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[/] [pci/] [tags/] [rel_8/] [rtl/] [verilog/] [pci_target32_interface.v] - Rev 26
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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 1.3 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 08:14:30 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) || (last_reg_in && target_rd)) 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'b0 ; end `endif `else 2'b11 : begin calc_target_abort <= 1'b0 ; 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 calc_target_abort <= 1'b0 ; 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'b0 ; end `endif `else 2'b11 : begin calc_target_abort <= 1'b0 ; 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 calc_target_abort <= 1'b0 ; 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
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