Subversion Repositories t6507lp

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

////                                                                    ////

//// T6507LP IP Core                                                    ////

////                                                                    ////

//// This file is part of the T6507LP project                           ////

//// http://www.opencores.org/cores/t6507lp/                            ////

////                                                                    ////

//// Description                                                        ////

//// 6507 FSM                                                           ////

////                                                                    ////

//// TODO:                                                              ////

//// - Perform simple tests before going into serious verification      ////

////                                                                    ////

//// 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                           ////

////                                                                    ////

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

`timescale 1ns / 1ps

module t6507lp_fsm_tb();

        reg clk;

        reg reset_n;

        reg [7:0] alu_result;

        reg [7:0] alu_status;

        reg [7:0] data_in;

        reg [7:0] alu_x;

        reg [7:0] alu_y;

        wire [12:0] address;

        wire control; // one bit is enough? read = 0, write = 1

        wire [7:0] data_out;

        wire [7:0] alu_opcode;

        wire [7:0] alu_a;

        wire alu_enable;

        `include "../T6507LP_Package.v"

        t6507lp_fsm #(8,13) my_dut(clk, reset_n, alu_result, alu_status, data_in, address, control, data_out, alu_opcode, alu_a, alu_enable, alu_x, alu_y);

        always #10 clk = ~clk;

        reg[7:0] fake_mem[40:0];

        initial begin

                clk = 0;

                reset_n = 1'b0;

                alu_result = 8'h01;

                alu_status = 0;

                alu_x = 8'h07;

                alu_y = 8'h03;

                fake_mem[0] = ASL_ACC; // testing ACC mode

                fake_mem[1] = ADC_IMM; // testing IMM mode

                fake_mem[2] = 8'h27;

                fake_mem[3] = JMP_ABS; // testing ABS mode, JMP type

                fake_mem[4] = 8'h09;

                fake_mem[5] = 8'h00;

                fake_mem[6] = ASL_ACC; // wont be executed

                fake_mem[7] = ASL_ACC; // wont be executed

                fake_mem[8] = ASL_ACC; // wont be executed

                fake_mem[9] = ASL_ACC; // wont be executed

                fake_mem[10] = LDA_ABS; // testing ABS mode, READ type. A = MEM[0002]. (a=27)

                fake_mem[11] = 8'h02;

                fake_mem[12] = 8'h00;

                fake_mem[13] = ASL_ABS; // testing ABS mode, READ_MODIFY_WRITE type. should overwrite the first ASL_ACC

                fake_mem[14] = 8'h00;

                fake_mem[15] = 8'h00;

                fake_mem[16] = STA_ABS; // testing ABS mode, WRITE type. should write alu_result on MEM[1]

                fake_mem[17] = 8'h01;

                fake_mem[18] = 8'h00;

                fake_mem[19] = LDA_ZPG; // testing ZPG mode, READ type

                fake_mem[20] = 8'h00;

                fake_mem[21] = ASL_ZPG; // testing ZPG mode, READ_MODIFY_WRITE type

                fake_mem[22] = 8'h00;

                fake_mem[23] = STA_ZPG; // testing ZPG mode, WRITE type

                fake_mem[24] = 8'h00;

                fake_mem[25] = LDA_ZPX; // testing ZPX mode, READ type. A = MEM[x+1]

                fake_mem[26] = 8'h01;

                fake_mem[27] = ASL_ZPX; // testing ZPX mode, READ_MODIFY_WRITE type. MEM[x+1] = MEM[x+1] << 1;

                fake_mem[28] = 8'h01;

                fake_mem[29] = STA_ZPX; // testing ZPX mode, WRITE type. MEM[x+2] = A;

                fake_mem[30] = 8'h02;

                fake_mem[31] = LDA_ABX; // testing ABX mode, READ TYPE. No page crossed.

                fake_mem[32] = 8'h0a;

                fake_mem[33] = 8'h00;

                @(negedge clk) // will wait for next negative edge of the clock (t=20)

                reset_n=1'b1;

                #2000;

                $finish; // to shut down the simulation

        end //initial

        always @(clk) begin

                if (control == 0) begin // MEM_READ

                        data_in <= fake_mem[address];

                        $write("\nreading from mem position %h: %h", address, fake_mem[address]);

                end

                else if (control == 1'b1) begin // MEM_WRITE

                        fake_mem[address] <= data_out;

                        $write("\nreading from mem position %h: %h", address, fake_mem[address]);

                end

        end

endmodule