From fbcbd4218e2711da279d8097620a5b26637bf45b Mon Sep 17 00:00:00 2001 From: "Pavel V. Shatov (Meister)" Date: Wed, 19 Dec 2018 15:27:04 +0300 Subject: Added primitives with clock enable ports. Added primitives from ModExp. --- bench/tb_lowlevel_subtractor32.v | 174 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 174 insertions(+) create mode 100644 bench/tb_lowlevel_subtractor32.v (limited to 'bench/tb_lowlevel_subtractor32.v') diff --git a/bench/tb_lowlevel_subtractor32.v b/bench/tb_lowlevel_subtractor32.v new file mode 100644 index 0000000..fd96000 --- /dev/null +++ b/bench/tb_lowlevel_subtractor32.v @@ -0,0 +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 +//------------------------------------------------------------------------------ -- cgit v1.2.3