Subversion Repositories t6507lp

////////////////////////////////////////////////////////////////////////////

////                                                                    ////

//// t2600 IP Core                                                      ////

////                                                                    ////

//// This file is part of the t2600 project                             ////

//// http://www.opencores.org/cores/t2600/                              ////

////                                                                    ////

//// Description                                                        ////

//// Bus controller testbench                                           ////

////                                                                    ////

//// TODO:                                                              ////

//// - Nothing                                                          ////

////                                                                    ////

//// Author(s):                                                         ////

//// - Gabriel Oshiro Zardo, gabrieloshiro@gmail.com                    ////

//// - Samuel Nascimento Pagliarini (creep), snpagliarini@gmail.com     ////

////                                                                    ////

////////////////////////////////////////////////////////////////////////////

////                                                                    ////

//// Copyright (C) 2001 Authors and OPENCORES.ORG                       ////

////                                                                    ////

//// This source file may be used and distributed without               ////

//// restriction provided that this copyright statement is not          ////

//// removed from the file and that any derivative work contains        ////

//// the original copyright notice and the associated disclaimer.       ////

////                                                                    ////

//// This source file 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 source 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 source; if not, download it         ////

//// from http://www.opencores.org/lgpl.shtml                           ////

////                                                                    ////

////////////////////////////////////////////////////////////////////////////

`include "timescale.v"

module t2600_bus_tb();

        parameter [3:0] DATA_SIZE = 4'd8;

        parameter [3:0] ADDR_SIZE = 4'd13;

        localparam [3:0] DATA_SIZE_ = DATA_SIZE - 4'd1;

        localparam [3:0] ADDR_SIZE_ = ADDR_SIZE - 4'd1;

        localparam [3:0] RIOT_ADDR_SIZE_ = 4'd6;

        localparam [3:0] TIA_ADDR_SIZE_ = 4'd5;

        // these 3 registers are kind of drivers/wrappers for the tristate ones

        reg [DATA_SIZE_:0] riot_data_drvr;

        reg [DATA_SIZE_:0] rom_data_drvr;

        reg [DATA_SIZE_:0] tia_data_drvr;

        // list of all the inputs/outputs of the bus controller

        reg [ADDR_SIZE_:0] address;

        reg [DATA_SIZE_:0] data_from_cpu;

        reg cpu_rw_mem;

        tri [DATA_SIZE_:0] riot_data = riot_data_drvr;

        tri [DATA_SIZE_:0] rom_data = rom_data_drvr;

        tri [DATA_SIZE_:0] tia_data = tia_data_drvr;

        wire [RIOT_ADDR_SIZE_:0] address_riot;

        wire [ADDR_SIZE_:0] address_rom;

        wire [TIA_ADDR_SIZE_:0] address_tia;

        wire[DATA_SIZE_:0] data_to_cpu;

        wire enable_riot;

        wire enable_rom;

        wire enable_tia;

        wire rw_mem;

        t2600_bus t2600_bus (

                .address        (address),

                .data_from_cpu  (data_from_cpu),

                .cpu_rw_mem     (cpu_rw_mem),

                .riot_data      (riot_data),

                .rom_data       (rom_data),

                .tia_data       (tia_data),

                .address_riot   (address_riot),

                .address_rom    (address_rom),

                .address_tia    (address_tia),

                .data_to_cpu    (data_to_cpu),

                .enable_riot    (enable_riot),

                .enable_rom     (enable_rom),

                .enable_tia     (enable_tia),

                .rw_mem         (rw_mem)

        );

        always @(*) begin

                if (cpu_rw_mem == 1'b1) begin

                        tia_data_drvr = 8'hZ;

                        riot_data_drvr = 8'hZ;

                        rom_data_drvr = 8'hZ;

                end

        end

        // this block is clockless so I cannot use @(negedge clk)

        initial begin

                address = 13'b0;

                data_from_cpu = 8'h01;

                cpu_rw_mem = 1'b0; // READ

                #10;

                address = 13'd8; // this is a TIA adress

                #10;

                address = 13'd128; // this is a RIOT adress

                #10;

                address = 13'd4096; // this is a ROM adress

                #10;

                cpu_rw_mem = 1'b1; // from now on I will be writing

                riot_data_drvr = 8'h02;

                rom_data_drvr = 8'h03;

                tia_data_drvr = 8'h04;

                address = 13'd8; // this is a TIA adress

                #10;

                address = 13'd128; // this is a RIOT adress

                #10;

                address = 13'd4096; // this is a ROM adress

                #10;

                $finish();

        end

endmodule