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/*

 * $ptp_drv_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 ptp_drv_bfm_sv

(

        input         up_clk,

        output        up_wr,

        output        up_rd,

        output [ 7:0] up_addr,

        output [31:0] up_data_wr,

        input  [31:0] up_data_rd

);

import "DPI-C" context task ptp_drv_bfm_c

(

        input real fw_delay

);

reg  [ 7:0] up_addr_o;

reg  [31:0] up_data_o;

wire [31:0] up_data_i;

reg         up_wr_o;

reg         up_rd_o;

export "DPI-C" task cpu_wr;

task cpu_wr(input int addr, input int data);

        integer i;

        //$display("wr %08x %08x", addr, data);

        for (i=0; i<1; i=i+1) @(posedge up_clk);

        up_addr_o = addr;

        up_data_o = data;

        up_wr_o   = 1'b1;

        for (i=0; i<1; i=i+1) @(posedge up_clk);

        up_addr_o = addr;

        up_data_o = data;

        up_wr_o   = 1'b0;

        for (i=0; i<1; i=i+1) @(posedge up_clk);

endtask

export "DPI-C" task cpu_rd;

task cpu_rd(input int addr, output int data);

        integer i;

        for (i=0; i<2; i=i+1) @(posedge up_clk);

        up_addr_o = addr;

        up_rd_o   = 1'b1;

        for (i=0; i<1; i=i+1) @(posedge up_clk);

        up_addr_o = addr;

        up_rd_o   = 1'b0;

        for (i=0; i<2; i=i+1) @(posedge up_clk);

        data      = up_data_rd;

        //$display("rd %08x %08x", addr, data);

endtask

export "DPI-C" task cpu_hd;

task cpu_hd(input int t);

        integer i;

        //$display("#%d",t);

        for (i=0; i<=t; i=i+1) @(posedge up_clk);

endtask

assign up_wr      = up_wr_o;

assign up_rd      = up_rd_o;

assign up_addr    = up_addr_o;

assign up_data_wr = up_data_o;

assign up_data_i  = up_data_rd;

// start cpu bfm C model

reg up_start;

initial begin

        up_wr_o   = 1'b0;

        up_rd_o   = 1'b0;

        up_addr_o = 'd0;

        up_data_o = 'd0;

        @(posedge up_start);

        #100 ptp_drv_bfm_c(5);

end

endmodule