Subversion Repositories usb_fpga_2_13

library ieee;

use IEEE.std_logic_1164.all;

use IEEE.std_logic_arith.all;

use IEEE.std_logic_unsigned.all;

Library UNISIM;

use UNISIM.vcomponents.all;

entity memtest is

    port(

        FXCLK         : in std_logic;

        RESET_IN      : in std_logic;

        IFCLK         : in std_logic;

        PC0           : in std_logic;

        -- FX2 FIFO

        FD            : out std_logic_vector(15 downto 0);

        SLOE          : out std_logic;

        SLRD          : out std_logic;

        SLWR          : out std_logic;

        FIFOADR0      : out std_logic;

        FIFOADR1      : out std_logic;

        PKTEND        : out std_logic;

        FLAGB         : in std_logic;

        -- DDR-SDRAM

        mcb3_dram_dq     : inout std_logic_vector(15 downto 0);

        mcb3_rzq         : inout std_logic;

        mcb3_zio         : inout std_logic;

        mcb3_dram_udqs   : inout std_logic;

        mcb3_dram_udqs_n : inout std_logic;

        mcb3_dram_dqs    : inout std_logic;

        mcb3_dram_dqs_n  : inout std_logic;

        mcb3_dram_a      : out std_logic_vector(12 downto 0);

        mcb3_dram_ba     : out std_logic_vector(2 downto 0);

        mcb3_dram_cke    : out std_logic;

        mcb3_dram_ras_n  : out std_logic;

        mcb3_dram_cas_n  : out std_logic;

        mcb3_dram_we_n   : out std_logic;

--        mcb3_dram_odt    : out std_logic;

        mcb3_dram_dm     : out std_logic;

        mcb3_dram_udm    : out std_logic;

        mcb3_dram_ck     : out std_logic;

        mcb3_dram_ck_n   : out std_logic

    );

end memtest;

architecture RTL of memtest is

component mem0

    generic (

        C3_P0_MASK_SIZE       : integer := 4;

        C3_P0_DATA_PORT_SIZE  : integer := 32;

        C3_P1_MASK_SIZE       : integer := 4;

        C3_P1_DATA_PORT_SIZE  : integer := 32;

        C3_MEMCLK_PERIOD      : integer := 2500;

        C3_INPUT_CLK_TYPE     : string := "SINGLE_ENDED";

        C3_RST_ACT_LOW        : integer := 0;

        C3_CALIB_SOFT_IP      : string := "FALSE";

        C3_MEM_ADDR_ORDER     : string := "ROW_BANK_COLUMN";

        C3_NUM_DQ_PINS        : integer := 16;

        C3_MEM_ADDR_WIDTH     : integer := 13;

        C3_MEM_BANKADDR_WIDTH : integer := 3

    );

   port (

        mcb3_dram_dq         : inout std_logic_vector(C3_NUM_DQ_PINS-1 downto 0);

        mcb3_dram_a          : out std_logic_vector(C3_MEM_ADDR_WIDTH-1 downto 0);

        mcb3_dram_ba         : out std_logic_vector(C3_MEM_BANKADDR_WIDTH-1 downto 0);

        mcb3_dram_cke        : out std_logic;

        mcb3_dram_ras_n      : out std_logic;

        mcb3_dram_cas_n      : out std_logic;

        mcb3_dram_we_n       : out std_logic;

        mcb3_dram_dm         : out std_logic;

        mcb3_dram_udqs       : inout std_logic;

        mcb3_dram_udqs_n     : inout std_logic;

        mcb3_rzq             : inout std_logic;

        mcb3_zio             : inout std_logic;

        mcb3_dram_udm        : out std_logic;

        mcb3_dram_dqs        : inout std_logic;

        mcb3_dram_dqs_n      : inout std_logic;

        mcb3_dram_ck         : out std_logic;

        mcb3_dram_ck_n       : out std_logic;

--        mcb3_dram_odt        : out std_logic;

        c3_sys_clk           : in std_logic;

        c3_sys_rst_n         : in std_logic;

        c3_calib_done        : out std_logic;

        c3_clk0              : out std_logic;

        c3_rst0              : out std_logic;

        c3_p0_cmd_clk        : in std_logic;

        c3_p0_cmd_en         : in std_logic;

        c3_p0_cmd_instr      : in std_logic_vector(2 downto 0);

        c3_p0_cmd_bl         : in std_logic_vector(5 downto 0);

        c3_p0_cmd_byte_addr  : in std_logic_vector(29 downto 0);

        c3_p0_cmd_empty      : out std_logic;

        c3_p0_cmd_full       : out std_logic;

        c3_p0_wr_clk         : in std_logic;

        c3_p0_wr_en          : in std_logic;

        c3_p0_wr_mask        : in std_logic_vector(C3_P0_MASK_SIZE - 1 downto 0);

        c3_p0_wr_data        : in std_logic_vector(C3_P0_DATA_PORT_SIZE - 1 downto 0);

        c3_p0_wr_full        : out std_logic;

        c3_p0_wr_empty       : out std_logic;

        c3_p0_wr_count       : out std_logic_vector(6 downto 0);

        c3_p0_wr_underrun    : out std_logic;

        c3_p0_wr_error       : out std_logic;

        c3_p0_rd_clk         : in std_logic;

        c3_p0_rd_en          : in std_logic;

        c3_p0_rd_data        : out std_logic_vector(C3_P0_DATA_PORT_SIZE - 1 downto 0);

        c3_p0_rd_full        : out std_logic;

        c3_p0_rd_empty       : out std_logic;

        c3_p0_rd_count       : out std_logic_vector(6 downto 0);

        c3_p0_rd_overflow    : out std_logic;

        c3_p0_rd_error       : out std_logic;

        c3_p1_cmd_clk        : in std_logic;

        c3_p1_cmd_en         : in std_logic;

        c3_p1_cmd_instr      : in std_logic_vector(2 downto 0);

        c3_p1_cmd_bl         : in std_logic_vector(5 downto 0);

        c3_p1_cmd_byte_addr  : in std_logic_vector(29 downto 0);

        c3_p1_cmd_empty      : out std_logic;

        c3_p1_cmd_full       : out std_logic;

        c3_p1_wr_clk         : in std_logic;

        c3_p1_wr_en          : in std_logic;

        c3_p1_wr_mask        : in std_logic_vector(C3_P1_MASK_SIZE - 1 downto 0);

        c3_p1_wr_data        : in std_logic_vector(C3_P1_DATA_PORT_SIZE - 1 downto 0);

        c3_p1_wr_full        : out std_logic;

        c3_p1_wr_empty       : out std_logic;

        c3_p1_wr_count       : out std_logic_vector(6 downto 0);

        c3_p1_wr_underrun    : out std_logic;

        c3_p1_wr_error       : out std_logic;

        c3_p1_rd_clk         : in std_logic;

        c3_p1_rd_en          : in std_logic;

        c3_p1_rd_data        : out std_logic_vector(C3_P1_DATA_PORT_SIZE - 1 downto 0);

        c3_p1_rd_full        : out std_logic;

        c3_p1_rd_empty       : out std_logic;

        c3_p1_rd_count       : out std_logic_vector(6 downto 0);

        c3_p1_rd_overflow    : out std_logic;

        c3_p1_rd_error       : out std_logic;

        c3_p2_cmd_clk        : in std_logic;

        c3_p2_cmd_en         : in std_logic;

        c3_p2_cmd_instr      : in std_logic_vector(2 downto 0);

        c3_p2_cmd_bl         : in std_logic_vector(5 downto 0);

        c3_p2_cmd_byte_addr  : in std_logic_vector(29 downto 0);

        c3_p2_cmd_empty      : out std_logic;

        c3_p2_cmd_full       : out std_logic;

        c3_p2_wr_clk         : in std_logic;

        c3_p2_wr_en          : in std_logic;

        c3_p2_wr_mask        : in std_logic_vector(3 downto 0);

        c3_p2_wr_data        : in std_logic_vector(31 downto 0);

        c3_p2_wr_full        : out std_logic;

        c3_p2_wr_empty       : out std_logic;

        c3_p2_wr_count       : out std_logic_vector(6 downto 0);

        c3_p2_wr_underrun    : out std_logic;

        c3_p2_wr_error       : out std_logic;

        c3_p3_cmd_clk        : in std_logic;

        c3_p3_cmd_en         : in std_logic;

        c3_p3_cmd_instr      : in std_logic_vector(2 downto 0);

        c3_p3_cmd_bl         : in std_logic_vector(5 downto 0);

        c3_p3_cmd_byte_addr  : in std_logic_vector(29 downto 0);

        c3_p3_cmd_empty      : out std_logic;

        c3_p3_cmd_full       : out std_logic;

        c3_p3_rd_clk         : in std_logic;

        c3_p3_rd_en          : in std_logic;

        c3_p3_rd_data        : out std_logic_vector(31 downto 0);

        c3_p3_rd_full        : out std_logic;

        c3_p3_rd_empty       : out std_logic;

        c3_p3_rd_count       : out std_logic_vector(6 downto 0);

        c3_p3_rd_overflow    : out std_logic;

        c3_p3_rd_error       : out std_logic;

        c3_p4_cmd_clk        : in std_logic;

        c3_p4_cmd_en         : in std_logic;

        c3_p4_cmd_instr      : in std_logic_vector(2 downto 0);

        c3_p4_cmd_bl         : in std_logic_vector(5 downto 0);

        c3_p4_cmd_byte_addr  : in std_logic_vector(29 downto 0);

        c3_p4_cmd_empty      : out std_logic;

        c3_p4_cmd_full       : out std_logic;

        c3_p4_wr_clk         : in std_logic;

        c3_p4_wr_en          : in std_logic;

        c3_p4_wr_mask        : in std_logic_vector(3 downto 0);

        c3_p4_wr_data        : in std_logic_vector(31 downto 0);

        c3_p4_wr_full        : out std_logic;

        c3_p4_wr_empty       : out std_logic;

        c3_p4_wr_count       : out std_logic_vector(6 downto 0);

        c3_p4_wr_underrun    : out std_logic;

        c3_p4_wr_error       : out std_logic;

        c3_p5_cmd_clk        : in std_logic;

        c3_p5_cmd_en         : in std_logic;

        c3_p5_cmd_instr      : in std_logic_vector(2 downto 0);

        c3_p5_cmd_bl         : in std_logic_vector(5 downto 0);

        c3_p5_cmd_byte_addr  : in std_logic_vector(29 downto 0);

        c3_p5_cmd_empty      : out std_logic;

        c3_p5_cmd_full       : out std_logic;

        c3_p5_rd_clk         : in std_logic;

        c3_p5_rd_en          : in std_logic;

        c3_p5_rd_data        : out std_logic_vector(31 downto 0);

        c3_p5_rd_full        : out std_logic;

        c3_p5_rd_empty       : out std_logic;

        c3_p5_rd_count       : out std_logic_vector(6 downto 0);

        c3_p5_rd_overflow    : out std_logic;

        c3_p5_rd_error       : out std_logic

);

end component;

--attribute optimize : string;

--attribute optimize of counters:entity is "off";

signal fxclk_buf : std_logic;

signal CLK : std_logic;

signal RESET0 : std_logic;      -- released after dcm0 is ready

signal RESET : std_logic;       -- released after MCB is ready

signal DCM0_LOCKED : std_logic;

--signal DCM0_CLK_VALID : std_logic;

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

-- test pattern generator --

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

signal GEN_CNT : std_logic_vector(29 downto 0);

signal GEN_PATTERN : std_logic_vector(29 downto 0);

signal FIFO_WORD : std_logic;

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

-- memory controller --

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

signal MEM_CLK : std_logic;

signal C3_CALIB_DONE : std_logic;

signal C3_RST0 : std_logic;

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

-- DRAM FIFO --

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

signal WR_CLK       : std_logic;

signal WR_CMD_EN    : std_logic_vector(2 downto 0);

type WR_CMD_ADDR_ARRAY is array(2 downto 0) of std_logic_vector(29 downto 0);

signal WR_CMD_ADDR  : WR_CMD_ADDR_ARRAY;

signal WR_ADDR      : std_logic_vector(18 downto 0);   -- in 256 bytes burst blocks

signal WR_EN        : std_logic_vector(2 downto 0);

signal WR_EN_TMP    : std_logic_vector(2 downto 0);

signal WR_DATA      : std_logic_vector(31 downto 0);

signal WR_EMPTY     : std_logic_vector(2 downto 0);

signal WR_UNDERRUN  : std_logic_vector(2 downto 0);

signal WR_ERROR     : std_logic_vector(2 downto 0);

type WR_COUNT_ARRAY is array(2 downto 0) of std_logic_vector(6 downto 0);

signal WR_COUNT     : WR_COUNT_ARRAY;

signal WR_PORT      : std_logic_vector(1 downto 0);

signal RD_CLK       : std_logic;

signal RD_CMD_EN    : std_logic_vector(2 downto 0);

type RD_CMD_ADDR_ARRAY is array(2 downto 0) of std_logic_vector(29 downto 0);

signal RD_CMD_ADDR  : WR_CMD_ADDR_ARRAY;

signal RD_ADDR      : std_logic_vector(18 downto 0); -- in 256 bytes burst blocks

signal RD_EN        : std_logic_vector(2 downto 0);

type RD_DATA_ARRAY is array(2 downto 0) of std_logic_vector(31 downto 0);

signal RD_DATA      : RD_DATA_ARRAY;

signal RD_EMPTY     : std_logic_vector(2 downto 0);

signal RD_OVERFLOW  : std_logic_vector(2 downto 0);

signal RD_ERROR     : std_logic_vector(2 downto 0);

signal RD_PORT      : std_logic_vector(1 downto 0);

type RD_COUNT_ARRAY is array(2 downto 0) of std_logic_vector(6 downto 0);

signal RD_COUNT     : RD_COUNT_ARRAY;

signal FD_TMP        : std_logic_vector(15 downto 0);

signal RD_ADDR2      : std_logic_vector(18 downto 0);   -- 256 bytes burst block currently beeing read

signal RD_ADDR2_BAK1 : std_logic_vector(18 downto 0);   -- backup for synchronization

signal RD_ADDR2_BAK2 : std_logic_vector(18 downto 0);   -- backup for synchronization

signal WR_ADDR2      : std_logic_vector(18 downto 0);   -- 256 bytes burst block currently beeing written

signal WR_ADDR2_BAK1 : std_logic_vector(18 downto 0);   -- backup for synchronization

signal WR_ADDR2_BAK2 : std_logic_vector(18 downto 0);   -- backup for synchronization

signal RD_STOP       : std_logic;

begin

    clkin_buf : IBUFG

    port map (

        O => FXCLK_BUF,

        I => FXCLK

     );

    dcm0 : DCM_CLKGEN

    generic map (

        CLKFX_DIVIDE    => 3,

--        CLKFX_MULTIPLY  => 33,

        CLKFX_MULTIPLY  => 25,

        CLKFXDV_DIVIDE  => 8,

        SPREAD_SPECTRUM => "NONE",

        STARTUP_WAIT    => FALSE,

        CLKIN_PERIOD    => 20.83333,

        CLKFX_MD_MAX    => 0.000

     )

     port map (

        CLKIN     => FXCLK_BUF,

        CLKFX     => MEM_CLK,

        CLKFX180  => open,

        CLKFXDV   => CLK,

        LOCKED    => DCM0_LOCKED,

        PROGDONE  => open,

        STATUS    => open,

        FREEZEDCM => '0',

        PROGCLK   => '0',

        PROGDATA  => '0',

        PROGEN    => '0',

        RST       => '0'

     );

    inst_mem0 : mem0 port map (

        mcb3_dram_dq    =>  mcb3_dram_dq,

        mcb3_dram_a     =>  mcb3_dram_a,

        mcb3_dram_ba    =>  mcb3_dram_ba,

        mcb3_dram_ras_n =>  mcb3_dram_ras_n,

        mcb3_dram_cas_n =>  mcb3_dram_cas_n,

        mcb3_dram_we_n  =>  mcb3_dram_we_n,

--        mcb3_dram_odt   =>  mcb3_dram_odt,                          

        mcb3_dram_cke   =>  mcb3_dram_cke,

        mcb3_dram_ck    =>  mcb3_dram_ck,

        mcb3_dram_ck_n  =>  mcb3_dram_ck_n,

        mcb3_dram_dqs   =>  mcb3_dram_dqs,

        mcb3_dram_dqs_n =>  mcb3_dram_dqs_n,

        mcb3_dram_udqs  =>  mcb3_dram_udqs,    -- for X16 parts           

        mcb3_dram_udqs_n=>  mcb3_dram_udqs_n,  -- for X16 parts           

        mcb3_dram_udm   =>  mcb3_dram_udm,     -- for X16 parts

        mcb3_dram_dm    =>  mcb3_dram_dm,

        mcb3_rzq        =>  mcb3_rzq,

        mcb3_zio        =>  mcb3_zio,

        c3_sys_clk      =>  MEM_CLK,

        c3_sys_rst_n    =>  RESET0,

        c3_clk0         =>  open,

        c3_rst0         =>  C3_RST0,

        c3_calib_done   =>  C3_CALIB_DONE,

        c3_p0_cmd_clk        =>  WR_CLK,

        c3_p0_cmd_en         =>  WR_CMD_EN(0),

        c3_p0_cmd_instr      =>  "000",

        c3_p0_cmd_bl         =>  ( others => '1' ),

        c3_p0_cmd_byte_addr  =>  WR_CMD_ADDR(0),

        c3_p0_cmd_empty      =>  open,

        c3_p0_cmd_full       =>  open,

        c3_p0_wr_clk         =>  WR_CLK,

        c3_p0_wr_en          =>  WR_EN(0),

        c3_p0_wr_mask        =>  ( others => '0' ),

        c3_p0_wr_data        =>  WR_DATA,

        c3_p0_wr_full        =>  open,

        c3_p0_wr_empty       =>  WR_EMPTY(0),

        c3_p0_wr_count       =>  open,

        c3_p0_wr_underrun    =>  WR_UNDERRUN(0),

        c3_p0_wr_error       =>  WR_ERROR(0),

        c3_p0_rd_clk         =>  WR_CLK,

        c3_p0_rd_en          =>  '0',

        c3_p0_rd_data        =>  open,

        c3_p0_rd_full        =>  open,

        c3_p0_rd_empty       =>  open,

        c3_p0_rd_count       =>  open,

        c3_p0_rd_overflow    =>  open,

        c3_p0_rd_error       =>  open,

        c3_p2_cmd_clk        =>  WR_CLK,

        c3_p2_cmd_en         =>  WR_CMD_EN(1),

        c3_p2_cmd_instr      =>  "000",

        c3_p2_cmd_bl         =>  ( others => '1' ),

        c3_p2_cmd_byte_addr  =>  WR_CMD_ADDR(1),

        c3_p2_cmd_empty      =>  open,

        c3_p2_cmd_full       =>  open,

        c3_p2_wr_clk         =>  WR_CLK,

        c3_p2_wr_en          =>  WR_EN(1),

        c3_p2_wr_mask        =>  ( others => '0' ),

        c3_p2_wr_data        =>  WR_DATA,

        c3_p2_wr_full        =>  open,

        c3_p2_wr_empty       =>  WR_EMPTY(1),

        c3_p2_wr_count       =>  open,

        c3_p2_wr_underrun    =>  WR_UNDERRUN(1),

        c3_p2_wr_error       =>  WR_ERROR(1),

        c3_p4_cmd_clk        =>  WR_CLK,

        c3_p4_cmd_en         =>  WR_CMD_EN(2),

        c3_p4_cmd_instr      =>  "000",

        c3_p4_cmd_bl         =>  ( others => '1' ),

        c3_p4_cmd_byte_addr  =>  WR_CMD_ADDR(2),

        c3_p4_cmd_empty      =>  open,

        c3_p4_cmd_full       =>  open,

        c3_p4_wr_clk         =>  WR_CLK,

        c3_p4_wr_en          =>  WR_EN(2),

        c3_p4_wr_mask        =>  ( others => '0' ),

        c3_p4_wr_data        =>  WR_DATA,

        c3_p4_wr_full        =>  open,

        c3_p4_wr_empty       =>  WR_EMPTY(2),

        c3_p4_wr_count       =>  open,

        c3_p4_wr_underrun    =>  WR_UNDERRUN(2),

        c3_p4_wr_error       =>  WR_ERROR(2),

        c3_p1_cmd_clk        =>  RD_CLK,

        c3_p1_cmd_en         =>  RD_CMD_EN(0),

        c3_p1_cmd_instr      =>  "001",

        c3_p1_cmd_bl         =>  ( others => '1' ),

        c3_p1_cmd_byte_addr  =>  RD_CMD_ADDR(0),

        c3_p1_cmd_empty      =>  open,

        c3_p1_cmd_full       =>  open,

        c3_p1_wr_clk         =>  RD_CLK,

        c3_p1_wr_en          =>  '0',

        c3_p1_wr_mask        =>  ( others => '0' ),

        c3_p1_wr_data        =>  ( others => '0' ),

        c3_p1_wr_full        =>  open,

        c3_p1_wr_empty       =>  open,

        c3_p1_wr_count       =>  open,

        c3_p1_wr_underrun    =>  open,

        c3_p1_wr_error       =>  open,

        c3_p1_rd_clk         =>  RD_CLK,

        c3_p1_rd_en          =>  RD_EN(0),

        c3_p1_rd_data        =>  RD_DATA(0),

        c3_p1_rd_full        =>  open,

        c3_p1_rd_empty       =>  RD_EMPTY(0),

        c3_p1_rd_count       =>  open,

        c3_p1_rd_overflow    =>  RD_OVERFLOW(0),

        c3_p1_rd_error       =>  RD_ERROR(0),

        c3_p3_cmd_clk        =>  RD_CLK,

        c3_p3_cmd_en         =>  RD_CMD_EN(1),

        c3_p3_cmd_instr      =>  "001",

        c3_p3_cmd_bl         =>  ( others => '1' ),

        c3_p3_cmd_byte_addr  =>  RD_CMD_ADDR(1),

        c3_p3_cmd_empty      =>  open,

        c3_p3_cmd_full       =>  open,

        c3_p3_rd_clk         =>  RD_CLK,

        c3_p3_rd_en          =>  RD_EN(1),

        c3_p3_rd_data        =>  RD_DATA(1),

        c3_p3_rd_full        =>  open,

        c3_p3_rd_empty       =>  RD_EMPTY(1),

        c3_p3_rd_count       =>  open,

        c3_p3_rd_overflow    =>  RD_OVERFLOW(1),

        c3_p3_rd_error       =>  RD_ERROR(1),

        c3_p5_cmd_clk        =>  RD_CLK,

        c3_p5_cmd_en         =>  RD_CMD_EN(2),

        c3_p5_cmd_instr      =>  "001",

        c3_p5_cmd_bl         =>  ( others => '1' ),

        c3_p5_cmd_byte_addr  =>  RD_CMD_ADDR(2),

        c3_p5_cmd_empty      =>  open,

        c3_p5_cmd_full       =>  open,

        c3_p5_rd_clk         =>  RD_CLK,

        c3_p5_rd_en          =>  RD_EN(2),

        c3_p5_rd_data        =>  RD_DATA(2),

        c3_p5_rd_full        =>  open,

        c3_p5_rd_empty       =>  RD_EMPTY(2),

        c3_p5_rd_count       =>  open,

        c3_p5_rd_overflow    =>  RD_OVERFLOW(2),

        c3_p5_rd_error       =>  RD_ERROR(2)

);

    SLOE <= '1';

    SLRD <= '1';

    FIFOADR0 <= '0';

    FIFOADR1 <= '0';

    PKTEND <= '1';

    WR_CLK <= CLK;

    RD_CLK <= IFCLK;

--    DCM0_CLK_VALID <= ( DCM0_LOCKED and ( not status_internal(2) ) );

--    RESET0 <= RESET_IN or (not DCM0_LOCKED) or (not DCM0_CLK_VALID);

    RESET0 <= RESET_IN or (not DCM0_LOCKED);

    RESET <= RESET0 or (not C3_CALIB_DONE) or C3_RST0;

    dpCLK: process (CLK, RESET)

    begin

-- reset

        if RESET = '1'

        then

            GEN_CNT <= ( others => '0' );

            GEN_PATTERN <= "100101010101010101010101010101";

            WR_CMD_EN      <= ( others => '0' );

            WR_CMD_ADDR(0) <= ( others => '0' );

            WR_CMD_ADDR(1) <= ( others => '0' );

            WR_CMD_ADDR(2) <= ( others => '0' );

            WR_ADDR        <= conv_std_logic_vector(3,19);

            WR_EN          <= ( others => '0' );

            WR_COUNT(0)    <= ( others => '0' );

            WR_COUNT(1)    <= ( others => '0' );

            WR_COUNT(2)    <= ( others => '0' );

            WR_PORT        <= ( others => '0' );

            WR_ADDR2       <= ( others => '0' );

            RD_ADDR2_BAK1  <= ( others => '0' );

            RD_ADDR2_BAK2  <= ( others => '0' );

-- CLK

        elsif CLK'event and CLK = '1'

        then

            WR_CMD_EN <= ( others => '0' );

            WR_EN <= ( others => '0' );

            WR_CMD_ADDR(conv_integer(WR_PORT))(26 downto 8) <= WR_ADDR;

            if ( WR_COUNT(conv_integer(WR_PORT)) = conv_std_logic_vector(64,7) )

                then

                -- FF flag = 1

                if ( RD_ADDR2_BAK1 = RD_ADDR2_BAK2 ) and ( RD_ADDR2_BAK2 /= WR_ADDR )

                then

                    WR_CMD_EN(conv_integer(WR_PORT)) <= '1';

                    WR_COUNT(conv_integer(WR_PORT)) <= ( others => '0' );

                    if WR_PORT = "10"

                    then

                        WR_PORT <= "00";

                    else

                        WR_PORT <= WR_PORT + 1;

                    end if;

                    WR_ADDR <= WR_ADDR + 1;

                    WR_ADDR2 <= WR_ADDR2 + 1;

                end if;

            elsif ( WR_COUNT(conv_integer(WR_PORT)) = conv_std_logic_vector(0,7)) and (WR_EMPTY(conv_integer(WR_PORT)) = '0' )  -- write port fifo not empty 

            then

                -- FF flag = 1 

            else

                WR_EN(conv_integer(WR_PORT)) <= '1';

                WR_DATA(31) <= '1';

                WR_DATA(15) <= '0';

                if PC0 = '1'

                then

                    WR_DATA(30 downto 16) <= GEN_PATTERN(29 downto 15);

                    WR_DATA(14 downto 0) <= GEN_PATTERN(14 downto 0);

                else

                    WR_DATA(30 downto 16) <= GEN_CNT(29 downto 15);

                    WR_DATA(14 downto 0) <= GEN_CNT(14 downto 0);

                end if;

                GEN_CNT <= GEN_CNT + 1;

                GEN_PATTERN(29) <= GEN_PATTERN(0);

                GEN_PATTERN(28 downto 0) <= GEN_PATTERN(29 downto 1);

--              if ( WR_COUNT(conv_integer(WR_PORT)) = conv_std_logic_vector(63,7) ) and ( RD_ADDR2_BAK1 = RD_ADDR2_BAK2 ) and ( RD_ADDR2_BAK2 /= WR_ADDR )

--                Add code from above here. This saves one clock cylcle and is required for uninterrupred input.

--              then

--              else

                    WR_COUNT(conv_integer(WR_PORT)) <= WR_COUNT(conv_integer(WR_PORT)) + 1;

--              end if;

            end if;

            RD_ADDR2_BAK1 <= RD_ADDR2;

            RD_ADDR2_BAK2 <= RD_ADDR2_BAK1;

        end if;

    end process dpCLK;

    dpIFCLK: process (IFCLK, RESET)

    begin

-- reset

        if RESET = '1'

        then

            FIFO_WORD <= '0';

            SLWR <= '1';

            RD_CMD_EN      <= ( others => '0' );

            RD_CMD_ADDR(0) <= ( others => '0' );

            RD_CMD_ADDR(1) <= ( others => '0' );

            RD_CMD_ADDR(2) <= ( others => '0' );

            RD_ADDR        <= conv_std_logic_vector(3,19);

            RD_EN          <= ( others => '0' );

            RD_COUNT(0)    <= conv_std_logic_vector(64,7);

            RD_COUNT(1)    <= conv_std_logic_vector(64,7);

            RD_COUNT(2)    <= conv_std_logic_vector(64,7);

            RD_PORT        <= ( others => '0' );

            RD_ADDR2       <= ( others => '0' );

            WR_ADDR2_BAK1  <= ( others => '0' );

            WR_ADDR2_BAK2  <= ( others => '0' );

            RD_STOP        <= '1';

-- IFCLK

        elsif IFCLK'event and IFCLK = '1'

        then

            RD_CMD_EN <= ( others => '0' );

            RD_CMD_ADDR(conv_integer(RD_PORT))(26 downto 8) <= RD_ADDR;

            RD_EN(conv_integer(RD_PORT)) <= '0';

            if FLAGB = '1'

            then

                if ( RD_EMPTY(conv_integer(RD_PORT)) = '1' ) or ( RD_COUNT(conv_integer(RD_PORT)) = conv_std_logic_vector(64,7) )

                then

                    SLWR <= '1';

                    if ( RD_COUNT(conv_integer(RD_PORT)) = conv_std_logic_vector(64,7) ) and ( RD_EMPTY(conv_integer(RD_PORT)) = '1' ) and ( WR_ADDR2_BAK2 = WR_ADDR2_BAK1 ) and ( WR_ADDR2_BAK2 /= RD_ADDR ) and ( RD_STOP = '0' )

                    then

                        RD_CMD_EN(conv_integer(RD_PORT)) <= '1';