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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  File name: pci_target32_interface.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 $
// Revision 1.2  2001/10/05 08:14:30  mihad
// Updated all files with inclusion of timescale file for simulation purposes.
//
// Revision 1.1.1.1  2001/10/02 15:33:47  mihad
// New project directory structure
//
//
 
`include "bus_commands.v"
`include "pci_constants.v"
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
 
module PCI_TARGET32_INTERFACE
(
    // system inputs
    clk_in,
    reset_in,
 
    // PCI Target side of INTERFACE
    address_in,
    addr_claim_out,
    bc_in,
    bc0_in,
    data_in,
    data_out,
    be_in,
    req_in,
    rdy_in,
    addr_phase_in,
    bckp_devsel_in,
    bckp_trdy_in,
    bckp_stop_in,
    last_reg_in,
    frame_reg_in,
    fetch_pcir_fifo_in,
    load_medium_reg_in,
    sel_fifo_mreg_in,
    sel_conf_fifo_in,
    fetch_conf_in,
    load_to_pciw_fifo_in,
    load_to_conf_in,
    same_read_out,
 
        norm_access_to_config_out,
        read_completed_out,
        read_processing_out,
        target_abort_out,
        disconect_wo_data_out,
        disconect_w_data_out,
        pciw_fifo_full_out,
        pcir_fifo_data_err_out,
        wbw_fifo_empty_out,
        wbu_del_read_comp_pending_out,
 
        // Delayed synchronizacion module signals
        req_out,
    done_out,
    in_progress_out,
        req_req_pending_in,
    req_comp_pending_in,
        addr_out,
    be_out,
    we_out,
    bc_out,
    burst_ok_out,
        strd_addr_in,
        strd_bc_in,
    status_in,
    comp_flush_in,
 
        // FIFO signals
        pcir_fifo_renable_out,
        pcir_fifo_data_in,
        pcir_fifo_be_in,
        pcir_fifo_control_in,
        pcir_fifo_flush_out,
        pcir_fifo_almost_empty_in,
        pcir_fifo_empty_in,
        pciw_fifo_wenable_out,
        pciw_fifo_addr_data_out,
        pciw_fifo_cbe_out,
        pciw_fifo_control_out,
        pciw_fifo_two_left_in,
        pciw_fifo_almost_full_in,
        pciw_fifo_full_in,
        wbw_fifo_empty_in,
        wbu_del_read_comp_pending_in,
 
        // Configuration space signals
        conf_hit_out,
        conf_addr_out,
        conf_data_out,
        conf_data_in,
        conf_be_out,
        conf_we_out,
        conf_re_out,
        mem_enable_in,
        io_enable_in,
        mem_io_addr_space0_in,
        mem_io_addr_space1_in,
        mem_io_addr_space2_in,
        mem_io_addr_space3_in,
        mem_io_addr_space4_in,
        mem_io_addr_space5_in,
        pre_fetch_en0_in,
        pre_fetch_en1_in,
        pre_fetch_en2_in,
        pre_fetch_en3_in,
        pre_fetch_en4_in,
        pre_fetch_en5_in,
        pci_base_addr0_in,
        pci_base_addr1_in,
        pci_base_addr2_in,
        pci_base_addr3_in,
        pci_base_addr4_in,
        pci_base_addr5_in,
        pci_addr_mask0_in,
        pci_addr_mask1_in,
        pci_addr_mask2_in,
        pci_addr_mask3_in,
        pci_addr_mask4_in,
        pci_addr_mask5_in,
        pci_tran_addr0_in,
        pci_tran_addr1_in,
        pci_tran_addr2_in,
        pci_tran_addr3_in,
        pci_tran_addr4_in,
        pci_tran_addr5_in,
        addr_tran_en0_in,
        addr_tran_en1_in,
        addr_tran_en2_in,
        addr_tran_en3_in,
        addr_tran_en4_in,
        addr_tran_en5_in
) ;
 
/*==================================================================================================================
System inputs.
==================================================================================================================*/
// PCI side clock and reset
input   clk_in,
        reset_in ;
 
 
/*==================================================================================================================
Side of the PCI Target state machine
==================================================================================================================*/
// Data, byte enables, bus commands and address ports
input   [31:0]   address_in ;            // current request address input - registered
output          addr_claim_out ;        // current request address claim output
input   [3:0]   bc_in ;                          // current request bus command input - registered
input                   bc0_in ;                        // current cycle RW signal
output  [31:0]  data_out ;                       // for read operations - current dataphase data output
input   [31:0]  data_in ;                        // for write operations - current request data input - registered
input   [3:0]    be_in ;                         // current dataphase byte enable inputs - registered
// Port connection control signals from PCI FSM
input           req_in ;                // Read is requested to WB master from PCI side
input           rdy_in ;                // DATA / ADDRESS selection from PCI side when read or write - registered
input                   addr_phase_in ;         // Indicates address phase and also fast-back-to-back address phase - registered
input                   bckp_devsel_in ;        // DEVSEL input (which is registered) equivalent
input                   bckp_trdy_in ;          // TRDY input (which is registered) equivalent
input                   bckp_stop_in ;          // STOP input (which is registered) equivalent
input               last_reg_in ;               // Indicates last data phase - registered
input                   frame_reg_in ;          // FRAME input signal - registered
input               fetch_pcir_fifo_in ;// Read enable for PCIR_FIFO when when read is finishen on WB side
input               load_medium_reg_in ;// Load data from PCIR_FIFO to medium register (first data must be prepared on time)
input               sel_fifo_mreg_in ;  // Read data selection between PCIR_FIFO and medium register
input               sel_conf_fifo_in ;  // Read data selection between Configuration registers and "FIFO"
input               fetch_conf_in ;             // Read enable for configuration space registers
input               load_to_pciw_fifo_in ;// Write enable to PCIW_FIFO
input               load_to_conf_in ;   // Write enable to Configuration space registers
 
 
/*==================================================================================================================
Status outputs to PCI side (FSM)
==================================================================================================================*/
output                  same_read_out ;                         // Indicates the same read request (important when read is finished on WB side)
output                  norm_access_to_config_out ;     // Indicates the access to Configuration space with MEMORY commands
output                  read_completed_out ;            // Indicates that read request is completed on WB side
output                  read_processing_out ;           // Indicates that read request is processing on WB side
output                  target_abort_out ;                      // Indicates target abort termination
output                  disconect_wo_data_out ;         // Indicates disconnect without data termination
output                  disconect_w_data_out ;          // Indicates disconnect with data termination
output                  pciw_fifo_full_out ;            // Indicates that write PCIW_FIFO is full
output                  pcir_fifo_data_err_out ;        // Indicates data error on current data read from PCIR_FIFO
output                  wbw_fifo_empty_out ;            // Indicates that WB SLAVE has no data to be written to PCI bus
output                  wbu_del_read_comp_pending_out ; // Indicates that WB Unit has a delayed read poending!
 
/*==================================================================================================================
Read request interface through Delayed sinchronization module to WB Master
==================================================================================================================*/
// request, completion, done and progress indicator outputs for delayed_sync module where they are synchronized
output                  req_out,                // request qualifier - when 1 it indicates that valid data is provided on outputs
                        done_out,               // done output - when 1 indicates that PCI Target has completed a cycle on its bus
                        in_progress_out ;       // out progress indicator - indicates that current completion is in progress on
                                                                        //   PCI Target side
// pending indication inputs - PCI Target side must know about requests and completions
input                   req_req_pending_in ;    // request pending input for PCI Target side
input                   req_comp_pending_in ;   // completion pending input for PCI Target side - it indicates when completion
                                                                                //   is ready for completing on PCI Target bus
// various data outputs - PCI Target sets address, bus command, byte enables, write enable and burst
output  [31:0]   addr_out ;   // address bus output
output  [3:0]    be_out ;     // byte enable output
output          we_out ;     // write enable output - read/write request indication 1 = write request / 0 = read request
output  [3:0]    bc_out ;     // bus command output
output                  burst_ok_out ;  // pre-fetch enable & burst read - qualifies pre-fetch for access to current image space
 
// completion side signals encoded termination status - 0 = normal completion / 1 = error terminated completion
input   [31:0]   strd_addr_in ;  // Stored requested read access address
input   [3:0]    strd_bc_in ;    // Stored requested read access bus command
input                   status_in ;     // Error status reported - NOT USED because FIFO control bits determin data error status
input               comp_flush_in ;     // If completition counter (2^16 clk periods) has expired, PCIR_FIFO must flush data
 
 
/*==================================================================================================================
PCIR_PCIW_FIFO signals from pci side
==================================================================================================================*/
// PCIR_FIFO control signals used for fetching data from PCIR_FIFO
output                  pcir_fifo_renable_out ;                 // read enable output to PCIR_FIFO
input   [31:0]   pcir_fifo_data_in ;                             // data input from PCIR_FIFO
input   [3:0]    pcir_fifo_be_in ;                               // byte enable input from PCIR_FIFO
input   [3:0]    pcir_fifo_control_in ;                  // control signals input from PCIR_FIFO
output                  pcir_fifo_flush_out ;                   // flush PCIR_FIFO
input                   pcir_fifo_almost_empty_in ;             // almost empty indicator from PCIR_FIFO
input                   pcir_fifo_empty_in ;                    // empty indicator
 
// PCIW_FIFO control signals used for sinking data into PCIW_FIFO and status monitoring
output                  pciw_fifo_wenable_out ;         // write enable output to PCIW_FIFO
output  [31:0]   pciw_fifo_addr_data_out ;       // address / data output signals to PCIW_FIFO
output  [3:0]    pciw_fifo_cbe_out ;                     // command / byte enable signals to PCIW_FIFO
output  [3:0]    pciw_fifo_control_out ;         // control signals to PCIW_FIFO
input                   pciw_fifo_two_left_in ;         // two data spaces left in PCIW_FIFO
input                   pciw_fifo_almost_full_in ;      // almost full indicator from PCIW_FIFO
input                   pciw_fifo_full_in ;                     // full indicator from PCIW_FIFO
 
// WBW_FIFO empy control signal used when delayed read is complete in PCIR_FIFO
input                   wbw_fifo_empty_in ;                     // empty indicator from WBW_FIFO
input                   wbu_del_read_comp_pending_in ; // delayed read pending indicator from WB Unit
 
 
/*==================================================================================================================
Configuration space signals - from and to registers
==================================================================================================================*/
// BUS for reading and writing to configuration space registers
output                  conf_hit_out ;  // like "chip select" for configuration space
output  [11:0]   conf_addr_out ; // address to configuration space when there is access to it
output  [31:0]   conf_data_out ; // data to configuration space - for writing to registers
input   [31:0]   conf_data_in ;  // data from configuration space - for reading from registers
output  [3:0]    conf_be_out ;   // byte enables used for correct writing to configuration space
output                  conf_we_out ;   // write enable control signal - 1 for writing / 0 for nothing
output                  conf_re_out ;   // read enable control signal - 1 for reading / 0 for nothing
 
// Inputs for image control registers
input                   mem_enable_in ; // allowed access to memory mapped image
input                   io_enable_in ;  // allowed access to io mapped image
 
// Inputs needed for determining if image is assigned to memory or io space with pre-fetch and address translation
input                   mem_io_addr_space0_in ; // bit-0 in pci_base_addr0 register
input                   mem_io_addr_space1_in ; // bit-0 in pci_base_addr1 register
input                   mem_io_addr_space2_in ; // bit-0 in pci_base_addr2 register
input                   mem_io_addr_space3_in ; // bit-0 in pci_base_addr3 register
input                   mem_io_addr_space4_in ; // bit-0 in pci_base_addr4 register
input                   mem_io_addr_space5_in ; // bit-0 in pci_base_addr5 register
input                   pre_fetch_en0_in ;      // bit-1 in pci_image_ctr0 register
input                   pre_fetch_en1_in ;      // bit-1 in pci_image_ctr1 register
input                   pre_fetch_en2_in ;      // bit-1 in pci_image_ctr2 register
input                   pre_fetch_en3_in ;      // bit-1 in pci_image_ctr3 register
input                   pre_fetch_en4_in ;      // bit-1 in pci_image_ctr4 register
input                   pre_fetch_en5_in ;      // bit-1 in pci_image_ctr5 register
 
// Input from image registers - register values needed for decoder to work properly
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_base_addr0_in ;     // base address from base address register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_base_addr1_in ; // base address from base address register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_base_addr2_in ; // base address from base address register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_base_addr3_in ; // base address from base address register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_base_addr4_in ; // base address from base address register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_base_addr5_in ; // base address from base address register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_addr_mask0_in ; // masking of base address from address mask register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_addr_mask1_in ; // masking of base address from address mask register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_addr_mask2_in ; // masking of base address from address mask register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_addr_mask3_in ; // masking of base address from address mask register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_addr_mask4_in ; // masking of base address from address mask register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_addr_mask5_in ; // masking of base address from address mask register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_tran_addr0_in ; // translation address from address translation register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_tran_addr1_in ; // translation address from address translation register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_tran_addr2_in ; // translation address from address translation register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_tran_addr3_in ; // translation address from address translation register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_tran_addr4_in ; // translation address from address translation register
input   [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)]    pci_tran_addr5_in ; // translation address from address translation register
 
input                   addr_tran_en0_in ;      // address translation enable bit
input                   addr_tran_en1_in ;      // address translation enable bit
input                   addr_tran_en2_in ;      // address translation enable bit
input                   addr_tran_en3_in ;      // address translation enable bit
input                   addr_tran_en4_in ;      // address translation enable bit
input                   addr_tran_en5_in ;      // address translation enable bit
 
/*==================================================================================================================
END of input / output PORT DEFINITONS !!!
==================================================================================================================*/
 
// address output from address multiplexer
reg             [31:0]   address ;
// prefetch enable for access to selected image space
reg                             pre_fetch_en ;
 
// Input addresses and image hits from address decoders - addresses are multiplexed to address
`ifdef                  HOST
        `ifdef          NO_CNF_IMAGE
                `ifdef  PCI_IMAGE0      // if PCI bridge is HOST and IMAGE0 is assigned as general image space
wire                    hit0_in ;
wire    [31:0]   address0_in ;
wire                    pre_fetch_en0 = pre_fetch_en0_in ;
                `else
wire                    hit0_in         = 1'b0 ;
wire    [31:0]   address0_in     = 32'h0 ;
wire                    pre_fetch_en0 = 1'b0 ;
                `endif
        `else
wire                    hit0_in ;
wire    [31:0]   address0_in ;
wire                    pre_fetch_en0 = pre_fetch_en0_in ;
        `endif
`else // GUEST
wire                    hit0_in ;
wire    [31:0]   address0_in ;
wire                    pre_fetch_en0 = pre_fetch_en0_in ;
`endif
 
wire                    hit1_in ;
wire    [31:0]   address1_in ;
wire                    pre_fetch_en1 = pre_fetch_en1_in ;
 
`ifdef          PCI_IMAGE2
wire                    hit2_in ;
wire    [31:0]   address2_in ;
wire                    pre_fetch_en2 = pre_fetch_en2_in ;
`else
wire                    hit2_in         = 1'b0 ;
wire    [31:0]   address2_in     = 32'h0 ;
wire                    pre_fetch_en2 = 1'b0 ;
`endif
 
`ifdef          PCI_IMAGE3
wire                    hit3_in ;
wire    [31:0]   address3_in ;
wire                    pre_fetch_en3 = pre_fetch_en3_in ;
`else
wire                    hit3_in         = 1'b0 ;
wire    [31:0]   address3_in     = 32'h0 ;
wire                    pre_fetch_en3 = 1'b0 ;
`endif
 
`ifdef          PCI_IMAGE4
wire                    hit4_in ;
wire    [31:0]   address4_in ;
wire                    pre_fetch_en4 = pre_fetch_en4_in ;
`else
wire                    hit4_in         = 1'b0 ;
wire    [31:0]   address4_in     = 32'h0 ;
wire                    pre_fetch_en4 = 1'b0 ;
`endif
 
`ifdef          PCI_IMAGE5
wire                    hit5_in ;
wire    [31:0]   address5_in ;
wire                    pre_fetch_en5 = pre_fetch_en5_in ;
`else
wire                    hit5_in         = 1'b0 ;
wire    [31:0]   address5_in     = 32'h0 ;
wire                    pre_fetch_en5 = 1'b0 ;
`endif
 
// Include address decoders
`ifdef                  HOST
        `ifdef          NO_CNF_IMAGE
                `ifdef  PCI_IMAGE0      // if PCI bridge is HOST and IMAGE0 is assigned as general image space
        PCI_DECODER   #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder0
                                   (.hit                        (hit0_in),
                                        .addr_out               (address0_in),
                                        .addr_in                (address_in),
                                        .bc_in                  (bc_in),
                                        .base_addr              (pci_base_addr0_in),
                                        .mask_addr              (pci_addr_mask0_in),
                                        .tran_addr              (pci_tran_addr0_in),
                                        .at_en                  (addr_tran_en0_in),
                                        .mem_io_space   (mem_io_addr_space0_in),
                                        .mem_en                 (mem_enable_in),
                                        .io_en                  (io_enable_in)
                                        ) ;
                `endif
        `else
        PCI_DECODER   #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder0
                                   (.hit                        (hit0_in),
                                        .addr_out               (address0_in),
                                        .addr_in                (address_in),
                                        .bc_in                  (bc_in),
                                        .base_addr              (pci_base_addr0_in),
                                        .mask_addr              (pci_addr_mask0_in),
                                        .tran_addr              (pci_tran_addr0_in),
                                        .at_en                  (addr_tran_en0_in),
                                        .mem_io_space   (mem_io_addr_space0_in),
                                        .mem_en                 (mem_enable_in),
                                        .io_en                  (io_enable_in)
                                        ) ;
        `endif
`else // GUEST
        PCI_DECODER   #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder0
                                   (.hit                        (hit0_in),
                                        .addr_out               (address0_in),
                                        .addr_in                (address_in),
                                        .bc_in                  (bc_in),
                                        .base_addr              (pci_base_addr0_in),
                                        .mask_addr              (pci_addr_mask0_in),
                                        .tran_addr              (pci_tran_addr0_in),
                                        .at_en                  (addr_tran_en0_in),
                                        .mem_io_space   (mem_io_addr_space0_in),
                                        .mem_en                 (mem_enable_in),
                                        .io_en                  (io_enable_in)
                                        ) ;
`endif
        PCI_DECODER   #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder1
                                   (.hit                        (hit1_in),
                                        .addr_out               (address1_in),
                                        .addr_in                (address_in),
                                        .bc_in                  (bc_in),
                                        .base_addr              (pci_base_addr1_in),
                                        .mask_addr              (pci_addr_mask1_in),
                                        .tran_addr              (pci_tran_addr1_in),
                                        .at_en                  (addr_tran_en1_in),
                                        .mem_io_space   (mem_io_addr_space1_in),
                                        .mem_en                 (mem_enable_in),
                                        .io_en                  (io_enable_in)
                                        ) ;
`ifdef          PCI_IMAGE2
        PCI_DECODER   #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder2
                                   (.hit                        (hit2_in),
                                        .addr_out               (address2_in),
                                        .addr_in                (address_in),
                                        .bc_in                  (bc_in),
                                        .base_addr              (pci_base_addr2_in),
                                        .mask_addr              (pci_addr_mask2_in),
                                        .tran_addr              (pci_tran_addr2_in),
                                        .at_en                  (addr_tran_en2_in),
                                        .mem_io_space   (mem_io_addr_space2_in),
                                        .mem_en                 (mem_enable_in),
                                        .io_en                  (io_enable_in)
                                        ) ;
`endif
`ifdef          PCI_IMAGE3
        PCI_DECODER   #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder3
                                   (.hit                        (hit3_in),
                                        .addr_out               (address3_in),
                                        .addr_in                (address_in),
                                        .bc_in                  (bc_in),
                                        .base_addr              (pci_base_addr3_in),
                                        .mask_addr              (pci_addr_mask3_in),
                                        .tran_addr              (pci_tran_addr3_in),
                                        .at_en                  (addr_tran_en3_in),
                                        .mem_io_space   (mem_io_addr_space3_in),
                                        .mem_en                 (mem_enable_in),
                                        .io_en                  (io_enable_in)
                                        ) ;
`endif
`ifdef          PCI_IMAGE4
        PCI_DECODER   #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder4
                                   (.hit                        (hit4_in),
                                        .addr_out               (address4_in),
                                        .addr_in                (address_in),
                                        .bc_in                  (bc_in),
                                        .base_addr              (pci_base_addr4_in),
                                        .mask_addr              (pci_addr_mask4_in),
                                        .tran_addr              (pci_tran_addr4_in),
                                        .at_en                  (addr_tran_en4_in),
                                        .mem_io_space   (mem_io_addr_space4_in),
                                        .mem_en                 (mem_enable_in),
                                        .io_en                  (io_enable_in)
                                        ) ;
`endif
`ifdef          PCI_IMAGE5
        PCI_DECODER   #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder5
                                   (.hit                        (hit5_in),
                                        .addr_out               (address5_in),
                                        .addr_in                (address_in),
                                        .bc_in                  (bc_in),
                                        .base_addr              (pci_base_addr5_in),
                                        .mask_addr              (pci_addr_mask5_in),
                                        .tran_addr              (pci_tran_addr5_in),
                                        .at_en                  (addr_tran_en5_in),
                                        .mem_io_space   (mem_io_addr_space5_in),
                                        .mem_en                 (mem_enable_in),
                                        .io_en                  (io_enable_in)
                                        ) ;
`endif
 
// Internal signals for image hit determination
reg                             addr_claim ;// address claim signal is asinchronous set for addr_claim_out signal to PCI Target SM
 
// Determining if image 0 is assigned to configuration space or as normal pci to wb access!
//   if normal access is allowed to configuration space, then hit0 is hit0_conf
`ifdef          HOST
        `ifdef  NO_CNF_IMAGE
                        parameter       hit0_conf = 1'b0 ;
        `else
                        parameter       hit0_conf = 1'b1 ;      // if normal access is allowed to configuration space, then hit0 is hit0_conf
        `endif
`else // GUEST
                        parameter       hit0_conf = 1'b1 ;      // if normal access is allowed to configuration space, then hit0 is hit0_conf
`endif
 
// Logic with address mux, determining if address is still in the same image space and if it is prefetced or not
always@(hit5_in or     hit4_in or     hit3_in or     hit2_in or     hit1_in or     hit0_in or
                address5_in or address4_in or address3_in or address2_in or address1_in or address0_in or
                pre_fetch_en5 or
                pre_fetch_en4 or
                pre_fetch_en3 or
                pre_fetch_en2 or
                pre_fetch_en1 or
                pre_fetch_en0
                )
begin
        addr_claim <= (hit5_in || hit4_in) || (hit3_in || hit2_in || hit1_in || hit0_in) ;
        case ({hit5_in, hit4_in, hit3_in, hit2_in, hit0_in})
        5'b10000 :
        begin
                address <= address5_in ;
                pre_fetch_en <= pre_fetch_en5 ;
        end
        5'b01000 :
        begin
                address <= address4_in ;
                pre_fetch_en <= pre_fetch_en4 ;
        end
        5'b00100 :
        begin
                address <= address3_in ;
                pre_fetch_en <= pre_fetch_en3 ;
        end
        5'b00010 :
        begin
                address <= address2_in ;
                pre_fetch_en <= pre_fetch_en2 ;
        end
        5'b00001 :
        begin
                address <= address0_in ;
                pre_fetch_en <= pre_fetch_en0 ;
        end
        default : // IMAGE 1 is always included into PCI bridge
        begin
                address <= address1_in ;
                pre_fetch_en <= pre_fetch_en1 ;
        end
        endcase
end
 
// Address claim output to PCI Target SM
assign  addr_claim_out = addr_claim ;
 
reg             [31:0]   norm_address ;          // stored normal address (decoded and translated) for access to WB
reg                             norm_prf_en ;           // stored pre-fetch enable
reg             [3:0]    norm_bc ;                       // stored bus-command
reg                             same_read_reg ;         // stored SAME_READ information
reg                             target_rd ;             // delayed registered TRDY output equivalent signal
 
always@(posedge clk_in or posedge reset_in)
begin
    if (reset_in)
        begin
                norm_address <= #`FF_DELAY 32'h0000_0000 ;
                norm_prf_en <= #`FF_DELAY 1'b0 ;
                norm_bc <= #`FF_DELAY 4'h0 ;
                same_read_reg <= #`FF_DELAY 1'b0 ;
        end
        else
        begin
                if (addr_phase_in)
                begin
                        norm_address <= #`FF_DELAY address ;
                        norm_prf_en <= #`FF_DELAY pre_fetch_en ;
                        norm_bc <= #`FF_DELAY bc_in ;
                        same_read_reg <= #`FF_DELAY same_read_out ;
                end
        end
end
 
`ifdef          HOST
  `ifdef        NO_CNF_IMAGE
                        reg              [1:0]   strd_address ;          // stored INPUT address for accessing Configuration space registers
  `else
                        reg             [11:0]   strd_address ;          // stored INPUT address for accessing Configuration space registers
  `endif
`else
                        reg             [11:0]   strd_address ;          // stored INPUT address for accessing Configuration space registers
`endif
always@(posedge clk_in or posedge reset_in)
begin
    if (reset_in)
        begin
                strd_address <= #`FF_DELAY 0 ;
        end
        else
        begin
                if (addr_phase_in)
                begin
`ifdef          HOST
  `ifdef        NO_CNF_IMAGE
                        strd_address <= #`FF_DELAY address_in[1:0] ;
  `else
                        strd_address <= #`FF_DELAY address_in[11:0] ;
  `endif
`else
                        strd_address <= #`FF_DELAY address_in[11:0] ;
`endif
                end
        end
end
 
always@(posedge clk_in or posedge reset_in)
begin
    if (reset_in)
        begin
                target_rd               <= #`FF_DELAY 1'b0 ;
        end
        else
        begin
                if (same_read_reg && !bckp_trdy_in)
                        target_rd       <= #`FF_DELAY 1'b1 ;// Signal indicates when target ready is deaserted on PCI bus
                else if (same_read_reg && bckp_devsel_in && !bckp_stop_in)
                        target_rd       <= #`FF_DELAY 1'b1 ;// Signal indicates when target ready is deaserted on PCI bus
                else if (!same_read_reg)
                        target_rd       <= #`FF_DELAY 1'b0 ;// Signal indicates when target ready is deaserted on PCI bus
        end
end
// '1' indicates asserted TRDY signal when same read operation is performed
wire    target_rd_completed     = target_rd ;
 
reg                             same_read_request ;
 
// When delayed read is completed on WB, addres and bc must be compered, if there is the same read request
always@(address or strd_addr_in or bc_in or strd_bc_in)
begin
        if ((address == strd_addr_in) & (bc_in == strd_bc_in))
                same_read_request <= 1'b1 ;
        else
                same_read_request <= 1'b0 ;
end
 
assign  same_read_out = (same_read_request) ; // && ~pcir_fifo_empty_in) ;
 
// Signals for byte enable checking
reg                             addr_burst_ok ;
reg                             io_be_ok ;
reg                             conf_be_ok ;
 
// Byte enable checking for IO, MEMORY and CONFIGURATION spaces - be_in is active low!
always@(strd_address or be_in)
begin
        case (strd_address[1:0])
        2'b11 :
        begin
                addr_burst_ok <= 1'b0 ;
                io_be_ok <= (be_in[2] && be_in[1] && be_in[0]) ; // only be3 can be active
                conf_be_ok <= 1'b0 ;
        end
        2'b10 :
        begin
                addr_burst_ok <= 1'b0 ;
                io_be_ok <= (~be_in[2] && be_in[1] && be_in[0]) || (be_in[3] && be_in[2] && be_in[1] && be_in[0]) ;
                conf_be_ok <= 1'b0 ;
        end
        2'b01 :
        begin
                addr_burst_ok <= 1'b0 ;
                io_be_ok <= (~be_in[1] && be_in[0]) || (be_in[3] && be_in[2] && be_in[1] && be_in[0]) ;
                conf_be_ok <= 1'b0 ;
        end
        default :       // 2'b00
        begin
                addr_burst_ok <= 1'b1 ;
                io_be_ok <= (~be_in[0]) || (be_in[3] && be_in[2] && be_in[1] && be_in[0]) ;
                conf_be_ok <= 1'b1 ;
        end
        endcase
end
 
reg                             calc_target_abort ;
// Target abort indication regarding the registered bus command and current signals for byte enable checking
always@(norm_bc or hit0_in or io_be_ok or conf_be_ok)
begin
        case (norm_bc)
        // READ COMMANDS
        `BC_IO_READ :
        begin
                case ({hit0_in, hit0_conf})
`ifdef          HOST
        `ifdef  NO_CNF_IMAGE
        `else
                2'b11 :
                begin
                        calc_target_abort <= 1'b1 ;
                end
        `endif
`else
                2'b11 :
                begin
                        calc_target_abort <= 1'b1 ;
                end
`endif
                default :
                begin
                        if (io_be_ok)
                        begin
                                calc_target_abort <= 1'b0 ;
                        end
                        else
                        begin
                                calc_target_abort <= 1'b1 ;
                        end
                end
                endcase
        end
        `BC_MEM_READ :
        begin
                calc_target_abort <= 1'b0 ;
        end
        `BC_CONF_READ :
        begin
                case (conf_be_ok)
                1'b1 :
                begin
                        calc_target_abort <= 1'b0 ;
                end
                default :
                begin
                        calc_target_abort <= 1'b1 ;
                end
                endcase
        end
        `BC_MEM_READ_LN,
        `BC_MEM_READ_MUL :
        begin
                case ({hit0_in, hit0_conf})
`ifdef          HOST
        `ifdef  NO_CNF_IMAGE
        `else
                2'b11 :
                begin
                        calc_target_abort <= 1'b1 ;
                end
        `endif
`else
                2'b11 :
                begin
                        calc_target_abort <= 1'b1 ;
                end
`endif
                default :
                begin
                        calc_target_abort <= 1'b0 ;
                end
                endcase
        end
        // WRITE COMMANDS
        `BC_IO_WRITE :
        begin
                case ({hit0_in, hit0_conf})
`ifdef          HOST
        `ifdef  NO_CNF_IMAGE
        `else
                2'b11 :
                begin
                        calc_target_abort <= 1'b1 ;
                end
        `endif
`else
                2'b11 :
                begin
                        calc_target_abort <= 1'b1 ;
                end
`endif
                default :
                begin
                        if (io_be_ok)
                        begin
                                calc_target_abort <= 1'b0 ;
                        end
                        else
                        begin
                                calc_target_abort <= 1'b1 ;
                        end
                end
                endcase
        end
        `BC_MEM_WRITE :
        begin
                calc_target_abort <= 1'b0 ;
        end
        `BC_CONF_WRITE :
        begin
                case (conf_be_ok)
                1'b1 :
                begin
                        calc_target_abort <= 1'b0 ;
                end
                default :
                begin
                        calc_target_abort <= 1'b1 ;
                end
                endcase
        end
        `BC_MEM_WRITE_INVAL :
        begin
                case ({hit0_in, hit0_conf})
`ifdef          HOST
        `ifdef  NO_CNF_IMAGE
        `else
                2'b11 :
                begin
                        calc_target_abort <= 1'b1 ;
                end
        `endif
`else
                2'b11 :
                begin
                        calc_target_abort <= 1'b1 ;
                end
`endif
                default :
                begin
                        calc_target_abort <= 1'b0 ;
                end
                endcase
        end
        default :
        begin
                calc_target_abort <= 1'b0 ;
        end
        endcase
end
 
wire [3:0]       pcir_fifo_control_input = pcir_fifo_empty_in ? 4'h0 : pcir_fifo_control_in ;
 
// Medium registers for data and control busses from PCIR_FIFO
reg             [31:0]   pcir_fifo_data_reg ;
reg             [3:0]    pcir_fifo_ctrl_reg ;
 
always@(posedge clk_in or posedge reset_in)
begin
    if (reset_in)
    begin
        pcir_fifo_data_reg <= #`FF_DELAY 32'h0000_0000 ;
        pcir_fifo_ctrl_reg <=  #`FF_DELAY 4'h0 ;
    end
    else
    begin
        if (load_medium_reg_in)
        begin
                pcir_fifo_data_reg <= #`FF_DELAY pcir_fifo_data_in ;
                pcir_fifo_ctrl_reg <= #`FF_DELAY pcir_fifo_control_input ;
        end
    end
end
 
// selecting "fifo data" from medium registers or from PCIR_FIFO
wire [31:0]      pcir_fifo_data = (sel_fifo_mreg_in && !pcir_fifo_empty_in) ? pcir_fifo_data_in : pcir_fifo_data_reg ;
wire [3:0]       pcir_fifo_ctrl = (sel_fifo_mreg_in && !pcir_fifo_empty_in) ? pcir_fifo_control_input : pcir_fifo_ctrl_reg ;
 
// signal assignments to PCI Target FSM
assign  read_completed_out = req_comp_pending_in ; // completion pending input for requesting side of the bridge
assign  read_processing_out = req_req_pending_in ; // request pending input for requesting side
  // when '1', the bus command is IO command - not supported commands are checked in pci_decoder modules
  wire  io_memory_bus_command = !norm_bc[3] && !norm_bc[2] ;
assign  disconect_wo_data_out = (
        ((/*pcir_fifo_ctrl[`LAST_CTRL_BIT] ||*/ pcir_fifo_empty_in || ~burst_ok_out/*addr_burst_ok*/ || io_memory_bus_command) &&
                ~bc0_in && ~frame_reg_in) ||
        ((pciw_fifo_full_in || pciw_fifo_almost_full_in || pciw_fifo_two_left_in || ~addr_burst_ok || io_memory_bus_command) &&
                bc0_in && ~frame_reg_in)
                                                                ) ;
assign  disconect_w_data_out =  (
        ( burst_ok_out  && !io_memory_bus_command && ~bc0_in ) ||
        ( addr_burst_ok && !io_memory_bus_command && bc0_in )
                                                                ) ;
assign  target_abort_out = ( ~addr_phase_in && calc_target_abort ) ;
 
`ifdef          HOST
        `ifdef  NO_CNF_IMAGE
                        // signal assignments to PCI Target FSM
                        assign  norm_access_to_config_out = 1'b0 ;
                        // control signal assignments to read request sinchronization module
                        assign  done_out =  (target_rd_completed && last_reg_in) ;
                        assign  in_progress_out = (same_read_reg && ~bckp_trdy_in) ;
                        // signal used for PCIR_FIFO flush (with comp_flush_in signal)
                        wire    pcir_fifo_flush = (target_rd_completed && last_reg_in && ~pcir_fifo_empty_in) ;
        `else
                        // signal assignments to PCI Target FSM
                        assign  norm_access_to_config_out = (hit0_in && hit0_conf) ;
                        // control signal assignments to read request sinchronization module
                        assign  done_out =  (~sel_conf_fifo_in && target_rd_completed && last_reg_in) ;
                        assign  in_progress_out = (~sel_conf_fifo_in && same_read_reg && ~bckp_trdy_in) ;
                        // signal used for PCIR_FIFO flush (with comp_flush_in signal)
                        wire    pcir_fifo_flush = (~sel_conf_fifo_in && target_rd_completed && last_reg_in && ~pcir_fifo_empty_in) ;
        `endif
`else
                        // signal assignments to PCI Target FSM
                        assign  norm_access_to_config_out = (hit0_in && hit0_conf) ;
                        // control signal assignments to read request sinchronization module
                        assign  done_out =  (~sel_conf_fifo_in && target_rd_completed && last_reg_in) ;
                        assign  in_progress_out = (~sel_conf_fifo_in && same_read_reg && ~bckp_trdy_in) ;
                        // signal used for PCIR_FIFO flush (with comp_flush_in signal)
                        wire    pcir_fifo_flush = (~sel_conf_fifo_in && target_rd_completed && last_reg_in && ~pcir_fifo_empty_in) ;
`endif
 
// flush signal for PCIR_FIFO must be registered, since it asinchronously resets some status registers
wire            pcir_fifo_flush_reg ;
async_reset_flop                  async_reset_as_pcir_flush
(
    .data_in              (comp_flush_in || pcir_fifo_flush),
    .clk_in               (clk_in),
    .async_reset_data_out (pcir_fifo_flush_reg),
    .reset_in                     (reset_in)
) ;
 
// signal assignments from fifo to PCI Target FSM
assign  wbw_fifo_empty_out = wbw_fifo_empty_in ;
assign  wbu_del_read_comp_pending_out = wbu_del_read_comp_pending_in ;
assign  pciw_fifo_full_out = (pciw_fifo_full_in || pciw_fifo_almost_full_in || pciw_fifo_two_left_in) ;
assign  pcir_fifo_data_err_out = pcir_fifo_ctrl[`DATA_ERROR_CTRL_BIT] && !sel_conf_fifo_in ;
// signal assignments to fifo
assign  pcir_fifo_flush_out                                                     = pcir_fifo_flush_reg ;
assign  pcir_fifo_renable_out                                           = fetch_pcir_fifo_in && !pcir_fifo_empty_in ;
assign  pciw_fifo_wenable_out                                           = load_to_pciw_fifo_in ;
assign  pciw_fifo_control_out[`ADDR_CTRL_BIT]           = ~rdy_in ;
assign  pciw_fifo_control_out[`BURST_BIT]                       = rdy_in ? ~frame_reg_in : 1'b0 ;
assign  pciw_fifo_control_out[`DATA_ERROR_CTRL_BIT]     = 1'b0 ;
assign  pciw_fifo_control_out[`LAST_CTRL_BIT]           = rdy_in ?
                (last_reg_in || pciw_fifo_almost_full_in || ~addr_burst_ok || io_memory_bus_command) : 1'b0 ;
 
`ifdef          HOST
        `ifdef  NO_CNF_IMAGE
                        // data and address outputs assignments to PCI Target FSM
                        assign  data_out = pcir_fifo_data ;
        `else
                        // data and address outputs assignments to PCI Target FSM
                        assign  data_out = sel_conf_fifo_in ? conf_data_in : pcir_fifo_data ;
        `endif
`else
                        // data and address outputs assignments to PCI Target FSM
                        assign  data_out = sel_conf_fifo_in ? conf_data_in : pcir_fifo_data ;
`endif
 
// data and address outputs assignments to read request sinchronization module
assign  req_out = req_in ;
        // this address is stored in delayed_sync module and is connected back as strd_addr_in 
assign  addr_out = norm_address[31:0] ; // correction of 2 LSBits is done in wb_master module, original address must be saved
assign  be_out = be_in ;
assign  we_out = 1'b0 ;
assign  bc_out = norm_bc ;
// burst is OK for reads when there is ((MEM_READ_LN or MEM_READ_MUL) and AD[1:0]==2'b00) OR
//   (MEM_READ and Prefetchable_IMAGE and AD[1:0]==2'b00)
assign  burst_ok_out = (norm_bc[3] && addr_burst_ok) || (norm_bc[2] && norm_prf_en && addr_burst_ok) ;
// data and address outputs assignments to PCIW_FIFO - correction of 2 LSBits 
assign  pciw_fifo_addr_data_out = rdy_in ? data_in : {norm_address[31:2], norm_address[1] && io_memory_bus_command,
                                                                                                                                                  norm_address[0] && io_memory_bus_command} ;
assign  pciw_fifo_cbe_out = rdy_in ? be_in : norm_bc ;
// data and address outputs assignments to Configuration space
`ifdef          HOST
        `ifdef  NO_CNF_IMAGE
                        assign  conf_data_out   = 32'h0 ;
                        assign  conf_addr_out   = 12'h0 ;
                        assign  conf_be_out             = 4'b0 ;
                        assign  conf_we_out             = 1'h0 ;
        `else
                        assign  conf_data_out   = data_in ;
                        assign  conf_addr_out   = strd_address[11:0] ;
                        assign  conf_be_out             = be_in ;
                        assign  conf_we_out             = load_to_conf_in ;
        `endif
`else
                        assign  conf_data_out   = data_in ;
                        assign  conf_addr_out   = strd_address[11:0] ;
                        assign  conf_be_out             = be_in ;
                        assign  conf_we_out             = load_to_conf_in ;
`endif
// NOT USED NOW, SONCE READ IS ASYNCHRONOUS
//assign        conf_re_out = fetch_conf_in ;
assign  conf_re_out = 1'b0 ;
 
endmodule

Line No.	Rev	Author	Line
1	2	mihad	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// File name: pci_target32_interface.v ////`
4			`//// ////`
5			`//// This file is part of the "PCI bridge" project ////`
6			`//// http://www.opencores.org/cores/pci/ ////`
7			`//// ////`
8			`//// Author(s): ////`
9			`//// - Tadej Markovic, tadej@opencores.org ////`
10			`//// ////`
11			`//// All additional information is avaliable in the README.txt ////`
12			`//// file. ////`
13			`//// ////`
14			`//// ////`
15			`//////////////////////////////////////////////////////////////////////`
16			`//// ////`
17			`//// Copyright (C) 2000 Tadej Markovic, tadej@opencores.org ////`
18			`//// ////`
19			`//// This source file may be used and distributed without ////`
20			`//// restriction provided that this copyright statement is not ////`
21			`//// removed from the file and that any derivative work contains ////`
22			`//// the original copyright notice and the associated disclaimer. ////`
23			`//// ////`
24			`//// This source file is free software; you can redistribute it ////`
25			`//// and/or modify it under the terms of the GNU Lesser General ////`
26			`//// Public License as published by the Free Software Foundation; ////`
27			`//// either version 2.1 of the License, or (at your option) any ////`
28			`//// later version. ////`
29			`//// ////`
30			`//// This source is distributed in the hope that it will be ////`
31			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
32			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
33			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
34			`//// details. ////`
35			`//// ////`
36			`//// You should have received a copy of the GNU Lesser General ////`
37			`//// Public License along with this source; if not, download it ////`
38			`//// from http://www.opencores.org/lgpl.shtml ////`
39			`//// ////`
40			`//////////////////////////////////////////////////////////////////////`
41			`//`
42			`// CVS Revision History`
43			`//`
44			`// $Log: not supported by cvs2svn $`
45	21	mihad	`// Revision 1.2 2001/10/05 08:14:30 mihad`
46			`// Updated all files with inclusion of timescale file for simulation purposes.`
47			`//`
48	6	mihad	`// Revision 1.1.1.1 2001/10/02 15:33:47 mihad`
49			`// New project directory structure`
50	2	mihad	`//`
51	6	mihad	`//`
52	2	mihad
53			`include "bus_commands.v"
54	21	mihad	`include "pci_constants.v"
55
56			`// synopsys translate_off`
57	6	mihad	`include "timescale.v"
58	21	mihad	`// synopsys translate_on`
59	2	mihad
60			`module PCI_TARGET32_INTERFACE`
61			`(`
62			`// system inputs`
63			`clk_in,`
64			`reset_in,`
65	21	mihad
66	2	mihad	`// PCI Target side of INTERFACE`
67			`address_in,`
68			`addr_claim_out,`
69			`bc_in,`
70			`bc0_in,`
71			`data_in,`
72			`data_out,`
73			`be_in,`
74			`req_in,`
75			`rdy_in,`
76			`addr_phase_in,`
77	21	mihad	`bckp_devsel_in,`
78	2	mihad	`bckp_trdy_in,`
79	21	mihad	`bckp_stop_in,`
80	2	mihad	`last_reg_in,`
81			`frame_reg_in,`
82			`fetch_pcir_fifo_in,`
83			`load_medium_reg_in,`
84			`sel_fifo_mreg_in,`
85			`sel_conf_fifo_in,`
86			`fetch_conf_in,`
87			`load_to_pciw_fifo_in,`
88			`load_to_conf_in,`
89			`same_read_out,`
90
91			`norm_access_to_config_out,`
92			`read_completed_out,`
93			`read_processing_out,`
94			`target_abort_out,`
95			`disconect_wo_data_out,`
96	21	mihad	`disconect_w_data_out,`
97	2	mihad	`pciw_fifo_full_out,`
98			`pcir_fifo_data_err_out,`
99			`wbw_fifo_empty_out,`
100	21	mihad	`wbu_del_read_comp_pending_out,`
101
102	2	mihad	`// Delayed synchronizacion module signals`
103	21	mihad	`req_out,`
104			`done_out,`
105	2	mihad	`in_progress_out,`
106	21	mihad	`req_req_pending_in,`
107	2	mihad	`req_comp_pending_in,`
108	21	mihad	`addr_out,`
109			`be_out,`
110			`we_out,`
111			`bc_out,`
112			`burst_ok_out,`
113	2	mihad	`strd_addr_in,`
114			`strd_bc_in,`
115			`status_in,`
116			`comp_flush_in,`
117
118			`// FIFO signals`
119	21	mihad	`pcir_fifo_renable_out,`
120			`pcir_fifo_data_in,`
121			`pcir_fifo_be_in,`
122	2	mihad	`pcir_fifo_control_in,`
123	21	mihad	`pcir_fifo_flush_out,`
124			`pcir_fifo_almost_empty_in,`
125	2	mihad	`pcir_fifo_empty_in,`
126	21	mihad	`pciw_fifo_wenable_out,`
127			`pciw_fifo_addr_data_out,`
128			`pciw_fifo_cbe_out,`
129			`pciw_fifo_control_out,`
130			`pciw_fifo_two_left_in,`
131	2	mihad	`pciw_fifo_almost_full_in,`
132			`pciw_fifo_full_in,`
133			`wbw_fifo_empty_in,`
134	21	mihad	`wbu_del_read_comp_pending_in,`
135
136	2	mihad	`// Configuration space signals`
137			`conf_hit_out,`
138			`conf_addr_out,`
139			`conf_data_out,`
140			`conf_data_in,`
141			`conf_be_out,`
142			`conf_we_out,`
143			`conf_re_out,`
144			`mem_enable_in,`
145			`io_enable_in,`
146			`mem_io_addr_space0_in,`
147			`mem_io_addr_space1_in,`
148			`mem_io_addr_space2_in,`
149			`mem_io_addr_space3_in,`
150			`mem_io_addr_space4_in,`
151			`mem_io_addr_space5_in,`
152			`pre_fetch_en0_in,`
153			`pre_fetch_en1_in,`
154			`pre_fetch_en2_in,`
155			`pre_fetch_en3_in,`
156			`pre_fetch_en4_in,`
157			`pre_fetch_en5_in,`
158			`pci_base_addr0_in,`
159			`pci_base_addr1_in,`
160			`pci_base_addr2_in,`
161			`pci_base_addr3_in,`
162			`pci_base_addr4_in,`
163			`pci_base_addr5_in,`
164			`pci_addr_mask0_in,`
165			`pci_addr_mask1_in,`
166			`pci_addr_mask2_in,`
167			`pci_addr_mask3_in,`
168			`pci_addr_mask4_in,`
169			`pci_addr_mask5_in,`
170			`pci_tran_addr0_in,`
171			`pci_tran_addr1_in,`
172			`pci_tran_addr2_in,`
173			`pci_tran_addr3_in,`
174			`pci_tran_addr4_in,`
175			`pci_tran_addr5_in,`
176			`addr_tran_en0_in,`
177			`addr_tran_en1_in,`
178			`addr_tran_en2_in,`
179			`addr_tran_en3_in,`
180			`addr_tran_en4_in,`
181			`addr_tran_en5_in`
182			`) ;`
183
184			`/*==================================================================================================================`
185			`System inputs.`
186			`==================================================================================================================*/`
187			`// PCI side clock and reset`
188			`input clk_in,`
189			`reset_in ;`
190
191
192			`/*==================================================================================================================`
193	21	mihad	`Side of the PCI Target state machine`
194	2	mihad	`==================================================================================================================*/`
195			`// Data, byte enables, bus commands and address ports`
196			`input [31:0] address_in ; // current request address input - registered`
197			`output addr_claim_out ; // current request address claim output`
198			`input [3:0] bc_in ; // current request bus command input - registered`
199			`input bc0_in ; // current cycle RW signal`
200			`output [31:0] data_out ; // for read operations - current dataphase data output`
201			`input [31:0] data_in ; // for write operations - current request data input - registered`
202			`input [3:0] be_in ; // current dataphase byte enable inputs - registered`
203			`// Port connection control signals from PCI FSM`
204			`input req_in ; // Read is requested to WB master from PCI side`
205			`input rdy_in ; // DATA / ADDRESS selection from PCI side when read or write - registered`
206			`input addr_phase_in ; // Indicates address phase and also fast-back-to-back address phase - registered`
207	21	mihad	`input bckp_devsel_in ; // DEVSEL input (which is registered) equivalent`
208			`input bckp_trdy_in ; // TRDY input (which is registered) equivalent`
209			`input bckp_stop_in ; // STOP input (which is registered) equivalent`
210	2	mihad	`input last_reg_in ; // Indicates last data phase - registered`
211			`input frame_reg_in ; // FRAME input signal - registered`
212			`input fetch_pcir_fifo_in ;// Read enable for PCIR_FIFO when when read is finishen on WB side`
213			`input load_medium_reg_in ;// Load data from PCIR_FIFO to medium register (first data must be prepared on time)`
214			`input sel_fifo_mreg_in ; // Read data selection between PCIR_FIFO and medium register`
215			`input sel_conf_fifo_in ; // Read data selection between Configuration registers and "FIFO"`
216			`input fetch_conf_in ; // Read enable for configuration space registers`
217			`input load_to_pciw_fifo_in ;// Write enable to PCIW_FIFO`
218			`input load_to_conf_in ; // Write enable to Configuration space registers`
219
220
221			`/*==================================================================================================================`
222			`Status outputs to PCI side (FSM)`
223			`==================================================================================================================*/`
224			`output same_read_out ; // Indicates the same read request (important when read is finished on WB side)`
225			`output norm_access_to_config_out ; // Indicates the access to Configuration space with MEMORY commands`
226			`output read_completed_out ; // Indicates that read request is completed on WB side`
227			`output read_processing_out ; // Indicates that read request is processing on WB side`
228			`output target_abort_out ; // Indicates target abort termination`
229	21	mihad	`output disconect_wo_data_out ; // Indicates disconnect without data termination`
230			`output disconect_w_data_out ; // Indicates disconnect with data termination`
231	2	mihad	`output pciw_fifo_full_out ; // Indicates that write PCIW_FIFO is full`
232			`output pcir_fifo_data_err_out ; // Indicates data error on current data read from PCIR_FIFO`
233			`output wbw_fifo_empty_out ; // Indicates that WB SLAVE has no data to be written to PCI bus`
234	21	mihad	`output wbu_del_read_comp_pending_out ; // Indicates that WB Unit has a delayed read poending!`
235	2	mihad
236			`/*==================================================================================================================`
237			`Read request interface through Delayed sinchronization module to WB Master`
238			`==================================================================================================================*/`
239			`// request, completion, done and progress indicator outputs for delayed_sync module where they are synchronized`
240			`output req_out, // request qualifier - when 1 it indicates that valid data is provided on outputs`
241			`done_out, // done output - when 1 indicates that PCI Target has completed a cycle on its bus`
242	21	mihad	`in_progress_out ; // out progress indicator - indicates that current completion is in progress on`
243	2	mihad	`// PCI Target side`
244			`// pending indication inputs - PCI Target side must know about requests and completions`
245			`input req_req_pending_in ; // request pending input for PCI Target side`
246			`input req_comp_pending_in ; // completion pending input for PCI Target side - it indicates when completion`
247			`// is ready for completing on PCI Target bus`
248			`// various data outputs - PCI Target sets address, bus command, byte enables, write enable and burst`
249			`output [31:0] addr_out ; // address bus output`
250			`output [3:0] be_out ; // byte enable output`
251			`output we_out ; // write enable output - read/write request indication 1 = write request / 0 = read request`
252			`output [3:0] bc_out ; // bus command output`
253	21	mihad	`output burst_ok_out ; // pre-fetch enable & burst read - qualifies pre-fetch for access to current image space`
254	2	mihad
255			`// completion side signals encoded termination status - 0 = normal completion / 1 = error terminated completion`
256			`input [31:0] strd_addr_in ; // Stored requested read access address`
257			`input [3:0] strd_bc_in ; // Stored requested read access bus command`
258			`input status_in ; // Error status reported - NOT USED because FIFO control bits determin data error status`
259			`input comp_flush_in ; // If completition counter (2^16 clk periods) has expired, PCIR_FIFO must flush data`
260
261
262			`/*==================================================================================================================`
263			`PCIR_PCIW_FIFO signals from pci side`
264			`==================================================================================================================*/`
265	21	mihad	`// PCIR_FIFO control signals used for fetching data from PCIR_FIFO`
266	2	mihad	`output pcir_fifo_renable_out ; // read enable output to PCIR_FIFO`
267			`input [31:0] pcir_fifo_data_in ; // data input from PCIR_FIFO`
268			`input [3:0] pcir_fifo_be_in ; // byte enable input from PCIR_FIFO`
269			`input [3:0] pcir_fifo_control_in ; // control signals input from PCIR_FIFO`
270			`output pcir_fifo_flush_out ; // flush PCIR_FIFO`
271			`input pcir_fifo_almost_empty_in ; // almost empty indicator from PCIR_FIFO`
272			`input pcir_fifo_empty_in ; // empty indicator`
273
274			`// PCIW_FIFO control signals used for sinking data into PCIW_FIFO and status monitoring`
275			`output pciw_fifo_wenable_out ; // write enable output to PCIW_FIFO`
276			`output [31:0] pciw_fifo_addr_data_out ; // address / data output signals to PCIW_FIFO`
277			`output [3:0] pciw_fifo_cbe_out ; // command / byte enable signals to PCIW_FIFO`
278			`output [3:0] pciw_fifo_control_out ; // control signals to PCIW_FIFO`
279	21	mihad	`input pciw_fifo_two_left_in ; // two data spaces left in PCIW_FIFO`
280	2	mihad	`input pciw_fifo_almost_full_in ; // almost full indicator from PCIW_FIFO`
281			`input pciw_fifo_full_in ; // full indicator from PCIW_FIFO`
282
283			`// WBW_FIFO empy control signal used when delayed read is complete in PCIR_FIFO`
284			`input wbw_fifo_empty_in ; // empty indicator from WBW_FIFO`
285	21	mihad	`input wbu_del_read_comp_pending_in ; // delayed read pending indicator from WB Unit`
286	2	mihad
287
288			`/*==================================================================================================================`
289			`Configuration space signals - from and to registers`
290			`==================================================================================================================*/`
291			`// BUS for reading and writing to configuration space registers`
292			`output conf_hit_out ; // like "chip select" for configuration space`
293			`output [11:0] conf_addr_out ; // address to configuration space when there is access to it`
294			`output [31:0] conf_data_out ; // data to configuration space - for writing to registers`
295			`input [31:0] conf_data_in ; // data from configuration space - for reading from registers`
296			`output [3:0] conf_be_out ; // byte enables used for correct writing to configuration space`
297			`output conf_we_out ; // write enable control signal - 1 for writing / 0 for nothing`
298			`output conf_re_out ; // read enable control signal - 1 for reading / 0 for nothing`
299
300			`// Inputs for image control registers`
301			`input mem_enable_in ; // allowed access to memory mapped image`
302			`input io_enable_in ; // allowed access to io mapped image`
303
304			`// Inputs needed for determining if image is assigned to memory or io space with pre-fetch and address translation`
305	21	mihad	`input mem_io_addr_space0_in ; // bit-0 in pci_base_addr0 register`
306			`input mem_io_addr_space1_in ; // bit-0 in pci_base_addr1 register`
307			`input mem_io_addr_space2_in ; // bit-0 in pci_base_addr2 register`
308			`input mem_io_addr_space3_in ; // bit-0 in pci_base_addr3 register`
309			`input mem_io_addr_space4_in ; // bit-0 in pci_base_addr4 register`
310	2	mihad	`input mem_io_addr_space5_in ; // bit-0 in pci_base_addr5 register`
311			`input pre_fetch_en0_in ; // bit-1 in pci_image_ctr0 register`
312			`input pre_fetch_en1_in ; // bit-1 in pci_image_ctr1 register`
313			`input pre_fetch_en2_in ; // bit-1 in pci_image_ctr2 register`
314			`input pre_fetch_en3_in ; // bit-1 in pci_image_ctr3 register`
315			`input pre_fetch_en4_in ; // bit-1 in pci_image_ctr4 register`
316			`input pre_fetch_en5_in ; // bit-1 in pci_image_ctr5 register`
317
318			`// Input from image registers - register values needed for decoder to work properly`
319			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_base_addr0_in ; // base address from base address register
320			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_base_addr1_in ; // base address from base address register
321			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_base_addr2_in ; // base address from base address register
322			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_base_addr3_in ; // base address from base address register
323			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_base_addr4_in ; // base address from base address register
324			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_base_addr5_in ; // base address from base address register
325			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_addr_mask0_in ; // masking of base address from address mask register
326			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_addr_mask1_in ; // masking of base address from address mask register
327			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_addr_mask2_in ; // masking of base address from address mask register
328			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_addr_mask3_in ; // masking of base address from address mask register
329			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_addr_mask4_in ; // masking of base address from address mask register
330			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_addr_mask5_in ; // masking of base address from address mask register
331			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_tran_addr0_in ; // translation address from address translation register
332			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_tran_addr1_in ; // translation address from address translation register
333			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_tran_addr2_in ; // translation address from address translation register
334			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_tran_addr3_in ; // translation address from address translation register
335			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_tran_addr4_in ; // translation address from address translation register
336			input [31:(32-`PCI_NUM_OF_DEC_ADDR_LINES)] pci_tran_addr5_in ; // translation address from address translation register
337
338			`input addr_tran_en0_in ; // address translation enable bit`
339			`input addr_tran_en1_in ; // address translation enable bit`
340			`input addr_tran_en2_in ; // address translation enable bit`
341			`input addr_tran_en3_in ; // address translation enable bit`
342			`input addr_tran_en4_in ; // address translation enable bit`
343			`input addr_tran_en5_in ; // address translation enable bit`
344
345			`/*==================================================================================================================`
346			`END of input / output PORT DEFINITONS !!!`
347			`==================================================================================================================*/`
348
349			`// address output from address multiplexer`
350			`reg [31:0] address ;`
351			`// prefetch enable for access to selected image space`
352			`reg pre_fetch_en ;`
353
354			`// Input addresses and image hits from address decoders - addresses are multiplexed to address`
355	21	mihad	`ifdef HOST
356			`ifdef NO_CNF_IMAGE
357			`ifdef PCI_IMAGE0 // if PCI bridge is HOST and IMAGE0 is assigned as general image space
358	2	mihad	`wire hit0_in ;`
359			`wire [31:0] address0_in ;`
360	21	mihad	`wire pre_fetch_en0 = pre_fetch_en0_in ;`
361			`else
362			`wire hit0_in = 1'b0 ;`
363			`wire [31:0] address0_in = 32'h0 ;`
364			`wire pre_fetch_en0 = 1'b0 ;`
365			`endif
366			`else
367			`wire hit0_in ;`
368			`wire [31:0] address0_in ;`
369			`wire pre_fetch_en0 = pre_fetch_en0_in ;`
370			`endif
371			`else // GUEST
372			`wire hit0_in ;`
373			`wire [31:0] address0_in ;`
374			`wire pre_fetch_en0 = pre_fetch_en0_in ;`
375			`endif
376
377	2	mihad	`wire hit1_in ;`
378			`wire [31:0] address1_in ;`
379	21	mihad	`wire pre_fetch_en1 = pre_fetch_en1_in ;`
380
381			`ifdef PCI_IMAGE2
382	2	mihad	`wire hit2_in ;`
383			`wire [31:0] address2_in ;`
384	21	mihad	`wire pre_fetch_en2 = pre_fetch_en2_in ;`
385			`else
386			`wire hit2_in = 1'b0 ;`
387			`wire [31:0] address2_in = 32'h0 ;`
388			`wire pre_fetch_en2 = 1'b0 ;`
389	2	mihad	`endif
390	21	mihad
391	2	mihad	`ifdef PCI_IMAGE3
392			`wire hit3_in ;`
393			`wire [31:0] address3_in ;`
394	21	mihad	`wire pre_fetch_en3 = pre_fetch_en3_in ;`
395			`else
396			`wire hit3_in = 1'b0 ;`
397			`wire [31:0] address3_in = 32'h0 ;`
398			`wire pre_fetch_en3 = 1'b0 ;`
399	2	mihad	`endif
400	21	mihad
401	2	mihad	`ifdef PCI_IMAGE4
402			`wire hit4_in ;`
403			`wire [31:0] address4_in ;`
404	21	mihad	`wire pre_fetch_en4 = pre_fetch_en4_in ;`
405			`else
406			`wire hit4_in = 1'b0 ;`
407			`wire [31:0] address4_in = 32'h0 ;`
408			`wire pre_fetch_en4 = 1'b0 ;`
409	2	mihad	`endif
410	21	mihad
411	2	mihad	`ifdef PCI_IMAGE5
412			`wire hit5_in ;`
413			`wire [31:0] address5_in ;`
414	21	mihad	`wire pre_fetch_en5 = pre_fetch_en5_in ;`
415			`else
416			`wire hit5_in = 1'b0 ;`
417			`wire [31:0] address5_in = 32'h0 ;`
418			`wire pre_fetch_en5 = 1'b0 ;`
419	2	mihad	`endif
420
421			`// Include address decoders`
422	21	mihad	`ifdef HOST
423			`ifdef NO_CNF_IMAGE
424			`ifdef PCI_IMAGE0 // if PCI bridge is HOST and IMAGE0 is assigned as general image space
425			PCI_DECODER #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder0
426			`(.hit (hit0_in),`
427			`.addr_out (address0_in),`
428			`.addr_in (address_in),`
429			`.bc_in (bc_in),`
430	2	mihad	`.base_addr (pci_base_addr0_in),`
431	21	mihad	`.mask_addr (pci_addr_mask0_in),`
432			`.tran_addr (pci_tran_addr0_in),`
433	2	mihad	`.at_en (addr_tran_en0_in),`
434	21	mihad	`.mem_io_space (mem_io_addr_space0_in),`
435			`.mem_en (mem_enable_in),`
436	2	mihad	`.io_en (io_enable_in)`
437			`) ;`
438	21	mihad	`endif
439			`else
440			PCI_DECODER #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder0
441			`(.hit (hit0_in),`
442			`.addr_out (address0_in),`
443			`.addr_in (address_in),`
444			`.bc_in (bc_in),`
445			`.base_addr (pci_base_addr0_in),`
446			`.mask_addr (pci_addr_mask0_in),`
447			`.tran_addr (pci_tran_addr0_in),`
448			`.at_en (addr_tran_en0_in),`
449			`.mem_io_space (mem_io_addr_space0_in),`
450			`.mem_en (mem_enable_in),`
451			`.io_en (io_enable_in)`
452			`) ;`
453			`endif
454			`else // GUEST
455			PCI_DECODER #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder0
456			`(.hit (hit0_in),`
457			`.addr_out (address0_in),`
458			`.addr_in (address_in),`
459			`.bc_in (bc_in),`
460			`.base_addr (pci_base_addr0_in),`
461			`.mask_addr (pci_addr_mask0_in),`
462			`.tran_addr (pci_tran_addr0_in),`
463			`.at_en (addr_tran_en0_in),`
464			`.mem_io_space (mem_io_addr_space0_in),`
465			`.mem_en (mem_enable_in),`
466			`.io_en (io_enable_in)`
467			`) ;`
468			`endif
469			PCI_DECODER #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder1
470			`(.hit (hit1_in),`
471			`.addr_out (address1_in),`
472			`.addr_in (address_in),`
473			`.bc_in (bc_in),`
474	2	mihad	`.base_addr (pci_base_addr1_in),`
475	21	mihad	`.mask_addr (pci_addr_mask1_in),`
476			`.tran_addr (pci_tran_addr1_in),`
477			`.at_en (addr_tran_en1_in),`
478			`.mem_io_space (mem_io_addr_space1_in),`
479			`.mem_en (mem_enable_in),`
480	2	mihad	`.io_en (io_enable_in)`
481			`) ;`
482	21	mihad	`ifdef PCI_IMAGE2
483	2	mihad	PCI_DECODER #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder2
484	21	mihad	`(.hit (hit2_in),`
485			`.addr_out (address2_in),`
486			`.addr_in (address_in),`
487			`.bc_in (bc_in),`
488	2	mihad	`.base_addr (pci_base_addr2_in),`
489	21	mihad	`.mask_addr (pci_addr_mask2_in),`
490			`.tran_addr (pci_tran_addr2_in),`
491			`.at_en (addr_tran_en2_in),`
492			`.mem_io_space (mem_io_addr_space2_in),`
493			`.mem_en (mem_enable_in),`
494	2	mihad	`.io_en (io_enable_in)`
495			`) ;`
496			`endif
497			`ifdef PCI_IMAGE3
498	21	mihad	PCI_DECODER #(`PCI_NUM_OF_DEC_ADDR_LINES) decoder3
499			`(.hit (hit3_in),`
500			`.addr_out (address3_in),`

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