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

////                                                              ////

////  File name "pci_bridge32.v"                                  ////

////                                                              ////

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

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

////                                                              ////

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

////      - Miha Dolenc (mihad@opencores.org)                     ////

////      - Tadej Markovic (tadej@opencores.org)                  ////

////                                                              ////

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

////  file.                                                       ////

////                                                              ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2001 Miha Dolenc, mihad@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 1.18  2004/08/19 15:27:34  mihad

// Changed minimum pci image size to 256 bytes because

// of some PC system problems with size of IO images.

//

// Revision 1.17  2004/01/24 11:54:18  mihad

// Update! SPOCI Implemented!

//

// Revision 1.16  2003/12/19 11:11:30  mihad

// Compact PCI Hot Swap support added.

// New testcases added.

// Specification updated.

// Test application changed to support WB B3 cycles.

//

// Revision 1.15  2003/12/10 12:02:54  mihad

// The wbs B3 to B2 translation logic had wrong reset wire connected!

//

// Revision 1.14  2003/12/09 09:33:57  simons

// Some warning cleanup.

//

// Revision 1.13  2003/10/17 09:11:52  markom

// mbist signals updated according to newest convention

//

// Revision 1.12  2003/08/21 20:49:03  tadejm

// Added signals for WB Master B3.

//

// Revision 1.11  2003/08/08 16:36:33  tadejm

// Added 'three_left_out' to pci_pciw_fifo signaling three locations before full. Added comparison between current registered cbe and next unregistered cbe to signal wb_master whether it is allowed to performe burst or not. Due to this, I needed 'three_left_out' so that writing to pci_pciw_fifo can be registered, otherwise timing problems would occure.

//

// Revision 1.10  2003/08/03 18:05:06  mihad

// Added limited WISHBONE B3 support for WISHBONE Slave Unit.

// Doesn't support full speed bursts yet.

//

// Revision 1.9  2003/01/27 16:49:31  mihad

// Changed module and file names. Updated scripts accordingly. FIFO synchronizations changed.

//

// Revision 1.8  2002/10/21 13:04:33  mihad

// Changed BIST signal names etc..

//

// Revision 1.7  2002/10/18 03:36:37  tadejm

// Changed wrong signal name mbist_sen into mbist_ctrl_i.

//

// Revision 1.6  2002/10/17 22:51:50  tadejm

// Changed BIST signals for RAMs.

//

// Revision 1.5  2002/10/11 10:09:01  mihad

// Added additional testcase and changed rst name in BIST to trst

//

// Revision 1.4  2002/10/08 17:17:05  mihad

// Added BIST signals for RAMs.

//

// Revision 1.3  2002/02/01 15:25:12  mihad

// Repaired a few bugs, updated specification, added test bench files and design document

//

// Revision 1.2  2001/10/05 08:14:28  mihad

// Updated all files with inclusion of timescale file for simulation purposes.

//

// Revision 1.1.1.1  2001/10/02 15:33:46  mihad

// New project directory structure

//

//

`include "pci_constants.v"

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

// this is top level module of pci bridge core

// it instantiates and connects other lower level modules

// check polarity of PCI output enables in file out_reg.v and change it according to IO interface specification

module pci_bridge32

(

    // WISHBONE system signals

    wb_clk_i,

    wb_rst_i,

    wb_rst_o,

    wb_int_i,

    wb_int_o,

    // WISHBONE slave interface

    wbs_adr_i,

    wbs_dat_i,

    wbs_dat_o,

    wbs_sel_i,

    wbs_cyc_i,

    wbs_stb_i,

    wbs_we_i,

`ifdef PCI_WB_REV_B3

    wbs_cti_i,

    wbs_bte_i,

`else

    wbs_cab_i,

`endif

    wbs_ack_o,

    wbs_rty_o,

    wbs_err_o,

    // WISHBONE master interface

    wbm_adr_o,

    wbm_dat_i,

    wbm_dat_o,

    wbm_sel_o,

    wbm_cyc_o,

    wbm_stb_o,

    wbm_we_o,

    wbm_cti_o,

    wbm_bte_o,

    wbm_ack_i,

    wbm_rty_i,

    wbm_err_i,

    // pci interface - system pins

    pci_clk_i,

    pci_rst_i,

    pci_rst_o,

    pci_inta_i,

    pci_inta_o,

    pci_rst_oe_o,

    pci_inta_oe_o,

    // arbitration pins

    pci_req_o,

    pci_req_oe_o,

    pci_gnt_i,

    // protocol pins

    pci_frame_i,

    pci_frame_o,

    pci_frame_oe_o,

    pci_irdy_oe_o,

    pci_devsel_oe_o,

    pci_trdy_oe_o,

    pci_stop_oe_o,

    pci_ad_oe_o,

    pci_cbe_oe_o,

    pci_irdy_i,

    pci_irdy_o,

    pci_idsel_i,

    pci_devsel_i,

    pci_devsel_o,

    pci_trdy_i,

    pci_trdy_o,

    pci_stop_i,

    pci_stop_o          ,

    // data transfer pins

    pci_ad_i,

    pci_ad_o,

    pci_cbe_i,

    pci_cbe_o,

    // parity generation and checking pins

    pci_par_i,

    pci_par_o,

    pci_par_oe_o,

    pci_perr_i,

    pci_perr_o,

    pci_perr_oe_o,

    // system error pin

    pci_serr_o,

    pci_serr_oe_o

`ifdef PCI_BIST

    ,

    // debug chain signals

    mbist_si_i,       // bist scan serial in

    mbist_so_o,       // bist scan serial out

    mbist_ctrl_i        // bist chain shift control

`endif

`ifdef PCI_CPCI_HS_IMPLEMENT

    ,

    // Compact PCI Hot Swap signals

    pci_cpci_hs_enum_o      ,   //  ENUM# output with output enable (open drain)

    pci_cpci_hs_enum_oe_o   ,   //  ENUM# enum output enable

    pci_cpci_hs_led_o       ,   //  LED output with output enable (open drain)

    pci_cpci_hs_led_oe_o    ,   //  LED output enable

    pci_cpci_hs_es_i            //  ejector switch state indicator input

`endif

`ifdef PCI_SPOCI

    ,

    // Serial power on configuration interface

    spoci_scl_o     ,

    spoci_scl_oe_o  ,

    spoci_sda_i     ,

    spoci_sda_o     ,

    spoci_sda_oe_o

`endif

);

`ifdef HOST

    `ifdef NO_CNF_IMAGE

        parameter pci_ba0_width = `PCI_NUM_OF_DEC_ADDR_LINES ;

    `else

        parameter pci_ba0_width = 20    ;

    `endif

`endif

`ifdef GUEST

    parameter pci_ba0_width = 20 ;

`endif

parameter pci_ba1_5_width = `PCI_NUM_OF_DEC_ADDR_LINES ;

// WISHBONE system signals

input   wb_clk_i ;

input   wb_rst_i ;

output  wb_rst_o ;

input   wb_int_i ;

output  wb_int_o ;

// WISHBONE slave interface

input   [31:0]  wbs_adr_i ;

input   [31:0]  wbs_dat_i ;

output  [31:0]  wbs_dat_o ;

input   [3:0]   wbs_sel_i ;

input           wbs_cyc_i ;

input           wbs_stb_i ;

input           wbs_we_i ;

`ifdef PCI_WB_REV_B3

input [2:0] wbs_cti_i ;

input [1:0] wbs_bte_i ;

`else

input wbs_cab_i ;

`endif

output          wbs_ack_o ;

output          wbs_rty_o ;

output          wbs_err_o ;

// WISHBONE master interface

output  [31:0]  wbm_adr_o ;

input   [31:0]  wbm_dat_i ;

output  [31:0]  wbm_dat_o ;

output  [3:0]   wbm_sel_o ;

output          wbm_cyc_o ;

output          wbm_stb_o ;

output          wbm_we_o ;

output  [2:0]   wbm_cti_o ;

output  [1:0]   wbm_bte_o ;

input           wbm_ack_i ;

input           wbm_rty_i ;

input           wbm_err_i ;

// pci interface - system pins

input   pci_clk_i ;

input   pci_rst_i ;

output  pci_rst_o ;

output  pci_rst_oe_o ;

input   pci_inta_i ;

output  pci_inta_o ;

output  pci_inta_oe_o ;

// arbitration pins

output  pci_req_o ;

output  pci_req_oe_o ;

input   pci_gnt_i ;

// protocol pins

input   pci_frame_i ;

output  pci_frame_o ;

output  pci_frame_oe_o ;

output  pci_irdy_oe_o ;

output  pci_devsel_oe_o ;

output  pci_trdy_oe_o ;

output  pci_stop_oe_o ;

output  [31:0] pci_ad_oe_o ;

output  [3:0]  pci_cbe_oe_o ;

input   pci_irdy_i ;

output  pci_irdy_o ;

input   pci_idsel_i ;

input   pci_devsel_i ;

output  pci_devsel_o ;

input   pci_trdy_i ;

output  pci_trdy_o ;

input   pci_stop_i ;

output  pci_stop_o ;

// data transfer pins

input   [31:0]  pci_ad_i ;

output  [31:0]  pci_ad_o ;

input   [3:0]   pci_cbe_i ;

output  [3:0]   pci_cbe_o ;

// parity generation and checking pins

input   pci_par_i ;

output  pci_par_o ;

output  pci_par_oe_o ;

input   pci_perr_i ;

output  pci_perr_o ;

output  pci_perr_oe_o ;

// system error pin

output  pci_serr_o ;

output  pci_serr_oe_o ;

`ifdef PCI_BIST

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

BIST debug chain port signals

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

input   mbist_si_i;       // bist scan serial in

output  mbist_so_o;       // bist scan serial out

input [`PCI_MBIST_CTRL_WIDTH - 1:0] mbist_ctrl_i;       // bist chain shift control

`endif

`ifdef PCI_CPCI_HS_IMPLEMENT

    // Compact PCI Hot Swap signals

output  pci_cpci_hs_enum_o      ;   //  ENUM# output with output enable (open drain)

output  pci_cpci_hs_enum_oe_o   ;   //  ENUM# enum output enable

output  pci_cpci_hs_led_o       ;   //  LED output with output enable (open drain)

output  pci_cpci_hs_led_oe_o    ;   //  LED output enable

input   pci_cpci_hs_es_i        ;   //  ejector switch state indicator input

assign  pci_cpci_hs_enum_o = 1'b0   ;

assign  pci_cpci_hs_led_o  = 1'b0   ;

`endif

`ifdef PCI_SPOCI

output  spoci_scl_o     ;

output  spoci_scl_oe_o  ;

input   spoci_sda_i     ;

output  spoci_sda_o     ;

output  spoci_sda_oe_o  ;

assign  spoci_scl_o = 1'b0  ;

assign  spoci_sda_o = 1'b0  ;

`endif

// declare clock and reset wires

wire pci_clk = pci_clk_i ;

wire wb_clk  = wb_clk_i ;

wire reset ; // assigned at pci bridge reset and interrupt logic

/*=========================================================================================================

First comes definition of all modules' outputs, so they can be assigned to any other module's input later

  in the file, when module is instantiated

=========================================================================================================*/

// PCI BRIDGE RESET AND INTERRUPT LOGIC OUTPUTS

wire    pci_reso_reset ;

wire    pci_reso_pci_rstn_out ;

wire    pci_reso_pci_rstn_en_out ;

wire    pci_reso_rst_o ;

wire    pci_into_pci_intan_out ;

wire    pci_into_pci_intan_en_out ;

wire    pci_into_int_o ;

wire    pci_into_conf_isr_int_prop_out ;

// assign pci bridge reset interrupt logic outputs to top outputs where possible

assign reset            = pci_reso_reset ;

assign pci_rst_o     = pci_reso_pci_rstn_out ;

assign pci_rst_oe_o  = pci_reso_pci_rstn_en_out ;

assign wb_rst_o         = pci_reso_rst_o ;

assign pci_inta_o    = pci_into_pci_intan_out ;

assign pci_inta_oe_o = pci_into_pci_intan_en_out ;

assign wb_int_o         = pci_into_int_o ;

// WISHBONE SLAVE UNIT OUTPUTS

wire    [31:0]  wbu_sdata_out ;

wire            wbu_ack_out ;

wire            wbu_rty_out ;

wire            wbu_err_out ;

wire            wbu_pciif_req_out ;

wire            wbu_pciif_frame_out ;

wire            wbu_pciif_frame_en_out ;

wire            wbu_pciif_irdy_out ;

wire            wbu_pciif_irdy_en_out ;

wire    [31:0]  wbu_pciif_ad_out ;

wire            wbu_pciif_ad_en_out ;

wire    [3:0]   wbu_pciif_cbe_out ;

wire            wbu_pciif_cbe_en_out ;

wire    [31:0]  wbu_err_addr_out ;

wire    [3:0]   wbu_err_bc_out ;

wire            wbu_err_signal_out ;

wire            wbu_err_source_out ;

wire            wbu_err_rty_exp_out ;

wire            wbu_tabort_rec_out ;

wire            wbu_mabort_rec_out ;

wire    [11:0]  wbu_conf_offset_out ;

wire            wbu_conf_renable_out ;

wire            wbu_conf_wenable_out ;

wire    [3:0]   wbu_conf_be_out ;

wire    [31:0]  wbu_conf_data_out ;

wire            wbu_del_read_comp_pending_out ;

wire            wbu_wbw_fifo_empty_out ;

wire            wbu_ad_load_out ;

wire            wbu_ad_load_on_transfer_out ;

wire            wbu_pciif_frame_load_out ;

// PCI TARGET UNIT OUTPUTS

wire    [31:0]  pciu_adr_out ;

wire    [31:0]  pciu_mdata_out ;

wire            pciu_cyc_out ;

wire            pciu_stb_out ;

wire            pciu_we_out ;

wire    [2:0]   pciu_cti_out ;

wire    [1:0]   pciu_bte_out ;

wire    [3:0]   pciu_sel_out ;

wire            pciu_pciif_trdy_out ;

wire            pciu_pciif_stop_out ;

wire            pciu_pciif_devsel_out ;

wire            pciu_pciif_trdy_en_out ;

wire            pciu_pciif_stop_en_out ;

wire            pciu_pciif_devsel_en_out ;

wire            pciu_ad_load_out ;

wire            pciu_ad_load_on_transfer_out ;

wire   [31:0]   pciu_pciif_ad_out ;

wire            pciu_pciif_ad_en_out ;

wire            pciu_pciif_tabort_set_out ;

wire    [31:0]  pciu_err_addr_out ;

wire    [3:0]   pciu_err_bc_out ;

wire    [31:0]  pciu_err_data_out ;

wire    [3:0]   pciu_err_be_out ;

wire            pciu_err_signal_out ;

wire            pciu_err_source_out ;

wire            pciu_err_rty_exp_out ;

wire    [11:0]  pciu_conf_offset_out ;

wire            pciu_conf_renable_out ;

wire            pciu_conf_wenable_out ;

wire    [3:0]   pciu_conf_be_out ;

wire    [31:0]  pciu_conf_data_out ;

wire            pciu_pci_drcomp_pending_out ;

wire            pciu_pciw_fifo_empty_out ;

// assign pci target unit's outputs to top outputs where possible

assign wbm_adr_o    =   pciu_adr_out ;

assign wbm_dat_o    =   pciu_mdata_out ;

assign wbm_cyc_o    =   pciu_cyc_out ;

assign wbm_stb_o    =   pciu_stb_out ;

assign wbm_we_o     =   pciu_we_out ;

assign wbm_cti_o    =   pciu_cti_out ;

assign wbm_bte_o    =   pciu_bte_out ;

assign wbm_sel_o    =   pciu_sel_out ;

// CONFIGURATION SPACE OUTPUTS

wire    [31:0]  conf_w_data_out ;

wire    [31:0]  conf_r_data_out ;

wire            conf_serr_enable_out ;

wire            conf_perr_response_out ;

wire            conf_pci_master_enable_out ;

wire            conf_mem_space_enable_out ;

wire            conf_io_space_enable_out ;

wire    [7:0]   conf_cache_line_size_to_pci_out ;

wire    [7:0]   conf_cache_line_size_to_wb_out ;

wire            conf_cache_lsize_not_zero_to_wb_out ;

wire    [7:0]   conf_latency_tim_out ;

wire    [pci_ba0_width   - 1:0]   conf_pci_ba0_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ba1_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ba2_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ba3_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ba4_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ba5_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ta0_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ta1_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ta2_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ta3_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ta4_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_ta5_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_am0_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_am1_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_am2_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_am3_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_am4_out ;

wire    [pci_ba1_5_width - 1:0]   conf_pci_am5_out ;

wire            conf_pci_mem_io0_out ;

wire            conf_pci_mem_io1_out ;

wire            conf_pci_mem_io2_out ;

wire            conf_pci_mem_io3_out ;

wire            conf_pci_mem_io4_out ;

wire            conf_pci_mem_io5_out ;

wire    [1:0]   conf_pci_img_ctrl0_out ;

wire    [1:0]   conf_pci_img_ctrl1_out ;

wire    [1:0]   conf_pci_img_ctrl2_out ;

wire    [1:0]   conf_pci_img_ctrl3_out ;

wire    [1:0]   conf_pci_img_ctrl4_out ;

wire    [1:0]   conf_pci_img_ctrl5_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ba0_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ba1_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ba2_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ba3_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ba4_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ba5_out ;

wire            conf_wb_mem_io0_out ;

wire            conf_wb_mem_io1_out ;

wire            conf_wb_mem_io2_out ;

wire            conf_wb_mem_io3_out ;

wire            conf_wb_mem_io4_out ;

wire            conf_wb_mem_io5_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_am0_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_am1_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_am2_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_am3_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_am4_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_am5_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ta0_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ta1_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ta2_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ta3_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ta4_out ;

wire    [19:(20 - `WB_NUM_OF_DEC_ADDR_LINES)]  conf_wb_ta5_out ;

wire    [2:0]   conf_wb_img_ctrl0_out ;

wire    [2:0]   conf_wb_img_ctrl1_out ;

wire    [2:0]   conf_wb_img_ctrl2_out ;

wire    [2:0]   conf_wb_img_ctrl3_out ;

wire    [2:0]   conf_wb_img_ctrl4_out ;

wire    [2:0]   conf_wb_img_ctrl5_out ;

wire    [23:0]  conf_ccyc_addr_out ;

wire            conf_soft_res_out ;

wire            conf_int_out ;

wire            conf_wb_init_complete_out  ;

wire            conf_pci_init_complete_out ;

// PCI IO MUX OUTPUTS

wire        pci_mux_frame_out ;

wire        pci_mux_irdy_out ;

wire        pci_mux_devsel_out ;

wire        pci_mux_trdy_out ;

wire        pci_mux_stop_out ;

wire [3:0]  pci_mux_cbe_out ;

wire [31:0] pci_mux_ad_out ;

wire        pci_mux_ad_load_out ;

wire [31:0] pci_mux_ad_en_out ;

wire        pci_mux_ad_en_unregistered_out ;

wire        pci_mux_frame_en_out ;

wire        pci_mux_irdy_en_out ;

wire        pci_mux_devsel_en_out ;

wire        pci_mux_trdy_en_out ;

wire        pci_mux_stop_en_out ;

wire [3:0]  pci_mux_cbe_en_out ;

wire        pci_mux_par_out ;

wire        pci_mux_par_en_out ;

wire        pci_mux_perr_out ;

wire        pci_mux_perr_en_out ;

wire        pci_mux_serr_out ;

wire        pci_mux_serr_en_out ;

wire        pci_mux_req_out ;

wire        pci_mux_req_en_out ;

// assign outputs to top level outputs

assign pci_ad_oe_o       = pci_mux_ad_en_out ;

assign pci_frame_oe_o   = pci_mux_frame_en_out ;

assign pci_irdy_oe_o    = pci_mux_irdy_en_out ;

assign pci_cbe_oe_o     = pci_mux_cbe_en_out ;

assign pci_par_o         =   pci_mux_par_out ;

assign pci_par_oe_o      =   pci_mux_par_en_out ;

assign pci_perr_o       =   pci_mux_perr_out ;

assign pci_perr_oe_o    =   pci_mux_perr_en_out ;

assign pci_serr_o       =   pci_mux_serr_out ;

assign pci_serr_oe_o    =   pci_mux_serr_en_out ;

assign pci_req_o        =   pci_mux_req_out ;

assign pci_req_oe_o     =   pci_mux_req_en_out ;

assign pci_trdy_oe_o    = pci_mux_trdy_en_out ;

assign pci_devsel_oe_o  = pci_mux_devsel_en_out ;

assign pci_stop_oe_o    = pci_mux_stop_en_out ;

assign pci_trdy_o       =  pci_mux_trdy_out ;

assign pci_devsel_o     = pci_mux_devsel_out ;

assign pci_stop_o       = pci_mux_stop_out ;

assign pci_ad_o          = pci_mux_ad_out ;

assign pci_frame_o      = pci_mux_frame_out ;

assign pci_irdy_o       = pci_mux_irdy_out ;

assign pci_cbe_o        = pci_mux_cbe_out ;

// duplicate output register's outputs

wire            out_bckp_frame_out ;

wire            out_bckp_irdy_out ;

wire            out_bckp_devsel_out ;

wire            out_bckp_trdy_out ;

wire            out_bckp_stop_out ;

wire    [3:0]   out_bckp_cbe_out ;

wire            out_bckp_cbe_en_out ;

wire    [31:0]  out_bckp_ad_out ;

wire            out_bckp_ad_en_out ;

wire            out_bckp_irdy_en_out ;

wire            out_bckp_frame_en_out ;

wire            out_bckp_tar_ad_en_out ;

wire            out_bckp_mas_ad_en_out ;

wire            out_bckp_trdy_en_out ;

wire            out_bckp_par_out ;

wire            out_bckp_par_en_out ;

wire            out_bckp_perr_out ;

wire            out_bckp_perr_en_out ;

wire            out_bckp_serr_out ;

wire            out_bckp_serr_en_out ;

wire            int_pci_frame   = out_bckp_frame_en_out ? out_bckp_frame_out  : pci_frame_i     ;

wire            int_pci_irdy    = out_bckp_irdy_en_out  ? out_bckp_irdy_out   : pci_irdy_i      ;

wire            int_pci_devsel  = out_bckp_trdy_en_out  ? out_bckp_devsel_out : pci_devsel_i    ;

wire            int_pci_trdy    = out_bckp_trdy_en_out  ? out_bckp_trdy_out   : pci_trdy_i      ;

wire            int_pci_stop    = out_bckp_trdy_en_out  ? out_bckp_stop_out   : pci_stop_i      ;

wire    [ 3: 0] int_pci_cbe     = out_bckp_cbe_en_out   ? out_bckp_cbe_out    : pci_cbe_i       ;

wire            int_pci_par     = out_bckp_par_en_out   ? out_bckp_par_out    : pci_par_i       ;

wire            int_pci_perr    = out_bckp_perr_en_out  ? out_bckp_perr_out   : pci_perr_i      ;

// PARITY CHECKER OUTPUTS