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-rw-r--r--bench/tb_lowlevel_subtractor32.v348
1 files changed, 174 insertions, 174 deletions
diff --git a/bench/tb_lowlevel_subtractor32.v b/bench/tb_lowlevel_subtractor32.v
index e1129e2..fd96000 100644
--- a/bench/tb_lowlevel_subtractor32.v
+++ b/bench/tb_lowlevel_subtractor32.v
@@ -1,174 +1,174 @@
-//------------------------------------------------------------------------------
-//
-// tb_lowlevel_subtractor32.v
-// -----------------------------------------------------------------------------
-// Testbench for 32-bit subtractor.
-//
-// Authors: Pavel Shatov
-//
-// Copyright (c) 2015-2016, NORDUnet A/S
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-// - Redistributions of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimer.
-//
-// - 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.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may be
-// used to endorse or promote products derived from this software without
-// specific prior written permission.
-//
-// 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 HOLDER 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.
-//
-//------------------------------------------------------------------------------
-
-
-//------------------------------------------------------------------------------
-`timescale 1ns / 1ps
-//------------------------------------------------------------------------------
-
-module tb_lowlevel_subtractor32;
-
- //
- // Inputs
- //
- reg clk;
- reg [31: 0] a;
- reg [31: 0] b;
- reg b_in;
-
- //
- // Outputs
- //
- wire [31: 0] d;
- wire b_out;
-
- //
- // Test Vectors {a, b, b_in}
- //
- wire [64: 0] vec_0 = {32'h00000000, 32'h00000000, 1'b0}; // all zeroes, no borrow
- wire [64: 0] vec_1 = {32'h00000000, 32'h00000000, 1'b1}; // all zeroes with borrow
- wire [64: 0] vec_2 = {32'h00000000, 32'hFFFFFFFF, 1'b0}; // zeroes and ones, no borrow
- wire [64: 0] vec_3 = {32'h00000000, 32'hFFFFFFFF, 1'b1}; // zeroes and ones with borrow
- wire [64: 0] vec_4 = {32'hFFFFFFFF, 32'h00000000, 1'b0}; // ones and zeroes, no borrow
- wire [64: 0] vec_5 = {32'hFFFFFFFF, 32'h00000000, 1'b1}; // ones and zeroes with borrow
- wire [64: 0] vec_6 = {32'hFFFFFFFF, 32'hFFFFFFFF, 1'b0}; // all ones, no borrow
- wire [64: 0] vec_7 = {32'hFFFFFFFF, 32'hFFFFFFFF, 1'b1}; // all ones with borrow
-
- wire [64: 0] vec_8 = {32'hd898c296, 32'h37bf51f5, 1'b0}; // random values, no borrow
- wire [64: 0] vec_9 = {32'hf4a13945, 32'hcbb64068, 1'b0}; // random values, no borrow
- wire [64: 0] vec_10 = {32'h2deb33a0, 32'h6b315ece, 1'b0}; // random values, no borrow
- wire [64: 0] vec_11 = {32'h77037d81, 32'h2bce3357, 1'b0}; // random values, no borrow
- wire [64: 0] vec_12 = {32'h63a440f2, 32'h7c0f9e16, 1'b1}; // random values with borrow
- wire [64: 0] vec_13 = {32'hf8bce6e5, 32'h8ee7eb4a, 1'b1}; // random values with borrow
- wire [64: 0] vec_14 = {32'he12c4247, 32'hfe1a7f9b, 1'b1}; // random values with borrow
- wire [64: 0] vec_15 = {32'h6b17d1f2, 32'h4fe342e2, 1'b1}; // random values with borrow
-
-
- //
- // UUT
- //
- subtractor32_wrapper uut
- (
- .clk (clk),
- .a (a),
- .b (b),
- .d (d),
- .b_in (b_in),
- .b_out (b_out)
- );
-
-
- //
- // Testbench Routine
- //
- reg ok = 1;
- initial begin
- //
- clk = 0;
- //
- #100;
- //
- test_subtractor32(vec_0);
- test_subtractor32(vec_1);
- test_subtractor32(vec_2);
- test_subtractor32(vec_3);
- test_subtractor32(vec_4);
- test_subtractor32(vec_5);
- test_subtractor32(vec_6);
- test_subtractor32(vec_7);
- //
- test_subtractor32(vec_8);
- test_subtractor32(vec_9);
- test_subtractor32(vec_10);
- test_subtractor32(vec_11);
- test_subtractor32(vec_12);
- test_subtractor32(vec_13);
- test_subtractor32(vec_14);
- test_subtractor32(vec_15);
- //
- if (ok) $display("tb_lowlevel_subtractor32: SUCCESS");
- else $display("tb_lowlevel_subtractor32: FAILURE");
- //
- $finish;
- //
- end
-
-
- //
- // Test Routine
- //
- reg [31: 0] dd; // reference value of difference
- reg bb; // reference value of borrow
- reg dd_ok; // result matches reference value
-
- task test_subtractor32;
-
- input [64: 0] vec;
-
- begin
-
- /* break down test vector */
- a = vec[64:33];
- b = vec[32: 1];
- b_in = vec[ 0: 0];
-
- /* calculate reference values */
- {bb, dd} = {1'b0, a} - {1'b0, b} - {32'd0, b_in};
-
- /* send one clock tick */
- #10 clk = 1;
- #10 clk = 0;
-
- /* check outputs */
- dd_ok = (d == dd) && (b_out == bb);
-
- /* display results */
- $display("test_subtractor32(): 0x%08X - (0x%08X + %01d) = {%01d, 0x%08X} [%0s]", a, b, b_in, b_out, d, dd_ok ? "OK" : "ERROR");
-
- /* update global flag */
- ok = ok && dd_ok;
-
- end
-
- endtask
-
-endmodule
-
-//------------------------------------------------------------------------------
-// End-of-File
-//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//
+// tb_lowlevel_subtractor32.v
+// -----------------------------------------------------------------------------
+// Testbench for 32-bit subtractor.
+//
+// Authors: Pavel Shatov
+//
+// Copyright (c) 2015-2016, NORDUnet A/S
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// - Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+//
+// - 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.
+//
+// - Neither the name of the NORDUnet nor the names of its contributors may be
+// used to endorse or promote products derived from this software without
+// specific prior written permission.
+//
+// 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 HOLDER 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.
+//
+//------------------------------------------------------------------------------
+
+
+//------------------------------------------------------------------------------
+`timescale 1ns / 1ps
+//------------------------------------------------------------------------------
+
+module tb_lowlevel_subtractor32;
+
+ //
+ // Inputs
+ //
+ reg clk;
+ reg [31: 0] a;
+ reg [31: 0] b;
+ reg b_in;
+
+ //
+ // Outputs
+ //
+ wire [31: 0] d;
+ wire b_out;
+
+ //
+ // Test Vectors {a, b, b_in}
+ //
+ wire [64: 0] vec_0 = {32'h00000000, 32'h00000000, 1'b0}; // all zeroes, no borrow
+ wire [64: 0] vec_1 = {32'h00000000, 32'h00000000, 1'b1}; // all zeroes with borrow
+ wire [64: 0] vec_2 = {32'h00000000, 32'hFFFFFFFF, 1'b0}; // zeroes and ones, no borrow
+ wire [64: 0] vec_3 = {32'h00000000, 32'hFFFFFFFF, 1'b1}; // zeroes and ones with borrow
+ wire [64: 0] vec_4 = {32'hFFFFFFFF, 32'h00000000, 1'b0}; // ones and zeroes, no borrow
+ wire [64: 0] vec_5 = {32'hFFFFFFFF, 32'h00000000, 1'b1}; // ones and zeroes with borrow
+ wire [64: 0] vec_6 = {32'hFFFFFFFF, 32'hFFFFFFFF, 1'b0}; // all ones, no borrow
+ wire [64: 0] vec_7 = {32'hFFFFFFFF, 32'hFFFFFFFF, 1'b1}; // all ones with borrow
+
+ wire [64: 0] vec_8 = {32'hd898c296, 32'h37bf51f5, 1'b0}; // random values, no borrow
+ wire [64: 0] vec_9 = {32'hf4a13945, 32'hcbb64068, 1'b0}; // random values, no borrow
+ wire [64: 0] vec_10 = {32'h2deb33a0, 32'h6b315ece, 1'b0}; // random values, no borrow
+ wire [64: 0] vec_11 = {32'h77037d81, 32'h2bce3357, 1'b0}; // random values, no borrow
+ wire [64: 0] vec_12 = {32'h63a440f2, 32'h7c0f9e16, 1'b1}; // random values with borrow
+ wire [64: 0] vec_13 = {32'hf8bce6e5, 32'h8ee7eb4a, 1'b1}; // random values with borrow
+ wire [64: 0] vec_14 = {32'he12c4247, 32'hfe1a7f9b, 1'b1}; // random values with borrow
+ wire [64: 0] vec_15 = {32'h6b17d1f2, 32'h4fe342e2, 1'b1}; // random values with borrow
+
+
+ //
+ // UUT
+ //
+ subtractor32_wrapper uut
+ (
+ .clk (clk),
+ .a (a),
+ .b (b),
+ .d (d),
+ .b_in (b_in),
+ .b_out (b_out)
+ );
+
+
+ //
+ // Testbench Routine
+ //
+ reg ok = 1;
+ initial begin
+ //
+ clk = 0;
+ //
+ #100;
+ //
+ test_subtractor32(vec_0);
+ test_subtractor32(vec_1);
+ test_subtractor32(vec_2);
+ test_subtractor32(vec_3);
+ test_subtractor32(vec_4);
+ test_subtractor32(vec_5);
+ test_subtractor32(vec_6);
+ test_subtractor32(vec_7);
+ //
+ test_subtractor32(vec_8);
+ test_subtractor32(vec_9);
+ test_subtractor32(vec_10);
+ test_subtractor32(vec_11);
+ test_subtractor32(vec_12);
+ test_subtractor32(vec_13);
+ test_subtractor32(vec_14);
+ test_subtractor32(vec_15);
+ //
+ if (ok) $display("tb_lowlevel_subtractor32: SUCCESS");
+ else $display("tb_lowlevel_subtractor32: FAILURE");
+ //
+ $finish;
+ //
+ end
+
+
+ //
+ // Test Routine
+ //
+ reg [31: 0] dd; // reference value of difference
+ reg bb; // reference value of borrow
+ reg dd_ok; // result matches reference value
+
+ task test_subtractor32;
+
+ input [64: 0] vec;
+
+ begin
+
+ /* break down test vector */
+ a = vec[64:33];
+ b = vec[32: 1];
+ b_in = vec[ 0: 0];
+
+ /* calculate reference values */
+ {bb, dd} = {1'b0, a} - {1'b0, b} - {32'd0, b_in};
+
+ /* send one clock tick */
+ #10 clk = 1;
+ #10 clk = 0;
+
+ /* check outputs */
+ dd_ok = (d == dd) && (b_out == bb);
+
+ /* display results */
+ $display("test_subtractor32(): 0x%08X - (0x%08X + %01d) = {%01d, 0x%08X} [%0s]", a, b, b_in, b_out, d, dd_ok ? "OK" : "ERROR");
+
+ /* update global flag */
+ ok = ok && dd_ok;
+
+ end
+
+ endtask
+
+endmodule
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
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