data_gen.vhd

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--
-- BLK MEM GEN v7_3 Core - Data Generator
--
--------------------------------------------------------------------------------
--
-- (c) Copyright 2006_3010 Xilinx, Inc. All rights reserved.
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--
-- Filename: data_gen.vhd
--
-- Description:
--   Data Generator
--
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-- Author: IP Solutions Division
--
-- History: Sep 12, 2011 - First Release
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--
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-- Library Declarations
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LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;

LIBRARY work;
USE work.BMG_TB_PKG.ALL;

ENTITY DATA_GEN IS
  GENERIC ( DATA_GEN_WIDTH : INTEGER := 32;
            DOUT_WIDTH     : INTEGER := 32;
            DATA_PART_CNT  : INTEGER := 1;
            SEED           : INTEGER := 2
  );
        
  PORT (
        CLK      : IN STD_LOGIC;
        RST      : IN STD_LOGIC;
        EN       : IN STD_LOGIC; 
        DATA_OUT : OUT STD_LOGIC_VECTOR (DOUT_WIDTH-1 DOWNTO 0)   --OUTPUT VECTOR           
  );
END DATA_GEN;

ARCHITECTURE DATA_GEN_ARCH OF DATA_GEN IS
  CONSTANT LOOP_COUNT     : INTEGER   := DIVROUNDUP(DATA_GEN_WIDTH,8);
  SIGNAL   RAND_DATA      : STD_LOGIC_VECTOR(8*LOOP_COUNT-1 DOWNTO 0);
  SIGNAL   LOCAL_DATA_OUT : STD_LOGIC_VECTOR(DATA_GEN_WIDTH-1 DOWNTO 0);
  SIGNAL   LOCAL_CNT      : INTEGER   :=1;
  SIGNAL   DATA_GEN_I     : STD_LOGIC :='0';
BEGIN

  LOCAL_DATA_OUT <= RAND_DATA(DATA_GEN_WIDTH-1 DOWNTO 0);
  DATA_OUT       <= LOCAL_DATA_OUT(((DOUT_WIDTH*LOCAL_CNT)-1) DOWNTO ((DOUT_WIDTH*LOCAL_CNT)-DOUT_WIDTH));
  DATA_GEN_I     <= '0' WHEN (LOCAL_CNT < DATA_PART_CNT) ELSE EN;

  PROCESS(CLK)
  BEGIN
     IF(RISING_EDGE (CLK)) THEN
        IF(EN ='1' AND (DATA_PART_CNT =1)) THEN
           LOCAL_CNT <=1;
        ELSIF(EN='1' AND (DATA_PART_CNT>1)) THEN
           IF(LOCAL_CNT = 1) THEN
              LOCAL_CNT <= LOCAL_CNT+1;
           ELSIF(LOCAL_CNT < DATA_PART_CNT) THEN
              LOCAL_CNT <= LOCAL_CNT+1;
           ELSE
              LOCAL_CNT <= 1;
           END IF;
        ELSE
          LOCAL_CNT <= 1;
        END IF;
     END IF;
  END PROCESS;

  RAND_GEN:FOR N IN LOOP_COUNT-1 DOWNTO 0 GENERATE
    RAND_GEN_INST:ENTITY work.RANDOM
       GENERIC MAP(
           WIDTH  => 8,
           SEED  => (SEED+N) 
       )
       PORT MAP(
          CLK  => CLK,
          RST  => RST,
          EN   => DATA_GEN_I ,
          RANDOM_NUM  => RAND_DATA(8*(N+1)-1 DOWNTO 8*N)
       );
  END GENERATE RAND_GEN;

END ARCHITECTURE;