//////////////////////////////////////////////////////////////////////
////                                                              ////
////  8051 program rom                                            ////
////                                                              ////
////  This file is part of the 8051 cores project                 ////
////  http://www.opencores.org/cores/8051/                        ////
////                                                              ////
////  Description                                                 ////
////   program rom                                                ////
////                                                              ////
////  To Do:                                                      ////
////   nothing                                                    ////
////                                                              ////
////  Author(s):                                                  ////
////      - Simon Teran, simont@opencores.org                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// ver: 1
//

// synopsys translate_off
`include "oc8051_timescale.v"
// synopsys translate_on

//`include "oc8051_defines.v"

module ROM32X1(O, A0, A1, A2, A3, A4); // synthesis syn_black_box syn_resources="luts=2"
output O;
input A0;
input A1;
input A2;
input A3;
input A4;
endmodule

//rom for 8051 processor

module oc8051_rom (clk, rst, addr, data1, data2, data3);

input clk, rst;
input [15:0] addr;
output [7:0] data1, data2, data3;

reg [7:0] data1, data2, data3;
reg [4:0] addr01;

wire [15:0] addr_rst;
wire [7:0] int_data0, int_data1, int_data2, int_data3;

assign addr_rst = rst ? 16'h0000 : addr;

  rom0 rom_0 (.a(addr01), .o(int_data0));
  rom1 rom_1 (.a(addr01), .o(int_data1));
  rom2 rom_2 (.a(addr_rst[6:2]), .o(int_data2));
  rom3 rom_3 (.a(addr_rst[6:2]), .o(int_data3));

always @(addr_rst)
begin
  if (addr_rst[1])
    addr01= addr_rst[6:2]+5'b00001;
  else
    addr01= addr_rst[6:2];
end

//
// always read tree bits in row
always @(posedge clk)
begin
  case(addr[1:0])
    2'b00: begin
      data1 <= #1 int_data0;
      data2 <= #1 int_data1;
      data3 <= #1 int_data2;
	end
    2'b01:begin
      data1 <= #1 int_data1;
      data2 <= #1 int_data2;
      data3 <= #1 int_data3;
	end
    2'b10:begin
      data1 <= #1 int_data2;
      data2 <= #1 int_data3;
      data3 <= #1 int_data0;
	end
    2'b11:begin
      data1 <= #1 int_data3;
      data2 <= #1 int_data0;
      data3 <= #1 int_data1;
	end
    default: begin
      data1 <= #1 8'h00;
      data2 <= #1 8'h00;
      data3 <= #1 8'h00;
	end
  endcase
end

endmodule


//rom0
module rom0 (o,a);
input [4:0] a;
output [7:0] o;
ROM32X1 u0 (o[0],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00003810" */;
ROM32X1 u1 (o[1],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=08047212" */;
ROM32X1 u2 (o[2],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=04003e00" */;
ROM32X1 u3 (o[3],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00043412" */;
ROM32X1 u4 (o[4],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=0c023c10" */;
ROM32X1 u5 (o[5],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=0c063f12" */;
ROM32X1 u6 (o[6],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=04063d10" */;
ROM32X1 u7 (o[7],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=000634b2" */;
endmodule

//rom1
module rom1 (o,a);
input [4:0] a;
output [7:0] o;
ROM32X1 u0 (o[0],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=040061c4" */;
ROM32X1 u1 (o[1],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00061100" */;
ROM32X1 u2 (o[2],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00100094" */;
ROM32X1 u3 (o[3],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00027292" */;
ROM32X1 u4 (o[4],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00123256" */;
ROM32X1 u5 (o[5],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00147096" */;
ROM32X1 u6 (o[6],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00107096" */;
ROM32X1 u7 (o[7],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00006880" */;
endmodule

//rom2
module rom2 (o,a);
input [4:0] a;
output [7:0] o;
ROM32X1 u0 (o[0],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02101c53" */;
ROM32X1 u1 (o[1],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00023040" */;
ROM32X1 u2 (o[2],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02005261" */;
ROM32X1 u3 (o[3],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02023360" */;
ROM32X1 u4 (o[4],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02005801" */;
ROM32X1 u5 (o[5],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02023241" */;
ROM32X1 u6 (o[6],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02023201" */;
ROM32X1 u7 (o[7],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00023224" */;
endmodule

//rom3
module rom3 (o,a);
input [4:0] a;
output [7:0] o;
ROM32X1 u0 (o[0],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02100b16" */;
ROM32X1 u1 (o[1],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02200604" */;
ROM32X1 u2 (o[2],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02103416" */;
ROM32X1 u3 (o[3],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=02100846" */;
ROM32X1 u4 (o[4],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00331c33" */;
ROM32X1 u5 (o[5],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=0033381a" */;
ROM32X1 u6 (o[6],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=0013181a" */;
ROM32X1 u7 (o[7],a[0],a[1],a[2],a[3],a[4]) /* synthesis xc_props="INIT=00000061" */;
endmodule