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

////                                                              ////

////  File name: pci_rst_int.v                                    ////

////                                                              ////

////  This file is part of the "PCI bridge" project               ////

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

////                                                              ////

////  Author(s):                                                  ////

////      - Tadej Markovic, tadej@opencores.org                   ////

////                                                              ////

////  All additional information is avaliable in the README.txt   ////

////  file.                                                       ////

////                                                              ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2000 Tadej Markovic, tadej@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 $

//

//

`include "pci_constants.v"

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

// Module is used to switch appropriate reset and interrupt signals with few logic

module PCI_RST_INT

(

        clk_in,

        // reset signals

        rst_i,

        pci_rstn_in,

        conf_soft_res_in,

        reset,

        pci_rstn_out,

        pci_rstn_en_out,

        rst_o,

        // interrupt signals

        pci_intan_in,

        conf_int_in,

        int_i,

        out_bckp_perr_en_in,

        out_bckp_serr_en_in,

        pci_intan_out,

        pci_intan_en_out,

        int_o,

        conf_isr_int_prop_out

);

input   clk_in;

// RESET inputs and outputs

input   rst_i;

input   pci_rstn_in;

input   conf_soft_res_in;

output  reset;

output  pci_rstn_out;

output  pci_rstn_en_out;

output  rst_o;

// INTERRUPT inputs and outputs

input   pci_intan_in;

input   conf_int_in;

input   int_i;

input   out_bckp_perr_en_in;

input   out_bckp_serr_en_in;

output  pci_intan_out;

output  pci_intan_en_out;

output  int_o;

output  conf_isr_int_prop_out;

/*--------------------------------------------------------------------------------------------------------

RESET logic

--------------------------------------------------------------------------------------------------------*/

assign pci_rstn_out                     = 1'b0 ;

// host implementation of the bridge gets its reset from WISHBONE bus - RST_I and propagates it to PCI bus

`ifdef HOST

  assign reset                          = rst_i ;

  `ifdef ACTIVE_LOW_OE

  assign pci_rstn_en_out        = ~(rst_i || conf_soft_res_in) ;

  `else

  assign pci_rstn_en_out        = rst_i || conf_soft_res_in ;

  `endif

  assign rst_o                          = 1'b0 ;

`else

// guest implementation of the bridge gets its reset from PCI bus - RST# and propagates it to WISHBONE bus

`ifdef GUEST

  assign reset                          = ~pci_rstn_in ;

  assign rst_o                          = (~pci_rstn_in) || conf_soft_res_in ;

  `ifdef ACTIVE_LOW_OE

  assign pci_rstn_en_out                = 1'b1 ; // disabled

  `else

  assign pci_rstn_en_out                = 1'b0 ; // disabled

  `endif

`endif

`endif

/*--------------------------------------------------------------------------------------------------------

INTERRUPT logic

--------------------------------------------------------------------------------------------------------*/

assign pci_intan_out = 1'b0 ;

// host implementation of the bridge gets its interrupt from PCI bus - INTA# and propagates it to WISHBONE bus

`ifdef HOST

  assign conf_isr_int_prop_out  = ~pci_intan_in ;

  assign int_o                  = conf_int_in ;

  `ifdef ACTIVE_LOW_OE

  assign pci_intan_en_out       = 1'b1 ; // disabled

  `else

  assign pci_intan_en_out       = 1'b0 ; // disabled

  `endif

`else

// guest implementation of the bridge gets its interrupt from WISHBONE bus - INT_I and propagates it to PCI bus

`ifdef GUEST

    wire interrupt_a_en;

    OUT_REG inta

    (

        .reset_in     ( reset ),

        .clk_in       ( clk_in) ,

        .dat_en_in    ( 1'b1 ),

        .en_en_in     ( 1'b1 ),

        .dat_in       ( 1'b0 ) , // active low

        .en_in        ( conf_int_in ) ,

        .en_out       ( interrupt_a_en ),

        .dat_out      ( )

    );

  assign conf_isr_int_prop_out = int_i ;

  assign int_o                 = 1'b0 ;

  assign pci_intan_en_out      = interrupt_a_en ;

`endif

`endif

endmodule