Subversion Repositories ha1588

/*

 * gmii_tx_bfm.v

 *

 * Copyright (c) 2012, BABY&HW. All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA 02110-1301  USA

 */

`timescale 1ns/1ns

module gmii_tx_bfm

  (

    output           gmii_txclk,

    output reg       gmii_txctrl,

    output reg [7:0] gmii_txdata

  );

reg gmii_txclk_offset;

initial begin

               gmii_txclk_offset = 1'b0;

    forever #4 gmii_txclk_offset = !gmii_txclk_offset;

end

assign #2 gmii_txclk = gmii_txclk_offset;

integer feeder_file_tx, r_tx, s_tx;

integer start_addr_tx, end_addr_tx;

integer index_tx, num_tx;

reg eof_tx;

reg pcap_endian_tx;

reg [31:0] pcap_4bytes_tx;

reg [31:0] packet_leng_tx;

reg [ 7:0] packet_byte_tx;

initial

begin : feeder_tx

    gmii_txctrl   = 1'b0;

    gmii_txdata = 4'd0;

    #100;

    feeder_file_tx = $fopen("ptpdv2_tx.pcap","rb");

    if (feeder_file_tx == 0)

    begin

        $display("Failed to open ptpdv2_tx.pcap!");

        disable feeder_tx;

    end

    else

    begin

        // test pcap file endian

        r_tx = $fread(pcap_4bytes_tx, feeder_file_tx);

        pcap_endian_tx = (pcap_4bytes_tx == 32'ha1b2c3d4)? 1:0;

        s_tx = $fseek(feeder_file_tx, -4, 1);

        // skip pcap file header 24*8

        s_tx = $fseek(feeder_file_tx, 24, 1);

        // read packet content

        eof_tx = 0;

        num_tx = 0;

        while (!eof_tx & !$feof(feeder_file_tx))

        begin : fileread_loop

            // skip frame header (8+4)*8

            start_addr_tx = $ftell(feeder_file_tx);

            s_tx = $fseek(feeder_file_tx, 8+4, 1);

            // get frame length big endian 4*8

            r_tx = $fread(packet_leng_tx, feeder_file_tx);

            packet_leng_tx = pcap_endian_tx?

                               {packet_leng_tx[31:24], packet_leng_tx[23:16], packet_leng_tx[15: 8], packet_leng_tx[ 7: 0]}:

                               {packet_leng_tx[ 7: 0], packet_leng_tx[15: 8], packet_leng_tx[23:16], packet_leng_tx[31:24]};

            // check whether end of file

            if (r_tx == 0)

            begin

                eof_tx = 1;

                @(posedge gmii_txclk_offset);

                gmii_txctrl = 1'b0;

                gmii_txdata = 8'h00;

                disable fileread_loop;

            end

            // send ifg 96bit=12*8

            repeat (12)

            begin

                @(posedge gmii_txclk_offset)

                gmii_txctrl = 1'b0;

                gmii_txdata = 8'h00;

            end

            // send frame preamble and sfd 5555555d=4*8

            repeat (3)

            begin

                @(posedge gmii_txclk_offset);

                gmii_txctrl = 1'b1;

                gmii_txdata = 8'h55;

            end

                @(posedge gmii_txclk_offset)

                gmii_txctrl = 1'b1;

                gmii_txdata = 8'h5d;

            // send frame content

            for (index_tx=0; index_tx<packet_leng_tx; index_tx=index_tx+1)

            begin

                r_tx = $fread(packet_byte_tx, feeder_file_tx);

                @(posedge gmii_txclk_offset);

                gmii_txctrl = 1'b1;

                gmii_txdata = packet_byte_tx;

                // check whether end of file

                if (r_tx == 0)

                begin

                    eof_tx = 1;

                    @(posedge gmii_txclk_offset);

                    gmii_txctrl = 1'b0;

                    gmii_txdata = 8'h00;

                    disable fileread_loop;

                end

            end

            end_addr_tx = $ftell(feeder_file_tx);

            num_tx = num_tx + 1;

        end

        $fclose(feeder_file_tx);

        gmii_txctrl = 1'b0;

        gmii_txdata = 8'h00;

    end

end

endmodule