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//////////////////////////////////////////////////////////////////////
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//// ////
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//// MODULE NAME: receive engine ////
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//// ////
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//// DESCRIPTION: Receive Engine Top Level for the 10 Gigabit ////
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//// Ethernet MAC. ////
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//// ////
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//// This file is part of the 10 Gigabit Ethernet IP core project ////
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//// http://www.opencores.org/projects/ethmac10g/ ////
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//// ////
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//// AUTHOR(S): ////
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//// Zheng Cao ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (c) 2005 AUTHORS. All rights reserved. ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS REVISION HISTORY:
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//
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// $Log: not supported by cvs2svn $
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// Revision 1.6 2006/06/16 06:39:59 fisher5090
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// no message
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//
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// Revision 1.5 2006/06/16 06:36:28 Zheng Cao
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// no message
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//
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// Revision 1.4 2006/06/12 10:02:19 Zheng Cao
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// change rxd_in, rxc_in and rxclk_in signals'name to xgmii_rxd, xgmii_rxc and xgmii_rxclk
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//
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// Revision 1.3 2006/06/11 12:15:11 Zheng Cao
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// no message
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//
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// Revision 1.1 2005/12/25 16:43:10 Zheng Cao
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// No flow control included
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//
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//
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//////////////////////////////////////////////////////////////////////
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`include "timescale.v"
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`include "xgiga_define.v"
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module rxReceiveEngine(xgmii_rxclk, rxclk_2x, reset_in, xgmii_rxd, xgmii_rxc, rxStatRegPlus,
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cfgRxRegData_in, rx_data, rx_data_valid, rx_good_frame, rxclk_out,
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rx_bad_frame, rxCfgofRS, rxTxLinkFault);//, fcTxPauseData, fcTxPauseValid);
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input xgmii_rxclk; //Input clock of receive engine
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input rxclk_2x;
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input reset_in; //Globle reset of receive engine
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input [31:0] xgmii_rxd; //XGMII RXD
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input [3:0] xgmii_rxc; //XGMII RXC
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output [17:0] rxStatRegPlus; //Signals for statistics
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input [64:0] cfgRxRegData_in; //Signals for configuration
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output [63:0] rx_data; //Received data sent to upper layer
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output [7:0] rx_data_valid; //Receive data valid indicator
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output rx_good_frame; //Indicate that a good frame has been received
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output rx_bad_frame; //Indicate that a bad frame has been received
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output[2:0] rxCfgofRS; //
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output [1:0] rxTxLinkFault;
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output rxclk_out;
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// output [31:0] fcTxPauseData;
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// output fcTxPauseValid;
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parameter TP =1;
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wire rxclk;
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wire rxclk_180;
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wire locked;
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wire reset_dcm;
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wire reset;
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reg [47:0]MAC_Addr; //MAC Address used in receiving control frame.
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reg vlan_enable; //VLAN Enable
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reg recv_enable; //Receiver Enable
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reg inband_fcs; //In-band FCS Enable, when this bit is '1', the MAC will pass FCS up to client
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reg jumbo_enable;//Jumbo Frame Enable
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reg recv_rst; //Receiver reset
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wire start_da, start_lt;
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wire tagged_frame;
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wire pause_frame;
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wire [47:0] da_addr;
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// wire [15:0] lt_data;
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wire [`COUNTER_WIDTH-1:0] frame_cnt;
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wire [2:0] terminator_location;
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wire get_sfd,get_error_code,get_terminator, get_terminator_d1;
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wire receiving;
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wire receiving_d1,receiving_d2;
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wire length_error;
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wire large_error;
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wire small_error;
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wire padded_frame;
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wire length_65_127;
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wire length_128_255;
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wire length_256_511;
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wire length_512_1023;
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wire length_1024_max;
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wire jumbo_frame;
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wire local_invalid;
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wire broad_valid;
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wire multi_valid;
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wire good_frame_get, bad_frame_get;
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wire wait_crc_check;
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wire crc_check_valid;
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wire crc_check_invalid;
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wire check_reset;
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wire [1:0]link_fault;
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//////////////////////////////////////////
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// Input Registers
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//////////////////////////////////////////
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wire [63:0] rxd64;
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wire [63:0] CRC_DATA;
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wire [7:0] rxc8;
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assign rxTxLinkFault = link_fault;
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// assign fcTxPauseValid = pause_frame;
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//////////////////////////////////////////
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// Read Receiver Configuration Word
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//////////////////////////////////////////
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reg[52:0] cfgRxRegData;
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always@(posedge rxclk or posedge reset)begin
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if(reset)
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cfgRxRegData <=#TP 0;
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else
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cfgRxRegData<=#TP cfgRxRegData_in;
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end
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always@(posedge rxclk or posedge reset)begin
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if(reset) begin
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MAC_Addr <= 0;
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vlan_enable <= 0;
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recv_enable <= 0;
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inband_fcs <= 0;
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jumbo_enable <= 0;
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recv_rst <= 0;
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end
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else begin
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MAC_Addr <= cfgRxRegData[47:0];
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vlan_enable <= cfgRxRegData[48];
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recv_enable <= cfgRxRegData[49];
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inband_fcs <= cfgRxRegData[50];
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jumbo_enable <= cfgRxRegData[51];
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recv_rst <= cfgRxRegData[52];
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end
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end
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//////////////////////////////////////////////////
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// Used to count number of received frames(G&B)
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//////////////////////////////////////////////////
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reg[7:0] cnt;
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reg cnt_en;
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always@(posedge rxclk or posedge reset) begin
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if (reset)
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cnt_en <=0;
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else if(get_sfd)
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cnt_en <=1;
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else if(rx_bad_frame|rx_good_frame)
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cnt_en <=0;
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else
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cnt_en <=cnt_en;
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end
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always@(posedge rxclk or posedge reset) begin
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if (reset)
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cnt <=0;
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else if(cnt_en)
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cnt<=cnt + 1;
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else
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cnt <=0;
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end
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/////////////////////////////////////////
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// Reset signals
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/////////////////////////////////////////
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assign reset_dcm = reset_in | recv_rst;
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assign reset = ~locked;
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/////////////////////////////////////////
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// Write Configuration Words of RS
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/////////////////////////////////////////
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assign rxCfgofRS[0] = ~link_fault[0] & link_fault[1]; //get local fault
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assign rxCfgofRS[1] = link_fault[0] & link_fault[1]; //get remote fault
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assign rxCfgofRS[2] = locked; //Receive DCM locked
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////////////////////////////////////////
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// Signals for Pause Operation
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////////////////////////////////////////
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assign fcTxPauseValid = pause_frame;
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// assign fcTxPauseData = {16{1'b0},rxd64[15:0]};
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////////////////////////////////////////
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// Receive Clock Generator
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////////////////////////////////////////
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assign rxclk_out = rxclk;
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rxClkgen rxclk_gen(.rxclk_in(xgmii_rxclk),
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.reset(reset_dcm),
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.rxclk(rxclk), // system clock
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.rxclk_180(rxclk_180), //reversed clock
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.locked(locked)
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);
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//////////////////////////////////////
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// Rx Engine DataPath
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//////////////////////////////////////
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rxDataPath datapath_main(.rxclk(rxclk), .reset(reset), .rxd64(rxd64), .rxc8(rxc8), .inband_fcs(inband_fcs), .receiving(receiving),
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.start_da(start_da), .start_lt(start_lt), .wait_crc_check(wait_crc_check), .get_sfd(get_sfd),
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.get_terminator(get_terminator), .get_error_code(get_error_code), .tagged_frame(tagged_frame), .pause_frame(pause_frame),
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.da_addr(da_addr), .terminator_location(terminator_location), .CRC_DATA(CRC_DATA), .rx_data_valid(rx_data_valid),
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.rx_data(rx_data), .get_terminator_d1(get_terminator_d1),.bad_frame_get(bad_frame_get),.good_frame_get(good_frame_get),
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.check_reset(check_reset),.rx_good_frame(rx_good_frame),.rx_bad_frame(rx_bad_frame));//,.fcTxPauseData(fcTxPauseData));
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//////////////////////////////////////
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// Destination Address Checker
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//////////////////////////////////////
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rxDAchecker dachecker(.rxclk(rxclk), .reset(reset), .local_invalid(local_invalid), .broad_valid(broad_valid), .multi_valid(multi_valid), .MAC_Addr(MAC_Addr),
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.da_addr(da_addr));
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/////////////////////////////////////
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// Length/Type field checker
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/////////////////////////////////////
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rxLenTypChecker lenchecker(.rxclk(rxclk), .reset(reset), .get_terminator(get_terminator), .terminator_location(terminator_location),
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.jumbo_enable(jumbo_enable), .tagged_frame(tagged_frame), .frame_cnt(frame_cnt), .vlan_enable(vlan_enable),
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.length_error(length_error), .large_error(large_error),.small_error(small_error), .padded_frame(padded_frame),
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.length_65_127(length_65_127), .length_128_255(length_128_255), .length_256_511(length_256_511), .length_512_1023(length_512_1023),
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.length_1024_max(length_1024_max), .jumbo_frame(jumbo_frame)
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);
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/////////////////////////////////////
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// Counters used in Receive Engine
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/////////////////////////////////////
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rxNumCounter counters(.rxclk(rxclk), .reset(reset), .receiving(receiving), .frame_cnt(frame_cnt));
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/////////////////////////////////////
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// State Machine in Receive Process
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/////////////////////////////////////
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rxStateMachine statemachine(.rxclk(rxclk), .reset(reset), .recv_enable(recv_enable), .get_sfd(get_sfd), .local_invalid(local_invalid),
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.length_error(length_error), .crc_check_valid(crc_check_valid), .crc_check_invalid(crc_check_invalid),
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.start_da(start_da), .start_lt(start_lt), .receiving(receiving),.good_frame_get(good_frame_get),
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.bad_frame_get(bad_frame_get), .get_error_code(get_error_code), .wait_crc_check(wait_crc_check), .get_terminator(get_terminator),
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.receiving_d1(receiving_d1),.check_reset(check_reset));
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/////////////////////////////////////
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// CRC Check module
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/////////////////////////////////////
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rxCRC crcmodule(.rxclk(rxclk), .reset(reset), .CRC_DATA(CRC_DATA), .get_terminator(get_terminator), .terminator_location(terminator_location),
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.crc_check_invalid(crc_check_invalid), .crc_check_valid(crc_check_valid),.receiving(receiving),.receiving_d1(receiving_d1),
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.get_terminator_d1(get_terminator_d1), .wait_crc_check(wait_crc_check),.get_error_code(get_error_code));
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/////////////////////////////////////
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// RS Layer
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/////////////////////////////////////
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rxRSLayer rx_rs(.rxclk(rxclk), .rxclk_180(rxclk_180), .rxclk_2x(rxclk_2x), .reset(reset), .link_fault(link_fault), .rxd64(rxd64), .rxc8(rxc8), .rxd_in(xgmii_rxd), .rxc_in(xgmii_rxc));
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/////////////////////////////////////
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// Statistic module
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/////////////////////////////////////
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rxStatModule rx_stat(.rxclk(rxclk),.reset(reset),.good_frame_get(good_frame_get), .large_error(large_error),.small_error(small_error), .crc_check_invalid(crc_check_invalid),
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.receiving(receiving), .padded_frame(padded_frame), .pause_frame(pause_frame), .broad_valid(broad_valid), .multi_valid(multi_valid),
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.length_65_127(length_65_127), .length_128_255(length_128_255), .length_256_511(length_256_511), .length_512_1023(length_512_1023),
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.length_1024_max(length_1024_max), .jumbo_frame(jumbo_frame),.get_error_code(get_error_code), .rxStatRegPlus(rxStatRegPlus));
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endmodule
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