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[/] [usb11_sim_model/] [trunk/] [USB_Stimuli.vhd] - Diff between revs 2 and 6

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--==========================================================================================================--
--==========================================================================--
--                                                                                                          --
--                                                                                                          --
--  Copyright (C) 2011  by  Martin Neumann martin@neumanns-mail.de                                          --
--  Copyright (C) 2011  by  Martin Neumann martin@neumanns-mail.de                                          --
--                                                                                                          --
--                                                                                                          --
--  This source file may be used and distributed without restriction provided that this copyright statement --
--  File name   : usb_tc03.vhd                                              --
--  is not removed from the file and that any derivative work contains the original copyright notice and    --
 
--  the associated disclaimer.                                                                              --
 
--                                                                                                          --
 
--  This software is provided ''as is'' and without any express or implied warranties, including, but not   --
 
--  limited to, the implied warranties of merchantability and fitness for a particular purpose. in no event --
 
--  shall the author or contributors be liable for any direct, indirect, incidental, special, exemplary, or --
 
--  consequential damages (including, but not limited to, procurement of substitute goods or services; loss --
 
--  of use, data, or profits; or business interruption) however caused and on any theory of liability,      --
 
--  whether in  contract, strict liability, or tort (including negligence or otherwise) arising in any way  --
 
--  out of the use of this software, even if advised of the possibility of such damage.                     --
 
--                                                                                                          --
 
--==========================================================================================================--
 
--                                                                                                          --
 
--  File name   : USB_tc_02.vhd                                                                             --
 
--  Author      : Martin Neumann  martin@neumanns-mail.de                                                   --
--  Author      : Martin Neumann  martin@neumanns-mail.de                                                   --
--  Description : Copy and rename this file to usb_stimuli.vhd before running a new simulation!             --
--  Description : Copy and rename this file to usb_stimuli.vhd              --
 
--                before running a new simulation!                          --
--                                                                                                          --
--                                                                                                          --
--==========================================================================================================--
--==========================================================================--
--                                                                                                          --
--                                                                                                          --
-- Change history                                                                                           --
-- Change history                                                                                           --
--                                                                                                          --
--                                                                                                          --
-- Version / date        Description                                                                        --
-- Version / date        Description                                                                        --
--                                                                                                          --
--                                                                                                          --
-- 01  05 Mar 2011 MN    Initial version                                                                    --
-- 01  15 Mar 2013 MN    Initial version                                    --
--                                                                                                          --
--                                                                                                          --
-- End change history                                                                                       --
-- End change history                                                                                       --
--==========================================================================================================--
--==========================================================================--
 
 
LIBRARY work, IEEE;
LIBRARY work, IEEE;
  USE IEEE.std_logic_1164.ALL;
  USE IEEE.std_logic_1164.ALL;
  USE IEEE.std_logic_arith.ALL;
  USE IEEE.std_logic_arith.ALL;
  USE work.usb_commands.ALL;
  USE work.usb_commands.ALL;
 
 
ENTITY USB_Stimuli IS PORT(
ENTITY USB_Stimuli IS PORT(
  -- Test Control Interface --
  -- Test Control Interface --
  USB             : OUT usb_action;
  USB             : OUT usb_action;
  t_no            : OUT NATURAL;
 
  -- Application Interface
 
  clk             : IN  STD_LOGIC;
 
  rst_neg_ext     : OUT STD_LOGIC;
  rst_neg_ext     : OUT STD_LOGIC;
  RXval           : IN  STD_LOGIC;                    -- RX bytes available
  t_no            : OUT NATURAL
  RXdat           : IN  STD_LOGIC_VECTOR(7 DOWNTO 0); -- Received data bytes
);
  RXrdy           : OUT STD_LOGIC := '0';             -- Application ready for data
 
  RXlen           : IN  STD_LOGIC_VECTOR(7 DOWNTO 0); -- Number of bytes available
 
  TXval           : OUT STD_LOGIC := '0';             -- Application has valid data
 
  TXdat           : OUT STD_LOGIC_VECTOR(7 DOWNTO 0); -- Data byte to send
 
  TXrdy           : IN  STD_LOGIC;                    -- Entity is ready for data
 
  TXroom          : IN  STD_LOGIC_VECTOR(7 DOWNTO 0); -- No of free bytes in TX
 
  TXcork          : OUT STD_LOGIC := '1');            -- Hold TX transmission
 
END USB_Stimuli;
END USB_Stimuli;
 
 
ARCHITECTURE sim OF usb_stimuli IS
ARCHITECTURE sim OF usb_stimuli IS
 
 
  SIGNAL   rd_data : byte_array(0 TO 7);
 
  SIGNAL   TX_load : STD_LOGIC := '0';
 
 
 
BEGIN
BEGIN
 
--==========================================================================--
 
-- All outcommented procedure calls reflect the expected USB Slave response --
 
--==========================================================================--
  p_stimuli_data : PROCESS
  p_stimuli_data : PROCESS
 
  variable top : NATURAL;
  BEGIN
  BEGIN
    list("*****************************");
    list("**********************************");
    list("*   Results of tc_02.vhd    *");
    list("*                                *");
    list("*****************************");
    list("*       Test USB FS SLAVE        *");
    list(" ");
    list("* Init according to Win 7 driver *");
    list(T_No, 10);
    list("*                                *");
 
    list("**********************************");
    rst_neg_ext <= '0';
    rst_neg_ext <= '0';
    WAIT FOR 301 ns;
    WAIT FOR 301 ns;
    rst_neg_ext <= '1';
    rst_neg_ext <= '1';
    WAIT FOR 40 ns;
    WAIT FOR 400 ns;
    list("Reset completed, initializing");
    --***************************************--
    TX_load <= '1';
    list(T_No, 01);
    list(T_No, 20);
    send_res(usb);
    setup(usb, X"00", X"0");                                          --Send Setup to addr 0, endp 0 ..
    sof_token(usb, X"55D");
    send_D0(usb,(X"80",X"06",X"00",X"01",X"00",X"00",X"40",X"00"));  -- .. 'Get Device descriptor'
    sof_token(usb, X"55E");
    wait_slv(usb);                                                   --Recv ACK
    sof_token(usb, X"55F");
    in_token(usb, X"00", X"0");                                      --Send IN-Token
    setup(usb, X"00",X"0"); -- GET_DESCRIPTOR
    wait_slv(usb);                                                   --Recv Data1 Device Discriptor
    send_D0   (usb, (X"80",X"06",X"00",X"01",X"00",X"00",X"40",X"00"));
    send_ack(usb);                                                   --Send ACK
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"00",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb, (X"12",X"01",X"10",X"01",X"02",X"00",X"00",X"40",
 
--                   X"9A",X"FB",X"9A",X"FB",X"20",X"00",X"00",X"00",
 
--                   X"00",X"01"));
 
    send_ACK  (usb);
    out_token(usb, X"00", X"0");
    out_token(usb, X"00", X"0");
    send_D0(usb);                                                    --Send Zero Data
    send_D1   (usb);
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    send_res(usb);
 
    list(T_No, 02);
 
    --***************************************--
 
    setup(usb, X"00",X"0"); -- SET_ADDRESS
 
    send_D0   (usb, (X"00",X"05",X"02",X"00",X"00",X"00",X"00",X"00"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"00",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb);
 
    send_ACK  (usb);
 
    list(T_No, 03);
 
    --***************************************--
 
    setup(usb, X"02",X"0"); -- GET_DESCRIPTOR 1
 
    send_D0   (usb, (X"80",X"06",X"00",X"01",X"00",X"00",X"12",X"00"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb, (X"12",X"01",X"10",X"01",X"02",X"00",X"00",X"40",
 
--                   X"9A",X"FB",X"9A",X"FB",X"20",X"00",X"00",X"00",
 
--                   X"00",X"01"));
 
    send_ACK  (usb);
 
    out_token(usb, X"02",X"0");
 
    send_D1   (usb);
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    list(T_No, 04);
 
    --***************************************--
 
    setup(usb, X"02",X"0"); -- GET_DESCRIPTOR 2
 
    send_D0   (usb, (X"80",X"06",X"00",X"02",X"00",X"00",X"FF",X"00"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb, (X"09",X"02",X"43",X"00",X"02",X"01",X"00",X"80",
 
--                   X"FA",X"09",X"04",X"00",X"00",X"01",X"02",X"02",
 
--                   X"01",X"00",X"05",X"24",X"00",X"10",X"01",X"04",
 
--                   X"24",X"02",X"00",X"05",X"24",X"06",X"00",X"01",
 
--                   X"05",X"24",X"01",X"00",X"01",X"07",X"05",X"82",
 
--                   X"03",X"08",X"00",X"FF",X"09",X"04",X"01",X"00",
 
--                   X"02",X"0A",X"00",X"00",X"00",X"07",X"05",X"81",
 
--                   X"02",X"40",X"00",X"00",X"07",X"05",X"01",X"02"));
 
    send_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D0   (usb, (X"40",X"00",X"00"));
 
    send_ACK  (usb);
 
    out_token(usb, X"02",X"0");
 
    send_D1   (usb);
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    list(T_No, 05);
 
    --***************************************--
 
    setup(usb, X"02",X"0"); -- GET_DESCRIPTOR 1
 
    send_D0   (usb, (X"80",X"06",X"00",X"01",X"00",X"00",X"12",X"00"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb, (X"12",X"01",X"10",X"01",X"02",X"00",X"00",X"40",
 
--                   X"9A",X"FB",X"9A",X"FB",X"20",X"00",X"00",X"00",
 
--                   X"00",X"01"));
 
    send_ACK  (usb);
 
    out_token(usb, X"02",X"0");
 
    send_D1   (usb);
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    list(T_No, 06);
 
    --***************************************--
 
    setup(usb, X"02",X"0"); -- GET_DESCRIPTOR 2
 
    send_D0   (usb, (X"80",X"06",X"00",X"02",X"00",X"00",X"09",X"01"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb, (X"09",X"02",X"43",X"00",X"02",X"01",X"00",X"80",
 
--                   X"FA",X"09",X"04",X"00",X"00",X"01",X"02",X"02",
 
--                   X"01",X"00",X"05",X"24",X"00",X"10",X"01",X"04",
 
--                   X"24",X"02",X"00",X"05",X"24",X"06",X"00",X"01",
 
--                   X"05",X"24",X"01",X"00",X"01",X"07",X"05",X"82",
 
--                   X"03",X"08",X"00",X"FF",X"09",X"04",X"01",X"00",
 
--                   X"02",X"0A",X"00",X"00",X"00",X"07",X"05",X"81",
 
--                   X"02",X"40",X"00",X"00",X"07",X"05",X"01",X"02"));
 
    send_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D0   (usb, (X"40",X"00",X"00"));
 
    send_ACK  (usb);
 
    out_token(usb, X"02",X"0");
 
    send_D1   (usb);
    wait_slv(usb);
    wait_slv(usb);
 
--  recv_ACK  (usb);
 
    list(T_No, 07);
 
    --***************************************--
 
    setup(usb, X"02",X"0"); -- SET_CONFIGURATION
 
    send_D0   (usb, (X"00",X"09",X"01",X"00",X"00",X"00",X"00",X"00"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb);
 
    send_ACK  (usb);
 
    list(T_No, 08);
 
    --***************************************--
 
    setup(usb, X"02",X"0");
 
    send_D0   (usb, (X"A1",X"21",X"00",X"00",X"00",X"00",X"07",X"00"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb);
 
    send_ACK  (usb);
 
    out_token(usb, X"02",X"0");
 
    send_D1   (usb);
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    list(T_No, 09);
 
    --***************************************--
 
    setup(usb, X"02",X"0");
 
    send_D0   (usb, (X"21",X"22",X"00",X"00",X"00",X"00",X"00",X"00"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    in_token(usb, X"02",X"0");
 
    wait_slv  (usb);
 
--  recv_D1   (usb);
 
    send_ACK  (usb);
 
    list("write and read 3x 64 bytes to - from engine 1");
 
--==========================================================================--
 
--  Win 7 configuration sequence has been completed - applicatioon starting --
 
--  First engine 1 transfer after setup -> data toggle bit starts with 0 !! --
 
--==========================================================================--
 
    list(T_No, 10);
 
    out_token(usb, X"02",X"1");
 
    send_D0   (usb, (X"00",X"01",X"02",X"03",X"04",X"05",X"06",X"07",
 
                     X"08",X"09",X"0A",X"0B",X"0C",X"0D",X"0E",X"0F",
 
                     X"10",X"11",X"12",X"13",X"14",X"15",X"16",X"17",
 
                     X"18",X"19",X"1A",X"1B",X"1C",X"1D",X"1E",X"1F",
 
                     X"20",X"21",X"22",X"23",X"24",X"25",X"26",X"27",
 
                     X"28",X"29",X"2A",X"2B",X"2C",X"2D",X"2E",X"2F",
 
                     X"30",X"31",X"32",X"33",X"34",X"35",X"36",X"37",
 
                     X"38",X"39",X"3A",X"3B",X"3C",X"3D",X"3E",X"3F"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    out_token(usb, X"02",X"1");
 
    send_D1   (usb, (X"40",X"41",X"42",X"43",X"44",X"45",X"46",X"47",
 
                     X"48",X"49",X"4A",X"4B",X"4C",X"4D",X"4E",X"4F",
 
                     X"50",X"51",X"52",X"53",X"54",X"55",X"56",X"57",
 
                     X"58",X"59",X"5A",X"5B",X"5C",X"5D",X"5E",X"5F",
 
                     X"60",X"61",X"62",X"63",X"64",X"65",X"66",X"67",
 
                     X"68",X"69",X"6A",X"6B",X"6C",X"6D",X"6E",X"6F",
 
                     X"70",X"71",X"72",X"73",X"74",X"75",X"76",X"77",
 
                     X"78",X"79",X"7A",X"7B",X"7C",X"7D",X"7E",X"7F"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    out_token(usb, X"02",X"1");
 
    send_D0   (usb, (X"80",X"81",X"82",X"83",X"84",X"85",X"86",X"87",
 
                     X"88",X"89",X"8A",X"8B",X"8C",X"8D",X"8E",X"8F",
 
                     X"90",X"91",X"92",X"93",X"94",X"95",X"96",X"97",
 
                     X"98",X"99",X"9A",X"9B",X"9C",X"9D",X"9E",X"9F",
 
                     X"A0",X"A1",X"A2",X"A3",X"A4",X"A5",X"A6",X"A7",
 
                     X"A8",X"A9",X"AA",X"AB",X"AC",X"AD",X"AE",X"AF",
 
                     X"B0",X"B1",X"B2",X"B3",X"B4",X"B5",X"B6",X"B7",
 
                     X"B8",X"B9",X"BA",X"BB",X"BC",X"BD",X"BE",X"BF"));
 
    wait_slv  (usb);
 
--  recv_ACK  (usb);
 
    list(T_No, 11);
 
    list("read 1st 64 bytes");
 
    in_token(usb, X"02",X"1");
 
    wait_slv  (usb);
 
 -- recv_D0   (usb, (X"00",X"10",X"20",X"30",X"40",X"50",X"60",X"70",
 
 --                  X"80",X"90",X"A0",X"B0",X"C0",X"D0",X"E0",X"F0",
 
 --                  X"01",X"11",X"21",X"31",X"41",X"51",X"61",X"71",
 
 --                  X"81",X"91",X"A1",X"B1",X"C1",X"D1",X"E1",X"F1",
 
 --                  X"02",X"12",X"22",X"32",X"42",X"52",X"62",X"72",
 
 --                  X"82",X"92",X"A2",X"B2",X"C2",X"D2",X"E2",X"F2",
 
 --                  X"03",X"13",X"23",X"33",X"43",X"53",X"63",X"73",
 
 --                  X"83",X"93",X"A3",X"B3",X"C3",X"D3",X"E3",X"F3"));
 
    send_ACK  (usb);
 
    list("read 2nd 64 bytes");
 
    in_token(usb, X"02",X"1");
 
    wait_slv  (usb);
 
 -- recv_D1   (usb, (X"04",X"14",X"24",X"34",X"44",X"54",X"64",X"74",
 
 --                  X"84",X"94",X"A4",X"B4",X"C4",X"D4",X"E4",X"F4",
 
 --                  X"05",X"15",X"25",X"35",X"45",X"55",X"65",X"75",
 
 --                  X"85",X"95",X"A5",X"B5",X"C5",X"D5",X"E5",X"F5",
 
 --                  X"06",X"16",X"26",X"36",X"46",X"56",X"66",X"76",
 
 --                  X"86",X"96",X"A6",X"B6",X"C6",X"D6",X"E6",X"F6",
 
 --                  X"07",X"17",X"27",X"37",X"47",X"57",X"67",X"77",
 
 --                  X"87",X"97",X"A7",X"B7",X"C7",X"D7",X"E7",X"F7"));
 
    send_ACK  (usb);
 
    in_token(usb, X"02",X"1");
 
    wait_slv  (usb);
 
 -- recv_D0   (usb, (X"08",X"18",X"28",X"38",X"48",X"58",X"68",X"78",
 
 --                  X"88",X"98",X"A8",X"B8",X"C8",X"D8",X"E8",X"F8",
 
 --                  X"09",X"19",X"29",X"39",X"49",X"59",X"69",X"79",
 
 --                  X"89",X"99",X"A9",X"B9",X"C9",X"D9",X"E9",X"F9",
 
 --                  X"0A",X"1A",X"2A",X"3A",X"4A",X"5A",X"6A",X"7A",
 
 --                  X"8A",X"9A",X"AA",X"BA",X"CA",X"DA",X"EA",X"FA",
 
 --                  X"0B",X"1B",X"2B",X"3B",X"4B",X"5B",X"6B",X"7B",
 
 --                  X"8B",X"9B",X"AB",X"BB",X"CB",X"DB",X"EB",X"FB"));
 
    send_ACK  (usb);
 
    list("write and read 1x 64 bytes to - from engine 1");
 
    --**************************************************--
 
    list(T_No, 32);
 
    out_token(usb, X"02",X"1");
 
    send_D1   (usb, (X"C0",X"C1",X"C2",X"C3",X"C4",X"C5",X"C6",X"C7",
 
                     X"C8",X"C9",X"CA",X"CB",X"CC",X"CD",X"CE",X"CF",
 
                     X"D0",X"D1",X"D2",X"D3",X"D4",X"D5",X"D6",X"D7",
 
                     X"D8",X"D9",X"DA",X"DB",X"DC",X"DD",X"DE",X"DF",
 
                     X"E0",X"E1",X"E2",X"E3",X"E4",X"E5",X"E6",X"E7",
 
                     X"E8",X"E9",X"EA",X"EB",X"EC",X"ED",X"EE",X"EF",
 
                     X"F0",X"F1",X"F2",X"F3",X"F4",X"F5",X"F6",X"F7",
 
                     X"F8",X"F9",X"FA",X"FB",X"FC",X"FD",X"FE",X"FF"));
 
    wait_slv  (usb);
 
    list(T_No, 13);
 
    in_token(usb, X"02",X"1");
 
    wait_slv  (usb);
 
 -- recv_D1   (usb, (X"0C",X"1C",X"2C",X"3C",X"4C",X"5C",X"6C",X"7C",
 
 --                  X"8C",X"9C",X"AC",X"BC",X"CC",X"DC",X"EC",X"FC",
 
 --                  X"0D",X"1D",X"2D",X"3D",X"4D",X"5D",X"6D",X"7D",
 
 --                  X"8D",X"9D",X"AD",X"BD",X"CD",X"DD",X"ED",X"FD",
 
 --                  X"0E",X"1E",X"2E",X"3E",X"4E",X"5E",X"6E",X"7E",
 
 --                  X"8E",X"9E",X"AE",X"BE",X"CE",X"DE",X"EE",X"FE",
 
 --                  X"0F",X"1F",X"2F",X"3F",X"4F",X"5F",X"6F",X"7F",
 
 --                  X"8F",X"9F",X"AF",X"BF",X"CF",X"DF",X"EF",X"FF"));
 
    send_ACK  (usb);
 
    list(T_No, 14);
 
    list("test for more data - nothing");
 
    in_token(usb, X"02",X"1");
 
    wait_slv  (usb);
 
 -- recv_D0   (usb);
 
    send_ACK  (usb);
 
 
    list(T_No, 30);
 
    setup(usb, X"00", X"0");                                         --Setup to addr 0, endp 0 ..
 
    send_D0(usb,(X"00",X"05",X"03",X"00",X"00",X"00",X"00",X"00"));  -- .. 'Set Address'
 
    wait_slv(usb);                                                   --Recv ACK
 
    in_token(usb, X"00", X"0");                                      --Send IN-Token
 
    wait_slv(usb);                                                   --Recv Data0 zero Length
 
    send_ack(usb);                                                   --Send ACK
 
 
 
    --Now we may use the new address :
 
    list(T_No, 50);
 
    out_token(usb, X"03", X"1");                                     --Send Out-Token to Endpoint 1
 
    send_D0(usb, (X"11",X"22",X"33",X"44",X"55",X"66",X"77",X"88"));
 
    wait_slv(usb);
 
    list(T_No, 51);
 
    out_token(usb, X"03", X"1");                                     --Send Out-Token to Endpoint 1
 
    send_D0(usb, (X"11",X"12",X"13",X"14",X"15",X"16",X"17",X"18"));
 
    wait_slv(usb);
 
    TXcork <= '0';                                                   --Release TX buffer
 
    FOR i IN 0 TO 5 LOOP
 
      list(T_No, 60+i);
 
      in_token(usb, X"03", X"1");                                    --Send IN-Token to Endpoint 1
 
      wait_slv(usb);                                                 --Recv Data ?
 
      send_ack(usb);                                                 --Send ACK
 
    END LOOP;
 
 --   list(T_No, 70);
 
 --   in_token(usb, X"03", X"1");                                    --Send IN-Token to Endpoint 1
 
 --   wait_slv(usb);                                                 --Recv Data ?
 
 --   send_ack(usb);                                                 --Send ACK
 
    IF usb_busy THEN                                                 --is a usb_monitor signal
 
      WAIT UNTIL NOT usb_busy;
 
    END IF;
 
    WAIT FOR 300 ns;
 
    send_RES(usb);
 
    WAIT FOR 1 us;
 
    ASSERT FALSE REPORT"End of Test" SEVERITY FAILURE;
    ASSERT FALSE REPORT"End of Test" SEVERITY FAILURE;
  END PROCESS;
  END PROCESS;
 
 
  p_rd_data : PROCESS
 
    VARIABLE i : NATURAL := 0;
 
  BEGIN
 
  WAIT UNTIL rising_edge(clk);
 
  RXrdy <= '1';
 
  IF i < 8 THEN
 
    RXrdy <= '1';
 
    IF RXval ='1' THEN
 
      rd_data(i) <= RXdat;
 
    END IF;
 
  ELSE
 
    RXrdy <= '0';
 
  END IF;
 
  END PROCESS;
 
 
 
  p_wr_data : PROCESS
 
    VARIABLE i : NATURAL := 0;
 
  BEGIN
 
  WAIT UNTIL rising_edge(clk);
 
  IF i < 333 AND TXrdy ='1' and TX_load ='1' THEN
 
    TXval <= '1';
 
    TXdat <= CONV_STD_LOGIC_VECTOR(i,8);
 
    i := i +1;
 
  ELSE
 
    TXval  <= '0';
 
  END IF;
 
  END PROCESS;
 
 
 
END sim;
END sim;
 
 
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