Subversion Repositories copyblaze

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

-- Company: 

--

-- File: tb_copyBlaze_ecoSystem_wb-uart.vhd

--

-- Description:

--      projet copyblaze

--      copyBlaze_ecoSystem testbench

--

-- File history:

-- v1.0: 25/11/11: Creation

--

-- Targeted device: ProAsic A3P250 VQFP100

-- Author: AbdAllah Meziti

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

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

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

-- Entity: tb_copyBlaze_ecoSystem_wb_uart

--

-- Description:

--      

--      REMARQUE:

--

--      

-- History:

-- 25/11/11 AM: Creation

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

-- xx/xx/xx AM: 

--                              

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

entity tb_copyBlaze_ecoSystem_wb_uart is

end tb_copyBlaze_ecoSystem_wb_uart;

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

-- Architecture: behavior

-- of entity : tb_copyBlaze_ecoSystem_wb_uart

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

architecture behavior of tb_copyBlaze_ecoSystem_wb_uart is

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

        -- Définition des constantes

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

        -- Constant for testbench

        constant        CST_RESET_LENGTH        : positive := 7;

        constant        CST_MAX_CYCLES          : positive := 500;

        constant        CST_FREQ                        : integer       := 4;   -- Mhz

        constant        CST_PERIOD                      : time          := 1 us/CST_FREQ;

        -- Constant for the cp_copyBlaze_ecoSystem generic

        constant        CST_WIDTH_DATA          : positive := 8;

        constant        CST_WIDTH_PC            : positive := 10;

        constant        CST_WIDTH_INST          : positive := 18;

        constant        CST_DEPTH_STACK         : positive := 31;

        constant        CST_DEPTH_BANC          : positive := 16;

        constant        CST_DEPTH_SCRATCH       : positive := 64;

        constant        CST_INT_VECTOR          : std_ulogic_vector(11 downto 0) := x"3FF";

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

        -- Déclaration des composants

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

        component cp_copyBlaze_ecoSystem

                generic

                (

                        GEN_WIDTH_DATA          : positive := 8;

                        GEN_WIDTH_PC            : positive := 10;

                        GEN_WIDTH_INST          : positive := 18;

                        GEN_DEPTH_STACK         : positive := 15;       -- Taille (en octet) de la Stack

                        GEN_DEPTH_BANC          : positive := 16;       -- Taille (en octet) du Banc Register

                        GEN_DEPTH_SCRATCH       : positive := 64;       -- Taille (en octet) du Scratch Pad

                        GEN_INT_VECTOR          : std_ulogic_vector(11 downto 0) := x"3FF"

                );

                Port (

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

                        -- Signaux Systeme

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

                                Clk_i                           : in std_ulogic;

                                --Rst_i_n                               : in std_ulogic;

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

                        -- Signaux Fonctionels

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

                                Interrupt_i                     : in std_ulogic;

                                Interrupt_Ack_o         : out std_ulogic;

                                IN_PORT_i                       : in std_ulogic_vector(GEN_WIDTH_DATA-1 downto 0);

                                OUT_PORT_o                      : out std_ulogic_vector(GEN_WIDTH_DATA-1 downto 0);

                                PORT_ID_o                       : out std_ulogic_vector(GEN_WIDTH_DATA-1 downto 0);

                                READ_STROBE_o           : out std_ulogic;

                                WRITE_STROBE_o          : out std_ulogic;

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

                        -- Signaux WishBone

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

                                Freeze_i                        : in std_ulogic;

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

                        -- Signaux Wishbone Interface

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

                                --RST_I                         : in    std_ulogic;

                                --CLK_I                         : in    std_ulogic;

                                ADR_O                           : out   std_ulogic_vector(GEN_WIDTH_DATA-1 downto 0);

                                DAT_I                           : in    std_ulogic_vector(GEN_WIDTH_DATA-1 downto 0);

                                DAT_O                           : out   std_ulogic_vector(GEN_WIDTH_DATA-1 downto 0);

                                WE_O                            : out   std_ulogic;

                                SEL_O                           : out   std_ulogic_vector(1 downto 0);

                                STB_O                           : out   std_ulogic;

                                ACK_I                           : in    std_ulogic;

                                CYC_O                           : out   std_ulogic

                );

        end component;

        component wb_uart_8

                port (

                        clk        : in  std_ulogic;

                        reset      : in  std_ulogic;

                        -- Wishbone slave

                        wb_adr_i   : in  std_ulogic_vector( 7 downto 0);

                        wb_dat_i   : in  std_ulogic_vector( 7 downto 0);

                        wb_dat_o   : out std_ulogic_vector( 7 downto 0);

                        wb_cyc_i   : in  std_ulogic;

                        wb_stb_i   : in  std_ulogic;

                        wb_ack_o   : out std_ulogic;

                        wb_we_i    : in  std_ulogic;

                        wb_rxirq_o : out std_ulogic;

                        wb_txirq_o : out std_ulogic;

                        -- Serial I/O ports

                        uart_rx    : in  std_ulogic;

                        uart_tx    : out std_ulogic

                );

        end component;

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

        -- Définition des signaux interne

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

        signal iClk                             : std_ulogic := '0';

        signal iReset                   : std_ulogic;

        signal iResetN                  : std_ulogic;

        signal iInterrupt               : std_ulogic;

        signal iInterrupt_Ack   : std_ulogic;

        signal iIn_port                 : std_ulogic_vector(CST_WIDTH_DATA-1 downto 0);

        signal iOut_port                : std_ulogic_vector(CST_WIDTH_DATA-1 downto 0);

        signal iPort_id                 : std_ulogic_vector(CST_WIDTH_DATA-1 downto 0);

        signal iRead_strobe             : std_ulogic;

        signal iWrite_strobe    : std_ulogic;

        signal iFreeze                  : std_ulogic := '0'; -- Freeze the processor

        signal iReset_counter   : natural range 0 to CST_RESET_LENGTH := CST_RESET_LENGTH;       -- VERY BAD SOLUTION

        signal iCounter                 : std_ulogic_vector(CST_WIDTH_DATA-1 downto 0);

        signal iWaveForms               : std_ulogic_vector(CST_WIDTH_DATA-1 downto 0);

        signal iExtIntEvent             : std_ulogic;-- := '0';

        signal iWbSTB                   : std_ulogic;

        signal iWbCYC                   : std_ulogic;

        signal iWbACK                   : std_ulogic;-- := '0';--'0';

        signal iWbWE                    : std_ulogic;-- := '0';--'0';

        signal iWbDAT_I                 : std_ulogic_vector(CST_WIDTH_DATA-1 downto 0);

        signal iWbDAT_O                 : std_ulogic_vector(CST_WIDTH_DATA-1 downto 0);

        signal iWbADR                   : std_ulogic_vector(CST_WIDTH_DATA-1 downto 0);

begin

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

        -- UUT : Unit Under Test : cp_copyBlaze_ecoSystem --

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

        uut: cp_copyBlaze_ecoSystem

                generic map

                (

                        GEN_WIDTH_DATA          => CST_WIDTH_DATA,

                        GEN_WIDTH_PC            => CST_WIDTH_PC,

                        GEN_WIDTH_INST          => CST_WIDTH_INST,

                        GEN_DEPTH_STACK         => CST_DEPTH_STACK,

                        GEN_DEPTH_BANC          => CST_DEPTH_BANC,

                        GEN_DEPTH_SCRATCH       => CST_DEPTH_SCRATCH,

                        GEN_INT_VECTOR          => CST_INT_VECTOR

                )

                Port map

                (

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

                        -- Signaux Systeme

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

                                Clk_i                           => iClk,

                                --Rst_i_n                               : in std_ulogic;

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

                        -- Signaux Fonctionels

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

                                Interrupt_i                     => iExtIntEvent,--iInterrupt,

                                Interrupt_Ack_o         => iInterrupt_Ack,

                                IN_PORT_i                       => iIn_port,

                                OUT_PORT_o                      => iOut_port,

                                PORT_ID_o                       => iPort_id,

                                READ_STROBE_o           => iRead_strobe,

                                WRITE_STROBE_o          => iWrite_strobe,

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

                        -- Signaux WishBone

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

                                Freeze_i                        => iFreeze,

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

                        -- Signaux Wishbone Interface

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

                                --RST_I                         => iReset,

                                --CLK_I                         => Clk_i,

                                ADR_O                           => iWbADR,

                                DAT_I                           => iWbDAT_I,--(others => '0'),

                                DAT_O                           => iWbDAT_O,--open,

                                WE_O                            => iWbWE,--open,

                                SEL_O                           => open,

                                STB_O                           => iWbSTB,

                                ACK_I                           => iWbACK,

                                CYC_O                           => iWbCYC

                );

        wb_uart : wb_uart_8

                port map(

                        clk        => iClk,

                        reset      => iResetN,

                        -- Wishbone slave

                        wb_adr_i   => iWbADR,

                        wb_dat_i   => iWbDAT_O,

                        wb_dat_o   => iWbDAT_I,

                        wb_cyc_i   => iWbCYC,

                        wb_stb_i   => iWbSTB,

                        wb_ack_o   => iWbACK,

                        wb_we_i    => iWbWE,

                        wb_rxirq_o => open,

                        wb_txirq_o => iExtIntEvent,

                        -- Serial I/O ports

                        uart_rx    => '1',

                        uart_tx    => open

                );

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

        -- Process : Interrupt_Proc

        -- Description: Interrupt Logic for cp_copyBlaze_ecoSystem

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

        Interrupt_Proc: process(iReset, iClk)

        begin

                if (iReset='0') then

                        iInterrupt      <= '0';

                elsif ( rising_edge(iClk) ) then

                        if (iExtIntEvent='1') then

                                iInterrupt      <= '1';

                        elsif (iInterrupt_Ack='1') then

                                iInterrupt      <= '0';

                        end if;

                end if;

        end process Interrupt_Proc;

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

        -- Process : Reset_Proc

        -- Description: Reset Logic for cp_copyBlaze_ecoSystem

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

        Reset_Proc: process(iClk)

        begin

                -- delayed iReset circuit

                if ( rising_edge(iClk) ) then

                        if ( iReset_counter = 0 ) then

                                iReset                  <=      '1';

                        else

                                iReset                  <=      '0';

                                iReset_counter  <=      iReset_counter - 1;

                        end if;

                end if;

        end process Reset_Proc;

        iResetN <=      not(iReset);

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

        -- Process : IO_Proc

        -- Description: adding the output registers to the processor

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

        IO_Proc: process(iClk)

        begin

                -- waveform register at iAddress 02

                if ( rising_edge(iClk) ) then

                        if (iPort_id(1)='1' and iWrite_strobe='1') then

                                iWaveForms <= iOut_port;

                        end if;

                end if;

                -- Interrupt iCounter register at iAddress 04

                if ( rising_edge(iClk) ) then

                        if (iPort_id(2)='1' and iWrite_strobe='1') then

                                iCounter <= iOut_port;

                        end if;

                end if;

        end process IO_Proc;

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

        -- STIMULIS FOR THE TEST --

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

        -- Unused inputs on processor

        iIn_port        <= x"28";

        --iClk <= not iClk after 0.5 * CST_PERIOD;

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

        -- Process : INT_Proc

        -- Description: Nominal 100MHz clock which also defines number of cycles in simulation 

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

        INT_Proc : process

                variable max_cycles             : integer :=    CST_MAX_CYCLES;

                variable cycle_count    : integer :=    0;

        begin

                -- Define the clock cycles and the clock cycle iCounter

                while cycle_count < max_cycles loop

--                      wait until rising_edge(iClk) ;

                                iClk <= '0';

                        wait for CST_PERIOD;

                                iClk <= '1';

                                cycle_count := cycle_count + 1;

                        wait for CST_PERIOD;

                        --Now define stimulus relative to a given clock cycle

                        case cycle_count is

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

                                -- INTERRUPT EVENT --

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

                                --when 30 =>    iExtIntEvent <= '1'; 

                                --when 34 =>    iExtIntEvent <= '0'; 

                --

                                --when 67 =>    iExtIntEvent <= '1'; -- Take care when the "iIE" bit is not set. In this case how to manage Interrupt_Ack_o

                                --when 71 =>    iExtIntEvent <= '0'; 

                                --when 300 =>           iExtIntEvent <= '1'; 

                                --when 304 =>           iExtIntEvent <= '0'; 

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

                                -- FREEZE EVENT --

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

                                when 130 =>             iFreeze <= '1';

                                when 150 =>             iFreeze <= '0';

                                -- ****** --

                                -- WB ACK --

                                -- ****** --

                                --when 420      =>              iWbACK  <= '1';

                                --when 420+1    =>              iWbACK  <= '0';

                                when others =>  --iExtIntEvent <= iExtIntEvent;   -- hold last defined value

                        end case;

                end loop;

                wait; -- end of simulation.

        end process INT_Proc;

end behavior;