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

////                                                              ////

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

////                                                              ////

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

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

////                                                              ////

////  Description                                                 ////

////   special function registers for oc8051                      ////

////                                                              ////

////  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 1.5  2003/04/04 10:35:07  simont

// signal prsc_ow added.

//

// Revision 1.4  2003/03/28 17:45:57  simont

// change module name.

//

// Revision 1.3  2003/01/21 13:51:30  simont

// add include oc8051_defines.v

//

// Revision 1.2  2003/01/13 14:14:41  simont

// replace some modules

//

// Revision 1.1  2002/11/05 17:22:27  simont

// initial import

//

//

// synopsys translate_off

`include "oc8051_timescale.v"

// synopsys translate_on

`include "oc8051_defines.v"

module oc8051_sfr (rst, clk, adr0, adr1, dat0, dat1, dat2, we, bit_in, bit_out, wr_bit,

       wr_sfr, acc, ram_wr_sel, ram_rd_sel, sp, sp_w, bank_sel, desAc, desOv, psw_set, srcAc, cy, rmw,

       p0_out, p1_out, p2_out, p3_out, p0_in, p1_in, p2_in, p3_in, rxd, txd, int_ack, intr, int0,

       int1, reti, int_src, t0, t1, dptr_hi, dptr_lo, t2, t2ex);

//

// rst           (in)  reset - pin

// clk           (in)  clock - pin

// adr0, adr1    (in)  address input

// dat0          (out) data output

// dat1          (in)  data input

// dat2

// we            (in)  write enable

// bit_in

// bit_out

// wr_bit

// ram_rd_sel

// ram_wr_sel

// wr_sfr

//////////

//

//  acc:

// acc

//////////

//

//  sp:

// sp

//////////

//

//  psw:

// bank_sel

// desAc

// desOv

// psw_set

// srcAc

// cy

//////////

//

//  ports:

// rmw

// px_out

// px_in

//////////

//

//  serial interface:

// rxd

// txd

//////////

//

//  interrupt interface:

// int_ack

// intr

// int0, int1

// reti

// int_src

//////////

//

//  timers/counters:

// t0

// t1

// t2

// t2ex

//

//////////

//

//  dptr:

// dptr_hi

// dptr_lo

//

//////////

//

input rst, clk, we, bit_in, desAc, desOv, rmw, rxd, t2, t2ex;

input int_ack, int0, int1, reti, wr_bit, t0, t1;

input [1:0] psw_set;

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

input [7:0] adr0, adr1, dat1, dat2, p0_in, p1_in, p2_in, p3_in;

output bit_out, txd, intr, srcAc, cy;

output [1:0] bank_sel;

output [7:0] dat0, p0_out, p1_out, p2_out, p3_out, int_src, dptr_hi, dptr_lo, acc;

output [7:0] sp, sp_w;

reg bit_out;

reg [7:0] dat0, adr0_r;

reg wr_bit_r;

reg [2:0] ram_wr_sel_r;

wire acc_bit, b_bit, psw_bit, port_bit, uart_bit, int_bit, tc2_bit, pca_bit;

wire p, int_uart, tf0, tf1, tr0, tr1;

wire dps, rclk, tclk, brate2, tc2_int;

wire [7:0] b_reg, psw, ports, uart, int_out, tc_out, tc2, sp_out;

wire pres_ow;

assign cy = psw[7];

assign srcAc = psw [6];

//

// accumulator

// ACC

oc8051_acc oc8051_acc1(.clk(clk), .rst(rst), .bit_in(bit_in), .data_in(dat1),

           .data2_in(dat2), .wr(we), .wr_bit(wr_bit_r), .wr_sfr(wr_sfr),

           .wr_addr(adr1), .rd_addr(adr0[2:0]), .data_out(acc), .bit_out(acc_bit), .p(p));

//

// b register

// B

oc8051_b_register oc8051_b_register (.clk(clk), .rst(rst), .bit_in(bit_in), .bit_out(b_bit),

           .data_in(dat1), .wr(we), .wr_bit(wr_bit_r), .wr_addr(adr1), .rd_addr(adr0[2:0]),

           .data_out(b_reg), .wr_sfr(wr_sfr));

//

//stack pointer

// SP

oc8051_sp oc8051_sp1(.clk(clk), .rst(rst), .ram_rd_sel(ram_rd_sel), .ram_wr_sel(ram_wr_sel),

                 .wr_addr(adr1), .wr(we), .wr_bit(wr_bit_r), .data_in(dat1),

                 .data_out(sp_out), .sp_out(sp), .sp_w(sp_w));

//

//data pointer

// DPTR, DPH, DPL

oc8051_dptr oc8051_dptr1(.clk(clk), .rst(rst), .addr(adr1), .data_in(dat1),

                .data2_in(dat2), .wr(we), .wr_bit(wr_bit_r),

                .data_hi(dptr_hi), .data_lo(dptr_lo), .wr_sfr(wr_sfr));

//

//program status word

// PSW

oc8051_psw oc8051_psw1 (.clk(clk), .rst(rst), .wr_addr(adr1), .rd_addr(adr0[2:0]), .data_in(dat1),

                .wr(we), .wr_bit(wr_bit_r), .data_out(psw), .bit_out(psw_bit), .p(p), .cy_in(bit_in),

                .ac_in(desAc), .ov_in(desOv), .set(psw_set), .bank_sel(bank_sel));

//

// ports

// P0, P1, P2, P3

oc8051_ports oc8051_ports1(.clk(clk), .rst(rst), .bit_in(bit_in), .data_in(dat1), .wr(we),

                 .wr_bit(wr_bit_r), .wr_addr(adr1), .rd_addr(adr0), .rmw(rmw),

                 .data_out(ports), .bit_out(port_bit), .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));

//

// serial interface

// SCON, SBUF

oc8051_uart oc8051_uatr1 (.clk(clk), .rst(rst), .bit_in(bit_in), .rd_addr(adr0),

                .data_in(dat1), .wr(we), .wr_bit(wr_bit_r), .wr_addr(adr1),

                .data_out(uart), .bit_out(uart_bit), .rxd(rxd), .txd(txd), .intr(uart_int),

                .rclk(rclk), .tclk(tclk), .brate2(brate2),

                .t1_ow(tf1), .pres_ow(pres_ow));

//

// interrupt control

// IP, IE, TCON

oc8051_int oc8051_int1 (.clk(clk), .rst(rst), .wr_addr(adr1), .rd_addr(adr0), .bit_in(bit_in),

                .ack(int_ack), .data_in(dat1), .data_out(int_out), .bit_out(int_bit),

                .wr(we), .wr_bit(wr_bit_r),

                .tf0(tf0), .tf1(tf1), .t2_int(tc2_int), .tr0(tr0), .tr1(tr1),

                .ie0(int0), .ie1(int1),

                .uart_int(uart_int),

                .reti(reti), .intr(intr), .int_vec(int_src));

//

// timer/counter control

// TH0, TH1, TL0, TH1, TMOD

oc8051_tc oc8051_tc1(.clk(clk), .rst(rst), .wr_addr(adr1), .rd_addr(adr0),

                .data_in(dat1), .wr(we), .wr_bit(wr_bit_r), .ie0(int0), .ie1(int1), .tr0(tr0),

                .tr1(tr1), .t0(t0), .t1(t1), .data_out(tc_out), .tf0(tf0), .tf1(tf1), .pres_ow(pres_ow));

//

// timer/counter 2

// TH2, TH2, RCAPL2L, RCAPL2H, T2CON

oc8051_tc2 oc8051_tc21(.clk(clk), .rst(rst), .wr_addr(adr1), .rd_addr(adr0_r), .data_in(dat1), .wr(we),

           .wr_bit(wr_bit_r), .bit_in(bit_in), .t2(t2), .t2ex(t2ex), .data_out(tc2), .bit_out(tc2_bit),

           .rclk(rclk), .tclk(tclk), .brate2(brate2), .tc2_int(tc2_int), .pres_ow(pres_ow));

always @(posedge clk or posedge rst)

  if (rst) begin

    adr0_r <= #1 8'h00;

    ram_wr_sel_r <= #1 3'b000;

    wr_bit_r <= #1 1'b0;

  end else begin

    adr0_r <= #1 adr0;

    ram_wr_sel_r <= #1 ram_wr_sel;

    wr_bit_r <= #1 wr_bit;

  end

//

//set output in case of address (byte)

always @(adr0_r or psw or acc or dptr_hi or ports or sp_out or b_reg or uart or

         tc_out or tc2 or int_out or dptr_lo)

begin

    case (adr0_r)

      `OC8051_SFR_ACC: dat0 = acc;

      `OC8051_SFR_PSW: dat0 = psw;

      `OC8051_SFR_P0: dat0 = ports;

      `OC8051_SFR_P1: dat0 = ports;

      `OC8051_SFR_P2: dat0 = ports;

      `OC8051_SFR_P3: dat0 = ports;

      `OC8051_SFR_SP: dat0 = sp_out;

      `OC8051_SFR_B: dat0 = b_reg;

      `OC8051_SFR_DPTR_HI: dat0 = dptr_hi;

      `OC8051_SFR_DPTR_LO: dat0 = dptr_lo;

      `OC8051_SFR_SCON: dat0 = uart;

      `OC8051_SFR_SBUF: dat0 = uart;

      `OC8051_SFR_PCON: dat0 = uart;

      `OC8051_SFR_TH0: dat0 = tc_out;

      `OC8051_SFR_TH1: dat0 = tc_out;

      `OC8051_SFR_TL0: dat0 = tc_out;

      `OC8051_SFR_TL1: dat0 = tc_out;

      `OC8051_SFR_TMOD: dat0 = tc_out;

      `OC8051_SFR_IP: dat0 = int_out;

      `OC8051_SFR_IE: dat0 = int_out;

      `OC8051_SFR_TCON: dat0 = int_out;

      `OC8051_SFR_RCAP2H: dat0 = tc2;

      `OC8051_SFR_RCAP2L: dat0 = tc2;

      `OC8051_SFR_TH2:    dat0 = tc2;

      `OC8051_SFR_TL2:    dat0 = tc2;

      `OC8051_SFR_T2CON:  dat0 = tc2;

      default: dat0 = 8'h00;

    endcase

end

//

//set output in case of address (bit)

always @(adr0_r or b_bit or acc_bit or psw_bit or int_bit or port_bit or uart_bit or tc2_bit)

begin

    case (adr0_r[7:3])

      `OC8051_SFR_B_ACC: bit_out = acc_bit;

      `OC8051_SFR_B_PSW: bit_out = psw_bit;

      `OC8051_SFR_B_P0: bit_out = port_bit;

      `OC8051_SFR_B_P1: bit_out = port_bit;

      `OC8051_SFR_B_P2: bit_out = port_bit;

      `OC8051_SFR_B_P3: bit_out = port_bit;

      `OC8051_SFR_B_B: bit_out = b_bit;

      `OC8051_SFR_B_IP: bit_out = int_bit;

      `OC8051_SFR_B_IE: bit_out = int_bit;

      `OC8051_SFR_B_TCON: bit_out = int_bit;

      `OC8051_SFR_B_SCON: bit_out = uart_bit;

      `OC8051_SFR_B_T2CON: bit_out = tc2_bit;

      default: bit_out = 1'b0;

    endcase

end

endmodule