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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 1.16  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, clk, int0, int1, ea, iadr_o, idat_i,istb_o, iack_i, dat_i,
		icyc_o, dat_o, adr_o, we_o, ack_i, stb_o, cyc_o, p0_in, p1_in, p2_in, p3_in, p0_out,
		p1_out, p2_out, p3_out, rxd, txd, t0, t1);
//
// rst           (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
// we_o          (out) write to external ram
// stb_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, clk, int0, int1, ea, rxd, t0, t1, ack_i, iack_i;
input [7:0] dat_i, p0_in, p1_in, p2_in, p3_in;
input [31:0] idat_i;
 
output we_o, txd, stb_o, cyc_o, istb_o, icyc_o;
output [7:0] dat_o, p0_out, p1_out, p2_out, p3_out;
//output [15:0] rom_addr, ext_addr;
output [15:0] adr_o, iadr_o;
 
wire [7:0] op1_i, op2_i, op3_i, dptr_hi, dptr_lo, ri, data_out, sp;
wire [7:0] op1, op2, op3;
wire [7:0] acc, p0_out, p1_out, p2_out, p3_out;
 
wire [15:0] pc;
 
//
// data output is always from accumulator
assign dat_o = acc;
 
assign cyc_o = stb_o;
assign icyc_o = istb_o;
 
 
assign op1 = idat_i[31:24];
assign op2 = idat_i[23:16];
assign op3 = idat_i[15:8];
 
//
// ram_rd_sel    ram read (internal)
// ram_wr_sel    ram write (internal)
// src_sel1, src_sel2    from decoder to register
// imm_sel       immediate select
wire [1:0] ram_rd_sel, src_sel1, src_sel2;
wire [2:0] ram_wr_sel, imm_sel;
 
//
// wr_addr       ram write addres
// ram_out       data from ram
// sp            stack pointer output
// rd_addr       data ram read addres
// rd_addr_r     data ram read addres registerd
wire [7:0] wr_addr, ram_data, ram_out, rd_addr, rd_addr_r, sfr_out;
wire sfr_bit;
 
 
//
// src_sel1_r, src_sel2_r       src select, registred
// 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] src_sel1_r, src_sel2_r, cy_sel, cy_sel_r, bank_sel;
wire src_sel3, src_sel3_r, rom_addr_sel, ext_addr_sel, rmw, ea_int, wr_xaddr;
 
//
// 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)
//alu_op_r      alu operation (registerd)
//psw_set       write to psw or not; from decoder to psw (through register)
wire [3:0] alu_op, alu_op_r; wire [1:0] psw_set, psw_set_r;
 
//
// 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, wr_r             write to data ram
wire [7:0] src1, src2, src3, des1, des2, des1_r;
wire desCy, desAc, desOv, alu_cy, wr, wr_r;
wire [7:0] immediate1_r, immediate2_r;
 
 
//
// rd           read program rom
// pc_wr_sel    program counter write select (from decoder to pc)
wire rd, pc_wr;
wire [1:0] 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, op2_dr, op3_n, pc_hi_r;
//wire [2:0] op1_r;
 
//
// comp_sel     select source1 and source2 to compare
// eq           result (from comp1 to decoder)
// wad2, wad2_r write to accumulator from destination 2
wire [1:0] comp_sel;
wire eq, wad2, wad2_r, nop, srcAc, cy, rd_ind, wr_ind;
 
 
//
// 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_r;
 
//
wire pc_wait;
 
 
//
//registers
oc8051_reg8 oc8051_reg8_pc_hi(.clk(clk), .rst(rst), .din(pc[15:8]), .dout(pc_hi_r));
 
oc8051_reg2 oc8051_reg2_src_sel1(.clk(clk), .rst(rst), .din(src_sel1), .dout(src_sel1_r));
oc8051_reg2 oc8051_reg2_src_sel2(.clk(clk), .rst(rst), .din(src_sel2), .dout(src_sel2_r));
oc8051_reg1 oc8051_reg1_sre_sel3(.clk(clk), .rst(rst), .din(src_sel3), .dout(src_sel3_r));
 
oc8051_reg1 oc8051_reg1_wr (.clk(clk), .rst(rst), .din(wr), .dout(wr_r));
 
oc8051_reg4 oc8051_reg4_alu_op(.clk(clk), .rst(rst), .din(alu_op), .dout(alu_op_r));
 
oc8051_reg1 oc8051_reg1_bit_addr(.clk(clk), .rst(rst), .din(bit_addr), .dout(bit_addr_r));
 
oc8051_reg1 oc8051_reg1_wad2(.clk(clk), .rst(rst), .din(wad2), .dout(wad2_r));
oc8051_reg2 oc8051_reg2_cy(.clk(clk), .rst(rst), .din(cy_sel), .dout(cy_sel_r));
oc8051_reg2 oc8051_psw_reg (.clk(clk), .rst(rst), .din(psw_set), .dout(psw_set_r));
oc8051_reg8 oc8051_reg8_rd_ram (.clk(clk), .rst(rst), .din(rd_addr), .dout(rd_addr_r));
 
 
 
 
//
//program counter
oc8051_pc oc8051_pc1(.rst(rst), .clk(clk), .pc_out(pc), .alu({des2,des1}),
       .pc_wr_sel(pc_wr_sel), .op1(op1_n), .op2(op2_n), .op3(op3_n), .wr(pc_wr),
       .rd((pc_wait && !(istb_o && !iack_i))), .intr(intr));
 
//
// decoder
oc8051_decoder oc8051_decoder1(.clk(clk), .rst(rst), .op_in(op1_n),
     .ram_rd_sel(ram_rd_sel), .ram_wr_sel(ram_wr_sel), .bit_addr(bit_addr),
     .src_sel1(src_sel1), .wr_xaddr(wr_xaddr), .src_sel2(src_sel2),
     .src_sel3(src_sel3), .alu_op(alu_op), .psw_set(psw_set),
     .imm_sel(imm_sel), .cy_sel(cy_sel), .wr(wr), .pc_wr(pc_wr),
     .pc_sel(pc_wr_sel), .comp_sel(comp_sel), .eq(eq),
     .rom_addr_sel(rom_addr_sel), .ext_addr_sel(ext_addr_sel),
     .wad2(wad2), .rd(rd), .we_o(we_o), .reti(reti), .rmw(rmw),
     .stb_o(stb_o), .ack_i(ack_i), .istb(istb), .ea(ea && ea_int),
     .iack(iack_i), .pc_wait(pc_wait), .nop(nop));
 
 
 
//
// internal ram address select
oc8051_ram_adr_sel oc8051_ram_rd_sel1 (.rst(rst), .clk(clk), .rd_sel(ram_rd_sel),
            .wr_sel(ram_wr_sel), .sp(sp), .ri(ri), .rn({bank_sel, op1_n[2:0]}), .imm(op2_dr),
	    .imm2(op3_n), .rd_addr(rd_addr), .wr_addr(wr_addr), .rd_ind(rd_ind), .wr_ind(wr_ind));
 
 
 
//
//alu
oc8051_alu oc8051_alu1(.rst(rst), .clk(clk), .op_code(alu_op_r), .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));
 
 
//
//
oc8051_immediate_sel oc8051_immediate_sel1(.clk(clk), .rst(rst), .sel(imm_sel), .op1(op1_n), .op2(op2_n),
          .op3(op3_n), .pch(pc_hi_r), .pcl(pc[7:0]), .out1(immediate1_r), .out2(immediate2_r));
 
//
//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), .wr_data(des1), .wr(wr_r && (!wr_addr[7] || wr_ind)),
	  .bit_data_in(desCy), .bit_data_out(bit_data));
 
//
//
oc8051_alu_src1_sel oc8051_alu_src1_sel1(.sel(src_sel1_r), .immediate(immediate1_r),
		.acc(acc), .ram(ram_out), .ext(dat_i), .des(src1));
oc8051_alu_src2_sel oc8051_alu_src2_sel1(.sel(src_sel2_r), .immediate(immediate2_r),
		.acc(acc), .ram(ram_out), .des(src2));
oc8051_alu_src3_sel oc8051_alu_src3_sel1(.sel(src_sel3_r), .pc(pc_hi_r),
		.dptr(dptr_hi), .des(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_r), .cy_in(cy), .data_in(bit_out),
		 .data_out(alu_cy));
//
//
oc8051_indi_addr oc8051_indi_addr1 (.clk(clk), .rst(rst), .addr(wr_addr),
      .data_in(des1), .wr(wr_r), .wr_bit(bit_addr_r), .data_out(ri),
      .sel(op1_n[0]), .bank(bank_sel));
 
//
//
oc8051_rom_addr_sel oc8051_rom_addr_sel1(.clk(clk), .rst(rst), .iack_i(iack_i),
               .ea(ea && ea_int), .sel(rom_addr_sel), .des1(des1), .des2(des2),
               .pc(pc), .out_addr(iadr_o));
 
//
//
oc8051_ext_addr_sel oc8051_ext_addr_sel1(.clk(clk), .rst(rst), .sel(ext_addr_sel),
		 .dptr_hi(dptr_hi), .dptr_lo(dptr_lo), .ri(ri), .addr_out(adr_o),
		 .wr(wr_xaddr), .stb(stb_o));
//
//
oc8051_ram_sel oc8051_ram_sel1(.addr(rd_addr_r), .bit_in(bit_data), .in_ram(ram_data), .rd_ind(rd_ind),
		.sfr(sfr_out), .sfr_bit(sfr_bit), .bit_out(bit_out), .out_data(ram_out));
 
//
//
oc8051_op_select oc8051_op_select1(.clk(clk), .rst(rst), .ea(ea), .ea_int(ea_int), .op1_i(op1_i),
		.op2_i(op2_i), .op3_i(op3_i), .op1_x(op1), .op2_x(op2), .op3_x(op3),
		.op1_out(op1_n), .op2_out(op2_n), .op2_direct(op2_dr), .op3_out(op3_n),
		.intr(intr), .int_v(int_src), .rd(rd), .ack(int_ack), .istb(istb),
    .istb_o(istb_o), .iack_i(iack_i), .nop(nop));
 
 
oc8051_sfr oc8051_sfr1(.rst(rst), .clk(clk), .adr0(rd_addr), .adr1(wr_addr), .dat0(sfr_out),
       .dat1(des1), .dat2(des2), .we(wr_r && !wr_ind), .bit_in(desCy), .bit_out(sfr_bit), .wr_bit(bit_addr_r),
       .ram_rd_sel(ram_rd_sel), .ram_wr_sel(ram_wr_sel),
// acc
       .wad2(wad2_r), .acc(acc), .rd_x(stb_o && !we_o && ack_i), .xdata(dat_i),
// sp
       .sp(sp),
// psw
       .bank_sel(bank_sel), .desAc(desAc), .desOv(desOv), .psw_set(psw_set_r),
       .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),
// dptr
       .dptr_hi(dptr_hi), .dptr_lo(dptr_lo));
 
endmodule