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

-- user_logic.vhd - entity/architecture pair

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

--

-- ***************************************************************************

-- ** Copyright (c) 1995-2009 Xilinx, Inc.  All rights reserved.            **

-- **                                                                       **

-- ** Xilinx, Inc.                                                          **

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-- ** SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,        **

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-- ** WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE               **

-- ** IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR        **

-- ** REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF       **

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-- ** FOR A PARTICULAR PURPOSE.                                             **

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-- ***************************************************************************

--

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

-- Filename:          user_logic.vhd

-- Version:           2.00.a

-- Description:       User logic.

-- Date:              Thu May 03 09:53:36 2012 (by Create and Import Peripheral Wizard)

-- VHDL Standard:     VHDL'93

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

-- Naming Conventions:

--   active low signals:                    "*_n"

--   clock signals:                         "clk", "clk_div#", "clk_#x"

--   reset signals:                         "rst", "rst_n"

--   generics:                              "C_*"

--   user defined types:                    "*_TYPE"

--   state machine next state:              "*_ns"

--   state machine current state:           "*_cs"

--   combinatorial signals:                 "*_com"

--   pipelined or register delay signals:   "*_d#"

--   counter signals:                       "*cnt*"

--   clock enable signals:                  "*_ce"

--   internal version of output port:       "*_i"

--   device pins:                           "*_pin"

--   ports:                                 "- Names begin with Uppercase"

--   processes:                             "*_PROCESS"

--   component instantiations:              "<ENTITY_>I_<#|FUNC>"

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

-- DO NOT EDIT BELOW THIS LINE --------------------

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_arith.all;

use ieee.std_logic_unsigned.all;

library proc_common_v3_00_a;

use proc_common_v3_00_a.proc_common_pkg.all;

-- DO NOT EDIT ABOVE THIS LINE --------------------

--USER libraries added here

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

-- Entity section

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

-- Definition of Generics:

--   C_SLV_AWIDTH                 -- Slave interface address bus width

--   C_SLV_DWIDTH                 -- Slave interface data bus width

--   C_NUM_REG                    -- Number of software accessible registers

--   C_NUM_MEM                    -- Number of memory spaces

--   C_NUM_INTR                   -- Number of interrupt event

--

-- Definition of Ports:

--   Bus2IP_Clk                   -- Bus to IP clock

--   Bus2IP_Reset                 -- Bus to IP reset

--   Bus2IP_Addr                  -- Bus to IP address bus

--   Bus2IP_CS                    -- Bus to IP chip select for user logic memory selection

--   Bus2IP_RNW                   -- Bus to IP read/not write

--   Bus2IP_Data                  -- Bus to IP data bus

--   Bus2IP_BE                    -- Bus to IP byte enables

--   Bus2IP_RdCE                  -- Bus to IP read chip enable

--   Bus2IP_WrCE                  -- Bus to IP write chip enable

--   IP2Bus_Data                  -- IP to Bus data bus

--   IP2Bus_RdAck                 -- IP to Bus read transfer acknowledgement

--   IP2Bus_WrAck                 -- IP to Bus write transfer acknowledgement

--   IP2Bus_Error                 -- IP to Bus error response

--   IP2Bus_IntrEvent             -- IP to Bus interrupt event

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

entity user_logic is

  generic

  (

    -- ADD USER GENERICS BELOW THIS LINE ---------------

    --USER generics added here

    -- ADD USER GENERICS ABOVE THIS LINE ---------------

    -- DO NOT EDIT BELOW THIS LINE ---------------------

    -- Bus protocol parameters, do not add to or delete

    C_SLV_AWIDTH                   : integer              := 32;

    C_SLV_DWIDTH                   : integer              := 32;

    C_NUM_REG                      : integer              := 1;

    C_NUM_MEM                      : integer              := 6;

    C_NUM_INTR                     : integer              := 1

    -- DO NOT EDIT ABOVE THIS LINE ---------------------

  );

  port

  (

    -- ADD USER PORTS BELOW THIS LINE ------------------

    --USER ports added here

         calc_time                      : out std_logic;

        -- ctrl_sigs                      : out std_logic_vector( downto );

    -- ADD USER PORTS ABOVE THIS LINE ------------------

    -- DO NOT EDIT BELOW THIS LINE ---------------------

    -- Bus protocol ports, do not add to or delete

    Bus2IP_Clk                     : in  std_logic;

    Bus2IP_Reset                   : in  std_logic;

    Bus2IP_Addr                    : in  std_logic_vector(0 to C_SLV_AWIDTH-1);

    Bus2IP_CS                      : in  std_logic_vector(0 to C_NUM_MEM-1);

    Bus2IP_RNW                     : in  std_logic;

    Bus2IP_Data                    : in  std_logic_vector(0 to C_SLV_DWIDTH-1);

    Bus2IP_BE                      : in  std_logic_vector(0 to C_SLV_DWIDTH/8-1);

    Bus2IP_RdCE                    : in  std_logic_vector(0 to C_NUM_REG-1);

    Bus2IP_WrCE                    : in  std_logic_vector(0 to C_NUM_REG-1);

    IP2Bus_Data                    : out std_logic_vector(0 to C_SLV_DWIDTH-1);

    IP2Bus_RdAck                   : out std_logic;

    IP2Bus_WrAck                   : out std_logic;

    IP2Bus_Error                   : out std_logic;

    IP2Bus_IntrEvent               : out std_logic_vector(0 to C_NUM_INTR-1)

    -- DO NOT EDIT ABOVE THIS LINE ---------------------

  );

  attribute SIGIS : string;

  attribute SIGIS of Bus2IP_Clk    : signal is "CLK";

  attribute SIGIS of Bus2IP_Reset  : signal is "RST";

end entity user_logic;

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

-- Architecture section

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

architecture IMP of user_logic is

  --USER signal declarations added here, as needed for user logic

  component multiplier_core

    port(          clk : in  std_logic;

                      reset : in  std_logic;

                        -- operand memory interface (plb shared memory)

                         write_enable : in  std_logic;

               data_in : in  std_logic_vector (31 downto 0);

            rw_address : in  std_logic_vector (8 downto 0);

              data_out : out std_logic_vector (31 downto 0);

                                 collision : out std_logic;

                        -- op_sel fifo interface

                             fifo_din : in  std_logic_vector (31 downto 0);

                            fifo_push : in  std_logic;

                            fifo_full : out std_logic;

                          fifo_nopush : out std_logic;

                        -- ctrl signals

                                start : in  std_logic;

                             run_auto : in  std_logic;

                                ready : out std_logic;

                    x_sel_single : in  std_logic_vector (1 downto 0);

                    y_sel_single : in  std_logic_vector (1 downto 0);

                  dest_op_single : in  std_logic_vector (1 downto 0);

                 p_sel : in  std_logic_vector (1 downto 0);

                                 calc_time : out std_logic

        );

  end component;

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

  -- Signals for multiplier core slave model s/w accessible register

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

  signal slv_reg0                       : std_logic_vector(0 to C_SLV_DWIDTH-1);

  signal slv_reg_write_sel              : std_logic_vector(0 to 0);

  signal slv_reg_read_sel               : std_logic_vector(0 to 0);

  signal slv_ip2bus_data                : std_logic_vector(0 to C_SLV_DWIDTH-1);

  signal slv_read_ack                   : std_logic;

  signal slv_write_ack                  : std_logic;

  signal load_flags                     : std_logic;

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

  -- Signals for multiplier core interrupt

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

  signal core_interrupt                 : std_logic_vector(0 to 0);

  signal core_fifo_full                : std_logic;

  signal core_fifo_nopush               : std_logic;

  signal core_ready                     : std_logic;

  signal core_mem_collision             : std_logic;

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

  -- Signals for multiplier core control

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

  signal core_start                     : std_logic;

  signal core_run_auto                  : std_logic;

  signal core_p_sel                     : std_logic_vector(1 downto 0);

  signal core_dest_op_single            : std_logic_vector(1 downto 0);

  signal core_x_sel_single              : std_logic_vector(1 downto 0);

  signal core_y_sel_single              : std_logic_vector(1 downto 0);

  signal core_flags                     : std_logic_vector(15 downto 0);

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

  -- Signals for multiplier core memory space

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

  signal mem_address                    : std_logic_vector(0 to 5);

  signal mem_select                     : std_logic_vector(0 to 5);

  signal mem_read_enable                : std_logic;

  signal mem_read_enable_dly1           : std_logic;

  signal mem_read_req                   : std_logic;

  signal mem_ip2bus_data                : std_logic_vector(0 to C_SLV_DWIDTH-1);

  signal mem_read_ack_dly1              : std_logic;

  signal mem_read_ack                   : std_logic;

  signal mem_write_ack                  : std_logic;

  signal core_rw_address                : std_logic_vector (8 downto 0);

  signal core_data_in                   : std_logic_vector(31 downto 0);

  signal core_fifo_din                  : std_logic_vector(31 downto 0);

  signal sel_mno                        : std_logic;

  signal sel_op                         : std_logic_vector(1 downto 0);

  signal core_data_out                  : std_logic_vector(31 downto 0);

  signal core_write_enable              : std_logic;

  signal core_fifo_push                 : std_logic;

begin

  --USER logic implementation added here

  --ctrl_sigs <= 

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

  -- Example code to read/write user logic slave model s/w accessible registers

  -- 

  -- Note:

  -- The example code presented here is to show you one way of reading/writing

  -- software accessible registers implemented in the user logic slave model.

  -- Each bit of the Bus2IP_WrCE/Bus2IP_RdCE signals is configured to correspond

  -- to one software accessible register by the top level template. For example,

  -- if you have four 32 bit software accessible registers in the user logic,

  -- you are basically operating on the following memory mapped registers:

  -- 

  --    Bus2IP_WrCE/Bus2IP_RdCE   Memory Mapped Register

  --                     "1000"   C_BASEADDR + 0x0

  --                     "0100"   C_BASEADDR + 0x4

  --                     "0010"   C_BASEADDR + 0x8

  --                     "0001"   C_BASEADDR + 0xC

  -- 

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

  slv_reg_write_sel <= Bus2IP_WrCE(0 to 0);

  slv_reg_read_sel  <= Bus2IP_RdCE(0 to 0);

  slv_write_ack     <= Bus2IP_WrCE(0);

  slv_read_ack      <= Bus2IP_RdCE(0);

  -- implement slave model software accessible register(s)

  SLAVE_REG_WRITE_PROC : process( Bus2IP_Clk ) is

  begin

    if Bus2IP_Clk'event and Bus2IP_Clk = '1' then

      if Bus2IP_Reset = '1' then

        slv_reg0 <= (others => '0');

      elsif load_flags = '1' then

                  slv_reg0 <= slv_reg0(0 to 15) & core_flags;

                else

        case slv_reg_write_sel is

          when "1" =>

            for byte_index in 0 to (C_SLV_DWIDTH/8)-1 loop

              if ( Bus2IP_BE(byte_index) = '1' ) then

                slv_reg0(byte_index*8 to byte_index*8+7) <= Bus2IP_Data(byte_index*8 to byte_index*8+7);

              end if;

            end loop;

          when others => null;

        end case;

      end if;

    end if;

  end process SLAVE_REG_WRITE_PROC;

  -- implement slave model software accessible register(s) read mux

  SLAVE_REG_READ_PROC : process( slv_reg_read_sel, slv_reg0 ) is

  begin

    case slv_reg_read_sel is

      when "1" => slv_ip2bus_data <= slv_reg0;

      when others => slv_ip2bus_data <= (others => '0');

    end case;

  end process SLAVE_REG_READ_PROC;

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

  -- Multiplier core interrupts form IP core interrupt

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

  core_interrupt(0) <= core_ready or core_mem_collision or core_fifo_full or core_fifo_nopush;

  IP2Bus_IntrEvent <= core_interrupt;

  FLAGS_CNTRL_PROC: process(Bus2IP_Clk, Bus2IP_Reset) is

  begin

    if Bus2IP_Reset = '1' then

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

                load_flags <= '0';

    elsif rising_edge(Bus2IP_Clk) then

           if core_start = '1' then

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

                else

                  if core_ready = '1' then

                    core_flags(15) <= '1';

                  else

                    core_flags(15) <= core_flags(15);

                  end if;

                  if core_mem_collision = '1' then

                    core_flags(14) <= '1';

                  else

                    core_flags(14) <= core_flags(14);

                  end if;

                  if core_fifo_full = '1' then

                         core_flags(13) <= '1';

                  else

                    core_flags(13) <= core_flags(13);

                  end if;

                  if core_fifo_nopush = '1' then

                         core_flags(12) <= '1';

                  else

                    core_flags(12) <= core_flags(12);

                  end if;

                end if;

                --

                load_flags <= core_interrupt(0);

         end if;

  end process FLAGS_CNTRL_PROC;

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

  -- Example code to access user logic memory region

  -- 

  -- Note:

  -- The example code presented here is to show you one way of using

  -- the user logic memory space features. The Bus2IP_Addr, Bus2IP_CS,

  -- and Bus2IP_RNW IPIC signals are dedicated to these user logic

  -- memory spaces. Each user logic memory space has its own address

  -- range and is allocated one bit on the Bus2IP_CS signal to indicated

  -- selection of that memory space. Typically these user logic memory

  -- spaces are used to implement memory controller type cores, but it

  -- can also be used in cores that need to access additional address space

  -- (non C_BASEADDR based), s.t. bridges. This code snippet infers

  -- 6 256x32-bit (byte accessible) single-port Block RAM by XST.

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

  mem_select      <= Bus2IP_CS;

  mem_read_enable <= ( Bus2IP_CS(0) or Bus2IP_CS(1) or Bus2IP_CS(2) or Bus2IP_CS(3) or Bus2IP_CS(4) or Bus2IP_CS(5) ) and Bus2IP_RNW;

  mem_read_ack    <= mem_read_ack_dly1;

  mem_write_ack   <= ( Bus2IP_CS(0) or Bus2IP_CS(1) or Bus2IP_CS(2) or Bus2IP_CS(3) or Bus2IP_CS(4) or Bus2IP_CS(5) ) and not(Bus2IP_RNW);

  mem_address     <= Bus2IP_Addr(C_SLV_AWIDTH-8 to C_SLV_AWIDTH-3);

  -- implement single clock wide read request

  mem_read_req    <= mem_read_enable and not(mem_read_enable_dly1);

  BRAM_RD_REQ_PROC : process( Bus2IP_Clk ) is

  begin

    if ( Bus2IP_Clk'event and Bus2IP_Clk = '1' ) then

      if ( Bus2IP_Reset = '1' ) then

        mem_read_enable_dly1 <= '0';

      else

        mem_read_enable_dly1 <= mem_read_enable;

      end if;

    end if;

  end process BRAM_RD_REQ_PROC;

  -- this process generates the read acknowledge 1 clock after read enable

  -- is presented to the BRAM block. The BRAM block has a 1 clock delay

  -- from read enable to data out.

  BRAM_RD_ACK_PROC : process( Bus2IP_Clk ) is

  begin

    if ( Bus2IP_Clk'event and Bus2IP_Clk = '1' ) then

      if ( Bus2IP_Reset = '1' ) then

        mem_read_ack_dly1 <= '0';

      else

        mem_read_ack_dly1 <= mem_read_req;

      end if;

    end if;

  end process BRAM_RD_ACK_PROC;

    -- address logic

  Sel_MNO <= mem_select(0);

  with mem_select(1 to 4) select

    Sel_Op <= "00" when "1000",

                   "01" when "0100",

                                  "10" when "0010",

                                  "11" when others;

  core_rw_address <= Sel_MNO & Sel_Op & mem_address;

  -- data-in

  core_data_in <= Bus2IP_Data;

  core_fifo_din <= Bus2IP_Data;

  core_write_enable <= (Bus2IP_CS(0) or Bus2IP_CS(1) or Bus2IP_CS(2) or Bus2IP_CS(3) or Bus2IP_CS(4)) and (not Bus2IP_RNW);

  core_fifo_push <= Bus2IP_CS(5) and (not Bus2IP_RNW);

  -- no read mux required, we can only read from core_data_out

  mem_ip2bus_data <= core_data_out;

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

  -- Map slv_reg0 bits to core control signals 

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

  core_start <= slv_reg0(8);

  core_run_auto <= slv_reg0(9);

  core_p_sel <= slv_reg0(0 to 1);

  core_dest_op_single <= slv_reg0(2 to 3);

  core_x_sel_single <= slv_reg0(4 to 5);

  core_y_sel_single <= slv_reg0(6 to 7);

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

  -- Multiplier core instance

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

  the_multiplier: multiplier_core

  port map(        clk => Bus2IP_Clk, -- v

                      reset => Bus2IP_Reset, -- v

                        -- operand memory interface (plb shared memory)

                         write_enable => core_write_enable,

               data_in => core_data_in,

            rw_address => core_rw_address,

              data_out => core_data_out,

                                 collision => core_mem_collision, -- v

                        -- op_sel fifo interface

                             fifo_din => core_fifo_din,

                            fifo_push => core_fifo_push,

                            fifo_full => core_fifo_full, -- v

                          fifo_nopush => core_fifo_nopush, -- v

                        -- ctrl signals

                                start => core_start, -- v

                             run_auto => core_run_auto, -- v

                                ready => core_ready, -- v

                    x_sel_single => core_x_sel_single, -- v

                    y_sel_single => core_y_sel_single, -- v

                  dest_op_single => core_dest_op_single, -- v

                 p_sel => core_p_sel, -- v

                                 calc_time => calc_time -- v

  );

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

  -- Drive IP to Bus signals

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

  IP2Bus_Data  <= slv_ip2bus_data when slv_read_ack = '1' else

                  mem_ip2bus_data when mem_read_ack = '1' else

                  (others => '0');

  IP2Bus_WrAck <= slv_write_ack or mem_write_ack;

  IP2Bus_RdAck <= slv_read_ack or mem_read_ack;

  IP2Bus_Error <= '0';

end IMP;