--------------------------------------------------------------------------------
--
-- FIFO Generator Core Demo Testbench 
--
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
--
-- Filename: DDR_output_dgen.vhd
--
-- Description:
--   Used for write interface stimulus generation
--
--------------------------------------------------------------------------------
-- 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;

LIBRARY work;
USE work.DDR_output_pkg.ALL;

ENTITY DDR_output_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 DDR_output_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:DDR_output_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;
