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-\m4_TLV_version 1b: tl-x.org
-\SV
-/*
-Copyright (c) 2014, Steven F. Hoover
-
-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.
- * The name of Steven F. Hoover
- may not 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 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.
-*/
-
-module pseudo_rand
- #(parameter WIDTH=257) // Random vector width, to a max of 257.
- (input logic clk,
- input logic reset,
- output logic [WIDTH-1:0] rand_vect
- );
-
-// Currently, this implements a Galois LFSR.
-// TODO: It should be XORed with something else so it doesn't just shift.
-// Using polynomials with maximal number of taps would have less regular shifting behavior.
-
-// Bits are numbered in the reverse of the traditional order. This puts the taps in the lower bit positions.
-
-// Choose optimal parameters for given WIDTH.
-localparam LFSR_WIDTH =
- (WIDTH <= 64) ? 64 :
- (WIDTH <= 128) ? 128 :
- (WIDTH <= 257) ? 257 : 0; // 257 enables a large non-power of two for replication on an irregular boundary.
-// Polynomial source: http://www.eej.ulst.ac.uk/~ian/modules/EEE515/files/old_files/lfsr/lfsr_table.pdf
-localparam [LFSR_WIDTH-1:0] LFSR_POLY = {{(LFSR_WIDTH-8){1'b0}},
- (LFSR_WIDTH == 64) ? 8'b00011011 :
- (LFSR_WIDTH == 128) ? 8'b10000111 :
- (LFSR_WIDTH == 257) ? 8'b11000101 : 8'b0};
-
-bit [256:0] SEED = 257'h0_7163e168_713d5431_6684e132_5cd84848_f3048b46_76874654_0c45f864_04e4684a;
-
-
-
-\TLV
- |default
- @0
- $reset = reset;
- @1
- $lfsr[LFSR_WIDTH-1:0] = $reset ? *SEED : {$lfsr#+1[LFSR_WIDTH-2:0], 1'b0} ^ ({LFSR_WIDTH{$lfsr#+1[LFSR_WIDTH-1]}} & *LFSR_POLY);
- @2
- *rand_vect = $lfsr[WIDTH-1:0];
-
-\SV
-
-endmodule