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Diffstat (limited to 'src/tb/tb_n_coeff.v')
| -rw-r--r-- | src/tb/tb_n_coeff.v | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/src/tb/tb_n_coeff.v b/src/tb/tb_n_coeff.v new file mode 100644 index 0000000..6ab824a --- /dev/null +++ b/src/tb/tb_n_coeff.v @@ -0,0 +1,292 @@ +//======================================================================
+//
+// tb_n_coeff.v
+// -----------------------------------------------------------------------------
+// Testbench for Montgomery modulus-depentent coefficient calculation block.
+//
+// Authors: Pavel Shatov
+//
+// Copyright (c) 2017, NORDUnet A/S All rights reserved.
+//
+// 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_n_coeff;
+
+ //
+ // Test Vectors
+ //
+ `include "../modexp_fpga_model_vectors.v";
+
+ //
+ // Parameters
+ //
+ localparam NUM_WORDS_384 = 384 / 32;
+
+ //
+ // Clock (100 MHz)
+ //
+ reg clk = 1'b0;
+ always #5 clk = ~clk;
+
+ //
+ // Inputs-
+ //
+ reg rst_n;
+ reg ena;
+
+ reg [ 3: 0] n_num_words;
+
+ //
+ // Outputs
+ //
+ wire rdy;
+
+ //
+ // Integers
+ //
+ integer w;
+
+ //
+ // BRAM Interfaces
+ //
+ wire [ 3: 0] core_n_addr;
+ wire [ 3: 0] core_n_coeff_addr;
+
+ wire [31: 0] core_n_data;
+ wire [31: 0] core_n_coeff_data_in;
+
+ wire core_n_coeff_wren;
+
+ reg [ 3: 0] tb_n_addr; + reg [ 3: 0] tb_n_coeff_addr; +
+ reg [31:0] tb_n_data; + wire [31:0] tb_n_coeff_data; + + reg tb_n_wren; +
+ //
+ // BRAMs
+ //
+ bram_1rw_1ro_readfirst #(.MEM_WIDTH(32), .MEM_ADDR_BITS(4)) + bram_n (.clk(clk),
+ .a_addr(tb_n_addr), .a_wr(tb_n_wren), .a_in(tb_n_data), .a_out(), + .b_addr(core_n_addr), .b_out(core_n_data)); +
+ bram_1rw_1ro_readfirst #(.MEM_WIDTH(32), .MEM_ADDR_BITS(4)) + bram_n_coeff (.clk(clk),
+ .a_addr(core_n_coeff_addr), .a_wr(core_n_coeff_wren), .a_in(core_n_coeff_data_in), .a_out(), + .b_addr(tb_n_coeff_addr), .b_out(tb_n_coeff_data)); +
+ //
+ // UUT
+ //
+ modexpa7_n_coeff #
+ (
+ .OPERAND_ADDR_WIDTH (4) // 32 * (2**4) = 512-bit operands
+ )
+ uut
+ (
+ .clk (clk),
+ .rst_n (rst_n),
+
+ .ena (ena),
+ .rdy (rdy),
+
+ .n_bram_addr (core_n_addr),
+ .n_coeff_bram_addr (core_n_coeff_addr),
+
+ .n_bram_out (core_n_data),
+
+ .n_coeff_bram_in (core_n_coeff_data_in),
+ .n_coeff_bram_wr (core_n_coeff_wren),
+
+ .n_num_words (n_num_words)
+ );
+
+
+ //
+ // Script
+ //
+ initial begin
+
+ rst_n = 1'b0;
+ ena = 1'b0;
+
+ #200;
+ rst_n = 1'b1;
+ #100;
+
+ test_n_coeff_384(N_384);
+
+ end
+
+
+ //
+ // Test Tasks
+ //
+
+ task test_n_coeff_384; + input [383:0] n;
+ reg [383:0] n_coeff;
+ reg [383:0] result;
+ integer i; + begin
+
+ calc_n_coeff_384(n, n_coeff); // calculate n_coeff on-the-fly
+
+ // make sure, that the value matches the one saved in the include file
+ if (n_coeff !== N_COEFF_384) begin
+ $display("ERROR: Calculated factor value differs from the one in the test vector!");
+ $finish;
+ end
+
+
+ n_num_words = 4'd11; // set number of words +
+ write_memory_384(n); // fill memory
+ + ena = 1; // start operation + #10; //
+ ena = 0; // clear flag
+ + while (!rdy) #10; // wait for operation to complete
+ read_memory_384(result); // get result from memory +
+ $display(" calculated: %x", result); //
+ $display(" expected: %x", n_coeff); //
+
+ // check calculated value
+ if (n_coeff === result) begin + $display(" OK");
+ $display("SUCCESS: Test passed."); + end else begin
+ $display(" ERROR");
+ $display("FAILURE: Test not passed.");
+ end
+
+ end +
+ endtask +
+
+ task write_memory_384;
+
+ input [383:0] n;
+
+ reg [383:0] n_shreg;
+
+ begin +
+ tb_n_wren = 1; // start filling memories + + n_shreg = n; //
+ + for (w=0; w<NUM_WORDS_384; w=w+1) begin // write all words + + tb_n_addr = w[3:0]; // set addresses + + tb_n_data = n_shreg[31:0]; //
+ + n_shreg = {{32{1'bX}}, n_shreg[383:32]}; //
+ + #10; // wait for 1 clock tick + + end + + tb_n_addr = {4{1'bX}}; // wipe addresses + + tb_n_data = {32{1'bX}}; //
+ + tb_n_wren = 0; // stop filling memories
+
+ end
+
+ endtask + +
+ task read_memory_384;
+
+ output [383:0] n_coeff;
+ reg [383:0] n_coeff_shreg;
+
+ begin
+
+ // read result word-by-word
+ for (w=0; w<NUM_WORDS_384; w=w+1) begin + tb_n_coeff_addr = w[3:0]; // set address + #10; // wait for 1 clock tick + n_coeff_shreg = {tb_n_coeff_data, n_coeff_shreg[383:32]}; // store data word + end
+
+ tb_n_coeff_addr = {4{1'bX}}; // wipe address
+ n_coeff = n_coeff_shreg; // return
+
+ end
+
+ endtask +
+
+ task calc_n_coeff_384;
+
+ input [383:0] n;
+ output [383:0] n_coeff;
+ reg [383:0] r;
+ reg [383:0] nn;
+ reg [383:0] t;
+ reg [383:0] b;
+ integer i;
+
+ begin
+
+ r = 384'd1;
+ b = 384'd1;
+ nn = ~n + 1'b1;
+
+ for (i=1; i<384; i=i+1) begin
+ b = {b[382:0], 1'b0};
+ t = r * nn;
+ if (t[i] == 1'b1)
+ r = r + b;
+ end
+
+ n_coeff = r;
+
+ end
+
+ endtask +
+
+endmodule
+
+//======================================================================
+// End of file
+//======================================================================
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