pci_bridge32.v

这是用pci-wishbone核和16450串口核在xilinx的fpga上实现的串口程序

//////////////////////////////////////////////////////////////////////
////                                                              ////
////  File name "pci_bridge32.v"                                  ////
////                                                              ////
////  This file is part of the "PCI bridge" project               ////
////  http://www.opencores.org/cores/pci/                         ////
////                                                              ////
////  Author(s):                                                  ////
////      - Miha Dolenc ([e-mail])                     ////
////      - Tadej Markovic ([e-mail])                  ////
////                                                              ////
////  All additional information is avaliable in the README       ////
////  file.                                                       ////
////                                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2001 Miha Dolenc, [e-mail]          ////
////                                                              ////
//// 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: pci_bridge32.v,v $
// 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

);

// 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 ;