------------------
+ task display_test_result();
+ begin
+ if (error_ctr == 0)
+ begin
+ $display("*** All %02d test cases completed successfully.", tc_ctr);
+ end
+ else
+ begin
+ $display("*** %02d test cases completed.", tc_ctr);
+ $display("*** %02d errors detected during testing.", error_ctr);
+ end
+ end
+ endtask // display_test_result
+
+
+ //----------------------------------------------------------------
+ // wait_ready()
+ //
+ // Wait for the ready flag in the dut to be set.
+ // (Actually we wait for either ready or valid 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_ready();
+ begin
+ read_data = 0;
+
+ while (read_data == 0)
+ begin
+ read_word(ADDR_STATUS);
+ end
+ end
+ endtask // wait_ready
+
+
+ //----------------------------------------------------------------
+ // single_block_test()
+ //
+ //
+ // Perform test of a single block digest.
+ //----------------------------------------------------------------
+ task single_block_test(input [511 : 0] block,
+ input [255 : 0] expected);
+ begin
+ $display("*** TC%01d - Single block test started.", tc_ctr);
+
+ $display("*** TC%01d - Single block test done.", tc_ctr);
+ tc_ctr = tc_ctr + 1;
+ end
+ endtask // single_block_test
+
+
+ //----------------------------------------------------------------
+ // double_block_test()
+ //
+ //
+ // Perform test of a double block digest. Note that we check
+ // the digests for both the first and final block.
+ //----------------------------------------------------------------
+ task double_block_test(input [511 : 0] block0,
+ input [255 : 0] expected0,
+ input [511 : 0] block1,
+ input [255 : 0] expected1
+ );
+ begin
+ $display("*** TC%01d - Double block test started.", tc_ctr);
+
+ $display("*** TC%01d - Double block test done.", tc_ctr);
+ tc_ctr = tc_ctr + 1;
+ end
+ endtask // double_block_test
+
+
+ //----------------------------------------------------------------
+ // sha3_test
+ // The main test functionality.
+ //----------------------------------------------------------------
+ initial
+ begin : sha3_test
+ reg [511 : 0] tc0;
+ reg [255 : 0] res0;
+
+ reg [511 : 0] tc1_0;
+ reg [255 : 0] res1_0;
+ reg [511 : 0] tc1_1;
+ reg [255 : 0] res1_1;
+
+ $display(" -- Testbench for sha3 started --");
+
+ init_sim();
+ reset_dut();
+
+ $display(" -- Testbench for sha3 done. --");
+ $finish;
+ end // sha3_test
+endmodule // tb_sha3
+
+//======================================================================
+// EOF tb_sha3.v
+//======================================================================