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

////                                                              ////

////  8051 cores top level module                                 ////

////                                                              ////

////  This file is part of the 8051 cores project                 ////

////  http://www.opencores.org/cores/8051/                        ////

////                                                              ////

////  Description                                                 ////

////  8051 definitions.                                           ////

////                                                              ////

////  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                     ////

////                                                              ////

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

//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// Revision 1.17  2002/11/05 17:23:54  simont

// add module oc8051_sfr, 256 bytes internal ram

//

// Revision 1.16  2002/10/28 14:55:00  simont

// fix bug in interface to external data ram

//

// Revision 1.15  2002/10/23 16:53:39  simont

// fix bugs in instruction interface

//

// Revision 1.14  2002/10/17 18:50:00  simont

// cahnge interface to instruction rom

//

// Revision 1.13  2002/09/30 17:33:59  simont

// prepared header

//

//

// synopsys translate_off

`include "oc8051_timescale.v"

// synopsys translate_on

module oc8051_top (rst_i, clk, int0, int1, ea, iadr_o, idat_i,istb_o, iack_i, ddat_i,

                icyc_o, ddat_o, dadr_o, dwe_o, dack_i, dstb_o, dcyc_o, p0_in, p1_in, p2_in, p3_in, p0_out,

                p1_out, p2_out, p3_out, rxd, txd, t0, t1, t2, t2ex);

//

// rst_i         (in)  reset - pin

// clk           (in)  clock - pin

// iadr_o        (out) program rom addres (pin + internal)

// int0          (in)  external interrupt 0

// int1          (in)  external interrupt 1

// dat_i         (in)  exteranal ram input

// dat_o         (out) exteranal ram output

// adr_o         (out) external address

// dwe_o         (out) write to external ram

// dstb_o

// ack_i

// idat_i        (in)  data from external program rom

// istb_o        (out) strobe to program rom

// iack_i        (in)  acknowlage from external rom

// icyc_o        (out)

// p0_in, p1_in, p2_in, p3_in           (in)  port inputs

// p0_out, p1_out, p2_out, p3_out       (out) port outputs

// rxd           (in) receive

// txd           (out) transmit

// t0, t1        (in)  t/c external inputs

//

//

input rst_i, clk, int0, int1, ea, rxd, t0, t1, dack_i, iack_i, t2, t2ex;

input [7:0] ddat_i, p0_in, p1_in, p2_in, p3_in;

input [31:0] idat_i;

output dwe_o, txd, dstb_o, dcyc_o, istb_o, icyc_o;

output [7:0] ddat_o, p0_out, p1_out, p2_out, p3_out;

output [15:0] dadr_o, iadr_o;

wire [7:0] op1_i, op2_i, op3_i, dptr_hi, dptr_lo, ri, rn_mem, data_out;

wire [7:0] op1, op2, op3;

wire [7:0] acc, p0_out, p1_out, p2_out, p3_out;

wire [7:0] sp, sp_w;

wire [15:0] pc;

wire rst;

assign rst = rst_i;

assign dcyc_o = dstb_o;

assign icyc_o = istb_o;

//

// ram_rd_sel    ram read (internal)

// ram_wr_sel    ram write (internal)

// src_sel1, src_sel2    from decoder to register

wire src_sel3;

wire [2:0] ram_rd_sel, ram_wr_sel, wr_sfr;

wire [2:0] src_sel2, src_sel1;

//

// wr_addr       ram write addres

// ram_out       data from ram

// rd_addr       data ram read addres

// rd_addr_r     data ram read addres registerd

wire [7:0] ram_data, ram_out, sfr_out, wr_dat;

wire [7:0] wr_addr, rd_addr;

wire sfr_bit;

//

// cy_sel       carry select; from decoder to cy_selct1

// rom_addr_sel rom addres select; alu or pc

// ext_adddr_sel        external addres select; data pointer or Ri

// write_p      output from decoder; write to external ram, go to register;

wire [1:0] cy_sel, bank_sel;

wire rom_addr_sel, rmw, ea_int;

//

// int_uart     interrupt from uart

// tf0          interrupt from t/c 0

// tf1          interrupt from t/c 1

// tr0          timer 0 run

// tr1          timer 1 run

wire reti, intr, int_ack, istb;

wire [7:0] int_src;

//

//alu_op        alu operation (from decoder)

//psw_set       write to psw or not; from decoder to psw (through register)

wire mem_wait;

wire [2:0] mem_act;

wire [3:0] alu_op;

wire [1:0] psw_set;

//

// immediate1_r         from imediate_sel1 to alu_src1_sel1

// immediate2_r         from imediate_sel1 to alu_src2_sel1

// src1. src2, src2     alu sources

// des2, des2           alu destinations

// des1_r               destination 1 registerd (to comp1)

// desCy                carry out

// desAc

// desOv                overflow

// wr                   write to data ram

wire [7:0] src1, src2, des1, des2, des1_r;

wire [7:0] src3;

wire desCy, desAc, desOv, alu_cy, wr, wr_o;

//

// rd           read program rom

// pc_wr_sel    program counter write select (from decoder to pc)

wire rd, pc_wr;

wire [2:0] pc_wr_sel;

//

// op1_n                from op_select to decoder

// op2_n,         output of op_select, to immediate_sel1, pc1, comp1

// op3_n,         output of op_select, to immediate_sel1, ram_wr_sel1

// op2_dr,      output of op_select, to ram_rd_sel1, ram_wr_sel1

wire [7:0] op1_n, op2_n, op3_n;

//

// comp_sel     select source1 and source2 to compare

// eq           result (from comp1 to decoder)

wire [1:0] comp_sel;

wire eq, srcAc, cy, rd_ind, wr_ind;

wire [2:0] op1_cur;

//

// bit_addr     bit addresable instruction

// bit_data     bit data from ram to ram_select

// bit_out      bit data from ram_select to alu and cy_select

wire bit_addr, bit_data, bit_out, bit_addr_o;

//

//

// decoder

oc8051_decoder oc8051_decoder1(.clk(clk), .rst(rst), .op_in(op1_n), .op1_c(op1_cur),

     .ram_rd_sel(ram_rd_sel), .ram_wr_sel(ram_wr_sel), .bit_addr(bit_addr),

     .src_sel1(src_sel1), .src_sel2(src_sel2),

     .src_sel3(src_sel3), .alu_op(alu_op), .psw_set(psw_set),

     .cy_sel(cy_sel), .wr(wr), .pc_wr(pc_wr),

     .pc_sel(pc_wr_sel), .comp_sel(comp_sel), .eq(eq),

     .wr_sfr(wr_sfr), .rd(rd), .rmw(rmw),

     .istb(istb), .mem_act(mem_act), .mem_wait(mem_wait));

//

//alu

oc8051_alu oc8051_alu1(.rst(rst), .clk(clk), .op_code(alu_op), .rd(rd),

     .src1(src1), .src2(src2), .src3(src3), .srcCy(alu_cy), .srcAc(srcAc),

     .des1(des1), .des2(des2), .des1_r(des1_r), .desCy(desCy),

     .desAc(desAc), .desOv(desOv), .bit_in(bit_out));

//

//data ram

oc8051_ram_top oc8051_ram_top1(.clk(clk), .rst(rst), .rd_addr(rd_addr), .rd_data(ram_data),

          .wr_addr(wr_addr), .bit_addr(bit_addr_o), .wr_data(wr_dat), .wr(wr_o && (!wr_addr[7] || wr_ind)),

          .bit_data_in(desCy), .bit_data_out(bit_data));

//

oc8051_alu_src_sel oc8051_alu_src_sel1(.clk(clk), .rst(rst), .rd(rd),

     .sel1(src_sel1), .sel2(src_sel2), .sel3(src_sel3),

     .acc(acc), .ram(ram_out), .pc(pc), .dptr({dptr_hi, dptr_lo}),

     .op1(op1_n), .op2(op2_n), .op3(op3_n),

     .src1(src1), .src2(src2), .src3(src3));

//

//

oc8051_comp oc8051_comp1(.sel(comp_sel), .eq(eq), .b_in(bit_out), .cy(cy), .acc(acc), .des(des1_r));

//

//program rom

oc8051_rom oc8051_rom1(.rst(rst), .clk(clk), .ea_int(ea_int), .addr(iadr_o),

                .data1(op1_i), .data2(op2_i), .data3(op3_i));

//

//

oc8051_cy_select oc8051_cy_select1(.cy_sel(cy_sel), .cy_in(cy), .data_in(bit_out),

                 .data_out(alu_cy));

//

//

oc8051_indi_addr oc8051_indi_addr1 (.clk(clk), .rst(rst), .rd_addr(rd_addr), .wr_addr(wr_addr),

      .data_in(wr_dat), .wr(wr_o), .wr_bit(bit_addr_o), .rn_out(rn_mem),

      .ri_out(ri), .sel(op1_cur), .bank(bank_sel));

//

//

oc8051_memory_interface oc8051_memory_interface1(.clk(clk), .rst(rst),

   .wr_i(wr), .wr_o(wr_o), .wr_bit_i(bit_addr), .wr_bit_o(bit_addr_o), .wr_dat(wr_dat),

//rom_addr_sel

   .iack_i(iack_i), .des1(des1), .des2(des2),

   .iadr_o(iadr_o), .sp_w(sp_w),

//ext_addr_sel

   .dptr({dptr_hi, dptr_lo}), .ri(ri), .rn_mem(rn_mem), .dadr_o(dadr_o), .ddat_o(ddat_o),

   .dwe_o(dwe_o), .dstb_o(dstb_o), .ddat_i(ddat_i), .acc(acc), .dack_i(dack_i),

//ram_addr_sel

   .rd_sel(ram_rd_sel), .wr_sel(ram_wr_sel), .sp(sp), .rn({bank_sel, op1_n[2:0]}),

   .rd_addr(rd_addr), .wr_addr(wr_addr), .rd_ind(rd_ind), .wr_ind(wr_ind),

//op_select

   .ea(ea), .ea_int(ea_int),

   .op1_i(op1_i), .op2_i(op2_i), .op3_i(op3_i),

   .idat_i(idat_i),

   .op1_out(op1_n), .op2_out(op2_n), .op3_out(op3_n),

   .intr(intr), .int_v(int_src), .rd(rd), .int_ack(int_ack), .istb(istb),

   .istb_o(istb_o),

//pc

   .pc_wr_sel(pc_wr_sel), .pc_wr(pc_wr), .pc(pc),

   .mem_act(mem_act), .mem_wait(mem_wait),

   .bit_in(bit_data), .in_ram(ram_data),

   .sfr(sfr_out), .sfr_bit(sfr_bit), .bit_out(bit_out), .iram_out(ram_out),

   .reti(reti));

//

//

oc8051_sfr oc8051_sfr1(.rst(rst), .clk(clk), .adr0(rd_addr[7:0]), .adr1(wr_addr[7:0]),

       .dat0(sfr_out), .dat1(wr_dat), .dat2(des2), .we(wr_o && !wr_ind), .bit_in(desCy),

       .bit_out(sfr_bit), .wr_bit(bit_addr_o), .ram_rd_sel(ram_rd_sel), .ram_wr_sel(ram_wr_sel), .wr_sfr(wr_sfr),

// acc

       .acc(acc),

// sp

       .sp(sp), .sp_w(sp_w),

// psw

       .bank_sel(bank_sel), .desAc(desAc), .desOv(desOv), .psw_set(psw_set),

       .srcAc(srcAc), .cy(cy),

// ports

       .rmw(rmw), .p0_out(p0_out), .p1_out(p1_out), .p2_out(p2_out), .p3_out(p3_out),

       .p0_in(p0_in), .p1_in(p1_in), .p2_in(p2_in), .p3_in(p3_in),

// uart

       .rxd(rxd), .txd(txd),

// int

       .int_ack(int_ack), .intr(intr), .int0(int0), .int1(int1), .reti(reti), .int_src(int_src),

// t/c

       .t0(t0), .t1(t1), .t2(t2), .t2ex(t2ex),

// dptr

       .dptr_hi(dptr_hi), .dptr_lo(dptr_lo));

endmodule