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[/] [xmatchpro/] [trunk/] [xmw4-comdec/] [xmatch_sim7/] [ipcore_dir/] [fifo_32x512/] [simulation/] [fifo_32x512_rng.vhd] - Rev 9
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-------------------------------------------------------------------------------- -- -- FIFO Generator Core Demo Testbench -- -------------------------------------------------------------------------------- -- -- (c) Copyright 2009 - 2010 Xilinx, Inc. All rights reserved. -- -- This file contains confidential and proprietary information -- of Xilinx, Inc. and is protected under U.S. and -- international copyright and other intellectual property -- laws. -- -- DISCLAIMER -- This disclaimer is not a license and does not grant any -- rights to the materials distributed herewith. Except as -- otherwise provided in a valid license issued to you by -- Xilinx, and to the maximum extent permitted by applicable -- law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND -- WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES -- AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING -- BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON- -- INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and -- (2) Xilinx shall not be liable (whether in contract or tort, -- including negligence, or under any other theory of -- liability) for any loss or damage of any kind or nature -- related to, arising under or in connection with these -- materials, including for any direct, or any indirect, -- special, incidental, or consequential loss or damage -- (including loss of data, profits, goodwill, or any type of -- loss or damage suffered as a result of any action brought -- by a third party) even if such damage or loss was -- reasonably foreseeable or Xilinx had been advised of the -- possibility of the same. -- -- CRITICAL APPLICATIONS -- Xilinx products are not designed or intended to be fail- -- safe, or for use in any application requiring fail-safe -- performance, such as life-support or safety devices or -- systems, Class III medical devices, nuclear facilities, -- applications related to the deployment of airbags, or any -- other applications that could lead to death, personal -- injury, or severe property or environmental damage -- (individually and collectively, "Critical -- Applications"). Customer assumes the sole risk and -- liability of any use of Xilinx products in Critical -- Applications, subject only to applicable laws and -- regulations governing limitations on product liability. -- -- THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS -- PART OF THIS FILE AT ALL TIMES. -------------------------------------------------------------------------------- -- -- Filename: fifo_32x512_rng.vhd -- -- Description: -- Used for generation of pseudo random numbers -- -------------------------------------------------------------------------------- -- Library Declarations -------------------------------------------------------------------------------- LIBRARY ieee; USE ieee.std_logic_1164.ALL; USE ieee.std_logic_unsigned.all; USE IEEE.std_logic_arith.all; USE IEEE.std_logic_misc.all; ENTITY fifo_32x512_rng IS GENERIC ( WIDTH : integer := 8; SEED : integer := 3); PORT ( CLK : IN STD_LOGIC; RESET : IN STD_LOGIC; ENABLE : IN STD_LOGIC; RANDOM_NUM : OUT STD_LOGIC_VECTOR (WIDTH-1 DOWNTO 0)); END ENTITY; ARCHITECTURE rg_arch OF fifo_32x512_rng IS BEGIN PROCESS (CLK,RESET) VARIABLE rand_temp : STD_LOGIC_VECTOR(width-1 DOWNTO 0):=conv_std_logic_vector(SEED,width); VARIABLE temp : STD_LOGIC := '0'; BEGIN IF(RESET = '1') THEN rand_temp := conv_std_logic_vector(SEED,width); temp := '0'; ELSIF (CLK'event AND CLK = '1') THEN IF (ENABLE = '1') THEN temp := rand_temp(width-1) xnor rand_temp(width-3) xnor rand_temp(width-4) xnor rand_temp(width-5); rand_temp(width-1 DOWNTO 1) := rand_temp(width-2 DOWNTO 0); rand_temp(0) := temp; END IF; END IF; RANDOM_NUM <= rand_temp; END PROCESS; END ARCHITECTURE;