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--

-- FIFO Generator Core Demo Testbench 

--

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--

-- (c) Copyright 2009 - 2010 Xilinx, Inc. All rights reserved.

-- 

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--

-- Filename: fifo_32x512_dgen.vhd

--

-- Description:

--   Used for write interface stimulus generation

--

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-- Library Declarations

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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;

LIBRARY work;

USE work.fifo_32x512_pkg.ALL;

ENTITY fifo_32x512_dgen IS

  GENERIC (

            C_DIN_WIDTH   : INTEGER := 32;

            C_DOUT_WIDTH  : INTEGER := 32;

            C_CH_TYPE     : INTEGER := 0;

            TB_SEED       : INTEGER := 2

         );

  PORT (

        RESET     : IN STD_LOGIC;

        WR_CLK    : IN STD_LOGIC;

        PRC_WR_EN : IN STD_LOGIC;

        FULL      : IN STD_LOGIC;

        WR_EN     : OUT STD_LOGIC;

        WR_DATA   : OUT STD_LOGIC_VECTOR(C_DIN_WIDTH-1 DOWNTO 0)

       );

END ENTITY;

ARCHITECTURE fg_dg_arch OF fifo_32x512_dgen IS

  CONSTANT C_DATA_WIDTH : INTEGER := if_then_else(C_DIN_WIDTH > C_DOUT_WIDTH,C_DIN_WIDTH,C_DOUT_WIDTH);

  CONSTANT LOOP_COUNT   : INTEGER := divroundup(C_DATA_WIDTH,8);

  SIGNAL pr_w_en        : STD_LOGIC := '0';

  SIGNAL rand_num       : STD_LOGIC_VECTOR(8*LOOP_COUNT-1 DOWNTO 0);

  SIGNAL wr_data_i      : STD_LOGIC_VECTOR(C_DIN_WIDTH-1 DOWNTO 0);

 BEGIN

   WR_EN   <= PRC_WR_EN ;

   WR_DATA <= wr_data_i AFTER 100 ns;

  ----------------------------------------------

  -- Generation of DATA

  ----------------------------------------------

  gen_stim:FOR N IN LOOP_COUNT-1 DOWNTO 0 GENERATE

    rd_gen_inst1:fifo_32x512_rng

    GENERIC MAP(

               WIDTH => 8,

               SEED  => TB_SEED+N

               )

    PORT MAP(

              CLK        => WR_CLK,

              RESET      => RESET,

              RANDOM_NUM => rand_num(8*(N+1)-1 downto 8*N),

              ENABLE     => pr_w_en

            );

  END GENERATE;

     pr_w_en <= PRC_WR_EN AND NOT FULL;

     wr_data_i <= rand_num(C_DIN_WIDTH-1 DOWNTO 0);

END ARCHITECTURE;