Subversion Repositories minsoc

`include "minsoc_bench_defines.v"

`include "minsoc_defines.v"

`include "or1200_defines.v"

`include "timescale.v"

module minsoc_bench();

`ifdef POSITIVE_RESET

    localparam RESET_LEVEL = 1'b1;

`elsif NEGATIVE_RESET

    localparam RESET_LEVEL = 1'b0;

`else

    localparam RESET_LEVEL = 1'b1;

`endif

reg clock, reset;

//Debug interface

wire dbg_tms_i;

wire dbg_tck_i;

wire dbg_tdi_i;

wire dbg_tdo_o;

wire jtag_vref;

wire jtag_gnd;

//SPI wires

wire spi_mosi;

reg spi_miso;

wire spi_sclk;

wire [1:0] spi_ss;

//UART wires

wire uart_stx;

reg uart_srx;

//ETH wires

reg eth_col;

reg eth_crs;

wire eth_trst;

reg eth_tx_clk;

wire eth_tx_en;

wire eth_tx_er;

wire [3:0] eth_txd;

reg eth_rx_clk;

reg eth_rx_dv;

reg eth_rx_er;

reg [3:0] eth_rxd;

reg eth_fds_mdint;

wire eth_mdc;

wire eth_mdio;

//

//      TASKS registers to communicate with interfaces

//

reg design_ready;

reg uart_echo;

`ifdef UART

reg [40*8-1:0] line;

reg [12*8-1:0] hello;

reg new_line;

reg new_char;

reg flush_line;

`endif

`ifdef ETHERNET

reg [7:0] eth_rx_data [0:1535];            //receive buffer ETH (max packet 1536)

reg [7:0] eth_tx_data [0:1535];     //send buffer ETH (max packet 1536)

localparam ETH_HDR = 14;

localparam ETH_PAYLOAD_MAX_LENGTH = 1518;//only able to send up to 1536 bytes with header (14 bytes) and CRC (4 bytes)

`endif

//

// Testbench mechanics

//

reg [7:0] program_mem[(1<<(`MEMORY_ADR_WIDTH+2))-1:0];

integer initialize, ptr;

reg [8*64:0] file_name;

integer      firmware_size;  // Note that the .hex file size is greater than this, as each byte in the file needs 2 hex characters.

integer      firmware_size_in_header;

reg load_file;

initial begin

    reset = ~RESET_LEVEL;

    clock = 1'b0;

        eth_tx_clk = 1'b0;

        eth_rx_clk = 1'b0;

    design_ready = 1'b0;

    uart_echo = 1'b1;

`ifndef NO_CLOCK_DIVISION

    minsoc_top_0.clk_adjust.clk_int = 1'b0;

    minsoc_top_0.clk_adjust.clock_divisor = 32'h0000_0000;

`endif

    uart_srx = 1'b1;

        eth_col = 1'b0;

        eth_crs = 1'b0;

        eth_fds_mdint = 1'b1;

        eth_rx_er = 1'b0;

        eth_rxd = 4'h0;

        eth_rx_dv = 1'b0;

//dual and two port rams from FPGA memory instances have to be initialized to 0

    init_fpga_memory();

        load_file = 1'b0;

`ifdef INITIALIZE_MEMORY_MODEL

        load_file = 1'b1;

`endif

`ifdef START_UP

        load_file = 1'b1;

`endif

        //get firmware hex file from command line input

        if ( load_file ) begin

                if ( ! $value$plusargs("file_name=%s", file_name) || file_name == 0 ) begin

                        $display("ERROR: Please specify the name of the firmware file to load on start-up.");

                        $finish;

                end

        // We are passing the firmware size separately as a command-line argument in order

        // to avoid this kind of Icarus Verilog warnings:

        //   WARNING: minsoc_bench_core.v:111: $readmemh: Standard inconsistency, following 1364-2005.

        //   WARNING: minsoc_bench_core.v:111: $readmemh(../../sw/uart/uart.hex): Not enough words in the file for the requested range [0:32767].

        // Apparently, some of the $readmemh() warnigns are even required by the standard. The trouble is,

        // Verilog's $fread() is not widely implemented in the simulators, so from Verilog alone

        // it's not easy to read the firmware file header without getting such warnings.

                if ( ! $value$plusargs("firmware_size=%d", firmware_size) ) begin

                        $display("ERROR: Please specify the size of the firmware (in bytes) contained in the hex firmware file.");

                        $finish;

                end

                $readmemh(file_name, program_mem, 0, firmware_size - 1);

                firmware_size_in_header = { program_mem[0] , program_mem[1] , program_mem[2] , program_mem[3] };

        if ( firmware_size != firmware_size_in_header ) begin

                        $display("ERROR: The firmware size in the file header does not match the firmware size given as command-line argument. Did you forget bin2hex's -size_word flag when generating the firmware file?");

                        $finish;

        end

        end

`ifdef INITIALIZE_MEMORY_MODEL

        // Initialize memory with firmware

        initialize = 0;

        while ( initialize < firmware_size ) begin

                minsoc_top_0.onchip_ram_top.block_ram_3.mem[initialize/4] = program_mem[initialize];

                minsoc_top_0.onchip_ram_top.block_ram_2.mem[initialize/4] = program_mem[initialize+1];

                minsoc_top_0.onchip_ram_top.block_ram_1.mem[initialize/4] = program_mem[initialize+2];

                minsoc_top_0.onchip_ram_top.block_ram_0.mem[initialize/4] = program_mem[initialize+3];

        initialize = initialize + 4;

        end

        $display("Memory model initialized with firmware:");

        $display("%s", file_name);

        $display("%d Bytes loaded from %d ...", initialize , firmware_size);

`endif

    // Reset controller

    repeat (2) @ (negedge clock);

    reset = RESET_LEVEL;

    repeat (16) @ (negedge clock);

    reset = ~RESET_LEVEL;

`ifdef START_UP

        // Pass firmware over spi to or1k_startup

        ptr = 0;

        //read dummy

        send_spi(program_mem[ptr]);

        send_spi(program_mem[ptr]);

        send_spi(program_mem[ptr]);

        send_spi(program_mem[ptr]);

        //~read dummy

        while ( ptr < firmware_size ) begin

                send_spi(program_mem[ptr]);

                ptr = ptr + 1;

        end

        $display("Memory start-up completed...");

        $display("Loaded firmware:");

        $display("%s", file_name);

`endif

        //

    // Testbench START

        //

    design_ready = 1'b1;

    $display("Running simulation: if you want to stop it, type ctrl+c and type in finish afterwards.");

    fork

        begin

`ifdef UART

`ifdef ETHERNET

`ifdef TEST_ETHERNET

            $display("Testing Ethernet firmware, this takes long (~15 min. @ 2.53 GHz dual-core)...");

            $display("Ethernet firmware encloses UART firmware, testing UART firmware first...");

            test_uart();

            test_eth();

            $display("Stopping simulation.");

            $finish;

`endif

`endif

`ifdef TEST_UART

            $display("Testing UART firmware, this takes a while (~1 min. @ 2.53 GHz dual-core)...");

            test_uart();

            $display("Stopping simulation.");

            $finish;

`endif

`endif

        end

        begin

`ifdef ETHERNET

`ifdef TEST_ETHERNET

            get_mac();

            if ( { eth_rx_data[ETH_HDR] , eth_rx_data[ETH_HDR+1] , eth_rx_data[ETH_HDR+2] , eth_rx_data[ETH_HDR+3] } == 32'hFF2B4050 )

                $display("Ethernet firmware started correctly.");

`endif

`endif

        end

    join

end

//

// Modules instantiations

//

minsoc_top minsoc_top_0(

   .clk(clock),

   .reset(reset)

   //JTAG ports

`ifdef GENERIC_TAP

   , .jtag_tdi(dbg_tdi_i),

   .jtag_tms(dbg_tms_i),

   .jtag_tck(dbg_tck_i),

   .jtag_tdo(dbg_tdo_o),

   .jtag_vref(jtag_vref),

   .jtag_gnd(jtag_gnd)

`endif

   //SPI ports

`ifdef START_UP

   , .spi_flash_mosi(spi_mosi),

   .spi_flash_miso(spi_miso),

   .spi_flash_sclk(spi_sclk),

   .spi_flash_ss(spi_ss)

`endif

   //UART ports

`ifdef UART

   , .uart_stx(uart_stx),

   .uart_srx(uart_srx)

`endif // !UART

        // Ethernet ports

`ifdef ETHERNET

        , .eth_col(eth_col),

    .eth_crs(eth_crs),

    .eth_trste(eth_trst),

    .eth_tx_clk(eth_tx_clk),

        .eth_tx_en(eth_tx_en),

    .eth_tx_er(eth_tx_er),

    .eth_txd(eth_txd),

    .eth_rx_clk(eth_rx_clk),

        .eth_rx_dv(eth_rx_dv),

    .eth_rx_er(eth_rx_er),

    .eth_rxd(eth_rxd),

    .eth_fds_mdint(eth_fds_mdint),

        .eth_mdc(eth_mdc),

    .eth_mdio(eth_mdio)

`endif // !ETHERNET

);

`ifdef VPI_DEBUG

        dbg_comm_vpi dbg_if(

                .SYS_CLK(clock),

                .P_TMS(dbg_tms_i),

                .P_TCK(dbg_tck_i),

                .P_TRST(),

                .P_TDI(dbg_tdi_i),

                .P_TDO(dbg_tdo_o)

        );

`else

   assign dbg_tdi_i = 1;

   assign dbg_tck_i = 0;

   assign dbg_tms_i = 1;

`endif

//

// Firmware testers

//

`ifdef UART

task test_uart();

    begin

            @ (posedge new_line);

            $display("UART data received.");

            hello = line[12*8-1:0];

            //sending character A to UART, B expected

            $display("Testing UART interrupt...");

            uart_echo = 1'b0;

            uart_send(8'h41);       //Character A

            @ (posedge new_char);

            if ( line[7:0] == "B" )

                $display("UART interrupt working.");

            else

                $display("UART interrupt failed. B was expected, %c was received.", line[7:0]);

            uart_echo = 1'b1;

            if ( hello == "Hello World." )

                $display("UART firmware test completed, behaving correctly.");

            else

                $display("UART firmware test completed, failed.");

    end

endtask

`endif

`ifdef ETHERNET

task test_eth();

    begin

                eth_tx_data[ETH_HDR+0] = 8'hBA;

                eth_tx_data[ETH_HDR+1] = 8'h87;

                eth_tx_data[ETH_HDR+2] = 8'hAA;

                eth_tx_data[ETH_HDR+3] = 8'hBB;

                eth_tx_data[ETH_HDR+4] = 8'hCC;

                eth_tx_data[ETH_HDR+5] = 8'hDD;

            $display("Sending an Ethernet package to the system and waiting for the data to be output through UART...");

                send_mac(6);

            repeat(3+40) @ (posedge new_line);

            $display("Ethernet test completed.");

    end

endtask

`endif

//

//      Regular clocking and output

//

always begin

    #((`CLK_PERIOD)/2) clock <= ~clock;

end

`ifdef WAVEFORM_OUTPUT

initial begin

        $dumpfile("../results/minsoc_wave.lxt2");

        $dumpvars();

end

`endif

//

//      Functionalities tasks: SPI Startup and UART Monitor

//

//SPI START_UP

`ifdef START_UP

task send_spi;

    input [7:0] data_in;

    integer i;

    begin

        i = 7;

        for ( i = 7 ; i >= 0; i = i - 1 ) begin

                spi_miso = data_in[i];

                        @ (posedge spi_sclk);

            end

    end

endtask

`endif

//~SPI START_UP

//UART

`ifdef UART

localparam UART_TX_WAIT = (`FREQ_NUM_FOR_NS / `UART_BAUDRATE);

task uart_send;

    input [7:0] data;

    integer i;

    begin

        uart_srx = 1'b0;

        #UART_TX_WAIT;

        for ( i = 0; i < 8 ; i = i + 1 ) begin

                    uart_srx = data[i];

            #UART_TX_WAIT;

            end

        uart_srx = 1'b0;

        #UART_TX_WAIT;

            uart_srx = 1'b1;

    end

endtask

//UART Monitor (prints uart output on the terminal)

// Something to trigger the task

initial

begin

    new_line = 1'b0;

    new_char = 1'b0;

    flush_line = 1'b0;

end

always @ (posedge clock)

    if ( design_ready )

        uart_decoder;

task uart_decoder;

        integer i;

        reg [7:0] tx_byte;

        begin

        new_char = 1'b0;

        new_line = 1'b0;

        // Wait for start bit

        while (uart_stx == 1'b1)

        @(uart_stx);

        #(UART_TX_WAIT + (UART_TX_WAIT/2));

        for ( i = 0; i < 8 ; i = i + 1 ) begin

            tx_byte[i] = uart_stx;

            #UART_TX_WAIT;

        end

        //Check for stop bit

        if (uart_stx == 1'b0) begin

            //$display("* WARNING: user stop bit not received when expected at time %d__", $time);

            // Wait for return to idle

            while (uart_stx == 1'b0)

            @(uart_stx);

            //$display("* USER UART returned to idle at time %d",$time);

        end

        // display the char

        if ( uart_echo )

            $write("%c", tx_byte);

        if ( flush_line ) begin

            line = "";

            flush_line = 1'b0;

        end

        if ( tx_byte == "\n" ) begin

            new_line = 1'b1;

            flush_line = 1'b1;

        end

        else begin

            line = { line[39*8-1:0], tx_byte};

            new_char = 1'b1;

        end

    end

endtask

//~UART Monitor

`endif // !UART

//~UART

//

//      TASKS to communicate with interfaces

//

//MAC_DATA

//

`ifdef ETHERNET

reg [31:0] crc32_result;

task get_mac;

    integer conta;

    reg LSB;

    begin

        conta = 0;

        LSB = 1;

        @ ( posedge eth_tx_en);

        repeat (16) @ (negedge eth_tx_clk);  //8 bytes, preamble (7 bytes) + start of frame (1 byte)

        while ( eth_tx_en == 1'b1 ) begin

            @ (negedge eth_tx_clk) begin

                if ( LSB == 1'b1 )

                    eth_rx_data[conta][3:0] = eth_txd;

                else begin

                    eth_rx_data[conta][7:4] = eth_txd;

                    conta = conta + 1;

                end

                LSB = ~LSB;

            end

        end

    end

endtask

task send_mac;              //only able to send up to 1536 bytes with header (14 bytes) and CRC (4 bytes)

    input [31:0] length;    //ETH_PAYLOAD_MAX_LENGTH 1518

    integer conta;

    begin

        if ( length <= ETH_PAYLOAD_MAX_LENGTH ) begin

            //DEST MAC

            eth_tx_data[0] = 8'h55;

            eth_tx_data[1] = 8'h47;

            eth_tx_data[2] = 8'h34;

            eth_tx_data[3] = 8'h22;

            eth_tx_data[4] = 8'h88;

            eth_tx_data[5] = 8'h92;

            //SOURCE MAC

            eth_tx_data[6] = 8'h3D;

            eth_tx_data[7] = 8'h4F;

            eth_tx_data[8] = 8'h1A;

            eth_tx_data[9] = 8'hBE;

            eth_tx_data[10] = 8'h68;

            eth_tx_data[11] = 8'h72;

            //LEN

            eth_tx_data[12] = length[7:4];

            eth_tx_data[13] = length[3:0];

            //DATA input by task caller

            //PAD

            for ( conta = length+14; conta < 60; conta = conta + 1 ) begin

                eth_tx_data[conta] = 8'h00;

            end

            gencrc32(conta);

            eth_tx_data[conta] = crc32_result[31:24];

            eth_tx_data[conta+1] = crc32_result[23:16];

            eth_tx_data[conta+2] = crc32_result[15:8];

            eth_tx_data[conta+3] = crc32_result[7:0];

            send_rx_packet( 64'h0055_5555_5555_5555, 4'h7, 8'hD5, 32'h0000_0000, conta+4, 1'b0 );

        end

        else

            $display("Warning: Ethernet packet is to big to be sent.");

    end

endtask

task send_rx_packet;

  input  [(8*8)-1:0] preamble_data; // preamble data to be sent - correct is 64'h0055_5555_5555_5555

  input   [3:0] preamble_len; // length of preamble in bytes - max is 4'h8, correct is 4'h7 

  input   [7:0] sfd_data; // SFD data to be sent - correct is 8'hD5

  input  [31:0] start_addr; // start address

  input  [31:0] len; // length of frame in Bytes (without preamble and SFD)

  input         plus_drible_nibble; // if length is longer for one nibble

  integer       rx_cnt;

  reg    [31:0] eth_tx_data_addr_in; // address for reading from RX memory       

  reg     [7:0] eth_tx_data_data_out; // data for reading from RX memory

begin

      @(posedge eth_rx_clk);

       eth_rx_dv = 1;

      // set initial rx memory address

      eth_tx_data_addr_in = start_addr;

      // send preamble

      for (rx_cnt = 0; (rx_cnt < (preamble_len << 1)) && (rx_cnt < 16); rx_cnt = rx_cnt + 1)

      begin

         eth_rxd = preamble_data[3:0];

         preamble_data = preamble_data >> 4;

        @(posedge eth_rx_clk);

      end

      // send SFD

      for (rx_cnt = 0; rx_cnt < 2; rx_cnt = rx_cnt + 1)

      begin

         eth_rxd = sfd_data[3:0];

         sfd_data = sfd_data >> 4;

        @(posedge eth_rx_clk);

      end

      // send packet's addresses, type/length, data and FCS

      for (rx_cnt = 0; rx_cnt < len; rx_cnt = rx_cnt + 1)

      begin

        eth_tx_data_data_out = eth_tx_data[eth_tx_data_addr_in[21:0]];

        eth_rxd = eth_tx_data_data_out[3:0];

        @(posedge eth_rx_clk);

        eth_rxd = eth_tx_data_data_out[7:4];

        eth_tx_data_addr_in = eth_tx_data_addr_in + 1;

        @(posedge eth_rx_clk);

      end

      if (plus_drible_nibble)

      begin

        eth_tx_data_data_out = eth_tx_data[eth_tx_data_addr_in[21:0]];

        eth_rxd = eth_tx_data_data_out[3:0];

        @(posedge eth_rx_clk);

      end

       eth_rx_dv = 0;

      @(posedge eth_rx_clk);

end

endtask // send_rx_packet

//CRC32

localparam [31:0] CRC32_POLY = 32'h04C11DB7;

task gencrc32;

    input [31:0] crc32_length;

    integer     byte, bit;

    reg         msb;

    reg [7:0]    current_byte;

    reg [31:0]   temp;

    begin

        crc32_result = 32'hffffffff;

        for (byte = 0; byte < crc32_length; byte = byte + 1) begin

            current_byte = eth_tx_data[byte];

            for (bit = 0; bit < 8; bit = bit + 1) begin

                msb = crc32_result[31];

                crc32_result = crc32_result << 1;

                if (msb != current_byte[bit]) begin

                    crc32_result = crc32_result ^ CRC32_POLY;

                    crc32_result[0] = 1;

                end

            end

        end

        // Last step is to "mirror" every bit, swap the 4 bytes, and then complement each bit.

        //

        // Mirror:

        for (bit = 0; bit < 32; bit = bit + 1)

            temp[31-bit] = crc32_result[bit];

        // Swap and Complement:

        crc32_result = ~{temp[7:0], temp[15:8], temp[23:16], temp[31:24]};

    end

endtask

//~CRC32

`endif // !ETHERNET

//~MAC_DATA

//Generate tx and rx clocks

always begin

        #((`ETH_PHY_PERIOD)/2) eth_tx_clk <= ~eth_tx_clk;

end

always begin

        #((`ETH_PHY_PERIOD)/2) eth_rx_clk <= ~eth_rx_clk;

end

//~Generate tx and rx clocks

//

// TASK to initialize instantiated FPGA dual and two port memory to 0

//

task init_fpga_memory;