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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  eth_registers.v                                             ////
////                                                              ////
////  This file is part of the Ethernet IP core project           ////
////  http://www.opencores.org/projects/ethmac/                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Igor Mohor (igorM@opencores.org)                      ////
////                                                              ////
////  All additional information is avaliable in the Readme.txt   ////
////  file.                                                       ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2001 Authors                                   ////
////                                                              ////
//// 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 1.13  2002/02/26 16:18:09  mohor
// Reset values are passed to registers through parameters
//
// Revision 1.12  2002/02/17 13:23:42  mohor
// Define missmatch fixed.
//
// Revision 1.11  2002/02/16 14:03:44  mohor
// Registered trimmed. Unused registers removed.
//
// Revision 1.10  2002/02/15 11:08:25  mohor
// File format fixed a bit.
//
// Revision 1.9  2002/02/14 20:19:41  billditt
// Modified for Address Checking,
// addition of eth_addrcheck.v
//
// Revision 1.8  2002/02/12 17:01:19  mohor
// HASH0 and HASH1 registers added. 
 
// Revision 1.7  2002/01/23 10:28:16  mohor
// Link in the header changed.
//
// Revision 1.6  2001/12/05 15:00:16  mohor
// RX_BD_NUM changed to TX_BD_NUM (holds number of TX descriptors
// instead of the number of RX descriptors).
//
// Revision 1.5  2001/12/05 10:22:19  mohor
// ETH_RX_BD_ADR register deleted. ETH_RX_BD_NUM is used instead.
//
// Revision 1.4  2001/10/19 08:43:51  mohor
// eth_timescale.v changed to timescale.v This is done because of the
// simulation of the few cores in a one joined project.
//
// Revision 1.3  2001/10/18 12:07:11  mohor
// Status signals changed, Adress decoding changed, interrupt controller
// added.
//
// Revision 1.2  2001/09/24 15:02:56  mohor
// Defines changed (All precede with ETH_). Small changes because some
// tools generate warnings when two operands are together. Synchronization
// between two clocks domains in eth_wishbonedma.v is changed (due to ASIC
// demands).
//
// Revision 1.1  2001/08/06 14:44:29  mohor
// A define FPGA added to select between Artisan RAM (for ASIC) and Block Ram (For Virtex).
// Include files fixed to contain no path.
// File names and module names changed ta have a eth_ prologue in the name.
// File eth_timescale.v is used to define timescale
// All pin names on the top module are changed to contain _I, _O or _OE at the end.
// Bidirectional signal MDIO is changed to three signals (Mdc_O, Mdi_I, Mdo_O
// and Mdo_OE. The bidirectional signal must be created on the top level. This
// is done due to the ASIC tools.
//
// Revision 1.2  2001/08/02 09:25:31  mohor
// Unconnected signals are now connected.
//
// Revision 1.1  2001/07/30 21:23:42  mohor
// Directory structure changed. Files checked and joind together.
//
//
//
//
//
//
 
`include "eth_defines.v"
`include "timescale.v"
 
 
module eth_registers( DataIn, Address, Rw, Cs, Clk, Reset, DataOut, 
                      r_RecSmall, r_Pad, r_HugEn, r_CrcEn, r_DlyCrcEn, 
                      r_Rst, r_FullD, r_ExDfrEn, r_NoBckof, r_LoopBck, r_IFG, 
                      r_Pro, r_Iam, r_Bro, r_NoPre, r_TxEn, r_RxEn, 
                      TxB_IRQ, TxE_IRQ, RxB_IRQ, RxE_IRQ, Busy_IRQ, TxC_IRQ, RxC_IRQ, 
                      r_IPGT, r_IPGR1, r_IPGR2, r_MinFL, r_MaxFL, r_MaxRet, 
                      r_CollValid, r_TxFlow, r_RxFlow, r_PassAll, 
                      r_MiiMRst, r_MiiNoPre, r_ClkDiv, r_WCtrlData, r_RStat, r_ScanStat, 
                      r_RGAD, r_FIAD, r_CtrlData, NValid_stat, Busy_stat, 
                      LinkFail, r_MAC, WCtrlDataStart, RStatStart,
                      UpdateMIIRX_DATAReg, Prsd, r_TxBDNum, TX_BD_NUM_Wr, int_o,
                      r_HASH0, r_HASH1
                    );
 
parameter Tp = 1;
 
input [31:0] DataIn;
input [7:0] Address;
 
input Rw;
input Cs;
input Clk;
input Reset;
 
input WCtrlDataStart;
input RStatStart;
 
input UpdateMIIRX_DATAReg;
input [15:0] Prsd;
 
output [31:0] DataOut;
reg    [31:0] DataOut;
 
output r_RecSmall;
output r_Pad;
output r_HugEn;
output r_CrcEn;
output r_DlyCrcEn;
output r_Rst;
output r_FullD;
output r_ExDfrEn;
output r_NoBckof;
output r_LoopBck;
output r_IFG;
output r_Pro;
output r_Iam;
output r_Bro;
output r_NoPre;
output r_TxEn;
output r_RxEn;
output [31:0] r_HASH0;
output [31:0] r_HASH1;
 
input TxB_IRQ;
input TxE_IRQ;
input RxB_IRQ;
input RxE_IRQ;
input Busy_IRQ;
input TxC_IRQ;
input RxC_IRQ;
 
output [6:0] r_IPGT;
 
output [6:0] r_IPGR1;
 
output [6:0] r_IPGR2;
 
output [15:0] r_MinFL;
output [15:0] r_MaxFL;
 
output [3:0] r_MaxRet;
output [5:0] r_CollValid;
 
output r_TxFlow;
output r_RxFlow;
output r_PassAll;
 
output r_MiiMRst;
output r_MiiNoPre;
output [7:0] r_ClkDiv;
 
output r_WCtrlData;
output r_RStat;
output r_ScanStat;
 
output [4:0] r_RGAD;
output [4:0] r_FIAD;
 
output [15:0]r_CtrlData;
 
 
input NValid_stat;
input Busy_stat;
input LinkFail;
 
output [47:0]r_MAC;
output [7:0] r_TxBDNum;
output       TX_BD_NUM_Wr;
output       int_o;
 
reg          irq_txb;
reg          irq_txe;
reg          irq_rxb;
reg          irq_rxe;
reg          irq_busy;
reg          irq_txc;
reg          irq_rxc;
 
wire Write = Cs &  Rw;
wire Read  = Cs & ~Rw;
 
wire MODER_Wr       = (Address == `ETH_MODER_ADR       )  & Write;
wire INT_SOURCE_Wr  = (Address == `ETH_INT_SOURCE_ADR  )  & Write;
wire INT_MASK_Wr    = (Address == `ETH_INT_MASK_ADR    )  & Write;
wire IPGT_Wr        = (Address == `ETH_IPGT_ADR        )  & Write;
wire IPGR1_Wr       = (Address == `ETH_IPGR1_ADR       )  & Write;
wire IPGR2_Wr       = (Address == `ETH_IPGR2_ADR       )  & Write;
wire PACKETLEN_Wr   = (Address == `ETH_PACKETLEN_ADR   )  & Write;
wire COLLCONF_Wr    = (Address == `ETH_COLLCONF_ADR    )  & Write;
 
wire CTRLMODER_Wr   = (Address == `ETH_CTRLMODER_ADR   )  & Write;
wire MIIMODER_Wr    = (Address == `ETH_MIIMODER_ADR    )  & Write;
wire MIICOMMAND_Wr  = (Address == `ETH_MIICOMMAND_ADR  )  & Write;
wire MIIADDRESS_Wr  = (Address == `ETH_MIIADDRESS_ADR  )  & Write;
wire MIITX_DATA_Wr  = (Address == `ETH_MIITX_DATA_ADR  )  & Write;
wire MIIRX_DATA_Wr  = UpdateMIIRX_DATAReg;     
wire MIISTATUS_Wr   = (Address == `ETH_MIISTATUS_ADR   )  & Write;
wire MAC_ADDR0_Wr   = (Address == `ETH_MAC_ADDR0_ADR   )  & Write;
wire MAC_ADDR1_Wr   = (Address == `ETH_MAC_ADDR1_ADR   )  & Write;
wire HASH0_Wr       = (Address == `ETH_HASH0_ADR   )  & Write;
wire HASH1_Wr       = (Address == `ETH_HASH1_ADR   )  & Write;
assign TX_BD_NUM_Wr = (Address == `ETH_TX_BD_NUM_ADR   )  & Write;
 
 
 
wire [31:0] MODEROut;
wire [31:0] INT_SOURCEOut;
wire [31:0] INT_MASKOut;
wire [31:0] IPGTOut;
wire [31:0] IPGR1Out;
wire [31:0] IPGR2Out;
wire [31:0] PACKETLENOut;
wire [31:0] COLLCONFOut;
wire [31:0] CTRLMODEROut;
wire [31:0] MIIMODEROut;
wire [31:0] MIICOMMANDOut;
wire [31:0] MIIADDRESSOut;
wire [31:0] MIITX_DATAOut;
wire [31:0] MIIRX_DATAOut;
wire [31:0] MIISTATUSOut;
wire [31:0] MAC_ADDR0Out;
wire [31:0] MAC_ADDR1Out;
wire [31:0] TX_BD_NUMOut;
wire [31:0] HASH0Out;
wire [31:0] HASH1Out;
 
 
eth_register #(17, `ETH_MODER_DEF)      MODER        (.DataIn(DataIn[16:0]), .DataOut(MODEROut[16:0]),     .Write(MODER_Wr),      .Clk(Clk), .Reset(Reset));
assign MODEROut[31:17] = 0;
 
eth_register #(7, `ETH_INT_MASK_DEF)     INT_MASK    (.DataIn(DataIn[6:0]),  .DataOut(INT_MASKOut[6:0]),   .Write(INT_MASK_Wr),   .Clk(Clk), .Reset(Reset));
assign INT_MASKOut[31:7] = 0;
 
eth_register #(7, `ETH_IPGT_DEF)         IPGT        (.DataIn(DataIn[6:0]),  .DataOut(IPGTOut[6:0]),       .Write(IPGT_Wr),       .Clk(Clk), .Reset(Reset));
assign IPGTOut[31:7] = 0;
 
eth_register #(7, `ETH_IPGR1_DEF)        IPGR1       (.DataIn(DataIn[6:0]),  .DataOut(IPGR1Out[6:0]),      .Write(IPGR1_Wr),      .Clk(Clk), .Reset(Reset));
assign IPGR1Out[31:7] = 0;
 
eth_register #(7, `ETH_IPGR2_DEF)        IPGR2       (.DataIn(DataIn[6:0]),  .DataOut(IPGR2Out[6:0]),      .Write(IPGR2_Wr),      .Clk(Clk), .Reset(Reset));
assign IPGR2Out[31:7] = 0;
 
eth_register #(32, `ETH_PACKETLEN_DEF)   PACKETLEN   (.DataIn(DataIn),       .DataOut(PACKETLENOut),       .Write(PACKETLEN_Wr),  .Clk(Clk), .Reset(Reset));
 
eth_register #(6, `ETH_COLLCONF0_DEF)    COLLCONF0   (.DataIn(DataIn[5:0]),  .DataOut(COLLCONFOut[5:0]),   .Write(COLLCONF_Wr),   .Clk(Clk), .Reset(Reset));
eth_register #(4, `ETH_COLLCONF1_DEF)    COLLCONF1   (.DataIn(DataIn[19:16]),.DataOut(COLLCONFOut[19:16]), .Write(COLLCONF_Wr),   .Clk(Clk), .Reset(Reset));
assign COLLCONFOut[15:6] = 0;
assign COLLCONFOut[31:20] = 0;
 
eth_register #(8, `ETH_TX_BD_NUM_DEF)    TX_BD_NUM   (.DataIn(DataIn[7:0]),  .DataOut(TX_BD_NUMOut[7:0]), .Write(TX_BD_NUM_Wr),  .Clk(Clk), .Reset(Reset));
assign TX_BD_NUMOut[31:8] = 24'h0;
 
eth_register #(3, `ETH_CTRLMODER_DEF)    CTRLMODER2  (.DataIn(DataIn[2:0]),  .DataOut(CTRLMODEROut[2:0]),  .Write(CTRLMODER_Wr),  .Clk(Clk), .Reset(Reset));
assign CTRLMODEROut[31:3] = 29'h0;
 
eth_register #(11, `ETH_MIIMODER_DEF)    MIIMODER    (.DataIn(DataIn[10:0]), .DataOut(MIIMODEROut[10:0]),  .Write(MIIMODER_Wr),   .Clk(Clk), .Reset(Reset));
assign MIIMODEROut[31:11] = 0;
 
eth_register #(1, 0)                     MIICOMMAND2 (.DataIn(DataIn[2]),    .DataOut(MIICOMMANDOut[2]),   .Write(MIICOMMAND_Wr), .Clk(Clk), .Reset(Reset | WCtrlDataStart));
eth_register #(1, 0)                     MIICOMMAND1 (.DataIn(DataIn[1]),    .DataOut(MIICOMMANDOut[1]),   .Write(MIICOMMAND_Wr), .Clk(Clk), .Reset(Reset | RStatStart));
eth_register #(1, 0)                     MIICOMMAND0 (.DataIn(DataIn[0]),    .DataOut(MIICOMMANDOut[0]),   .Write(MIICOMMAND_Wr), .Clk(Clk), .Reset(Reset));
assign MIICOMMANDOut[31:3] = 29'h0;
 
eth_register #(5, `ETH_MIIADDRESS0_DEF)  MIIADDRESS0 (.DataIn(DataIn[4:0]),  .DataOut(MIIADDRESSOut[4:0]), .Write(MIIADDRESS_Wr), .Clk(Clk), .Reset(Reset));
eth_register #(5, `ETH_MIIADDRESS1_DEF)  MIIADDRESS1 (.DataIn(DataIn[12:8]), .DataOut(MIIADDRESSOut[12:8]),.Write(MIIADDRESS_Wr), .Clk(Clk), .Reset(Reset));
assign MIIADDRESSOut[7:5] = 0;
assign MIIADDRESSOut[31:13] = 0;
 
eth_register #(16, `ETH_MIITX_DATA_DEF)  MIITX_DATA  (.DataIn(DataIn[15:0]), .DataOut(MIITX_DATAOut[15:0]),.Write(MIITX_DATA_Wr), .Clk(Clk), .Reset(Reset));
assign MIITX_DATAOut[31:16] = 0;
 
eth_register #(16, `ETH_MIIRX_DATA_DEF)  MIIRX_DATA  (.DataIn(Prsd[15:0]),   .DataOut(MIIRX_DATAOut[15:0]),.Write(MIIRX_DATA_Wr), .Clk(Clk), .Reset(Reset));
assign MIIRX_DATAOut[31:16] = 0;
 
eth_register #(32, `ETH_MAC_ADDR0_DEF)   MAC_ADDR0   (.DataIn(DataIn),       .DataOut(MAC_ADDR0Out),       .Write(MAC_ADDR0_Wr),  .Clk(Clk), .Reset(Reset));
eth_register #(16, `ETH_MAC_ADDR1_DEF)   MAC_ADDR1   (.DataIn(DataIn[15:0]), .DataOut(MAC_ADDR1Out[15:0]), .Write(MAC_ADDR1_Wr),  .Clk(Clk), .Reset(Reset));
assign MAC_ADDR1Out[31:16] = 0;
 
 
eth_register #(32, `ETH_HASH0_DEF)       RXHASH0     (.DataIn(DataIn),       .DataOut(HASH0Out),           .Write(HASH0_Wr),      .Clk(Clk), .Reset(Reset));
eth_register #(32, `ETH_HASH1_DEF)       RXHASH1     (.DataIn(DataIn),       .DataOut(HASH1Out),           .Write(HASH1_Wr),      .Clk(Clk), .Reset(Reset));
 
 
reg LinkFailRegister;
wire ResetLinkFailRegister = Address == `ETH_MIISTATUS_ADR & Read;
reg ResetLinkFailRegister_q1;
reg ResetLinkFailRegister_q2;
 
always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    begin
      LinkFailRegister <= #Tp 0;
      ResetLinkFailRegister_q1 <= #Tp 0;
      ResetLinkFailRegister_q2 <= #Tp 0;
    end
  else
    begin
      ResetLinkFailRegister_q1 <= #Tp ResetLinkFailRegister;
      ResetLinkFailRegister_q2 <= #Tp ResetLinkFailRegister_q1;
      if(LinkFail)
        LinkFailRegister <= #Tp 1;
      if(~ResetLinkFailRegister_q1 & ResetLinkFailRegister_q2)
        LinkFailRegister <= #Tp 0;    
    end
end
 
 
always @ (Address or Read or MODEROut or INT_SOURCEOut or INT_MASKOut or IPGTOut or 
          IPGR1Out or IPGR2Out or PACKETLENOut or COLLCONFOut or CTRLMODEROut or 
          MIIMODEROut or MIICOMMANDOut or MIIADDRESSOut or MIITX_DATAOut or 
          MIIRX_DATAOut or MIISTATUSOut or MAC_ADDR0Out or MAC_ADDR1Out or 
          TX_BD_NUMOut or HASH0Out or HASH1Out)
begin
  if(Read)  // read
    begin
      case(Address)
        `ETH_MODER_ADR        :  DataOut<=MODEROut;
        `ETH_INT_SOURCE_ADR   :  DataOut<=INT_SOURCEOut;
        `ETH_INT_MASK_ADR     :  DataOut<=INT_MASKOut;
        `ETH_IPGT_ADR         :  DataOut<=IPGTOut;
        `ETH_IPGR1_ADR        :  DataOut<=IPGR1Out;
        `ETH_IPGR2_ADR        :  DataOut<=IPGR2Out;
        `ETH_PACKETLEN_ADR    :  DataOut<=PACKETLENOut;
        `ETH_COLLCONF_ADR     :  DataOut<=COLLCONFOut;
        `ETH_CTRLMODER_ADR    :  DataOut<=CTRLMODEROut;
        `ETH_MIIMODER_ADR     :  DataOut<=MIIMODEROut;
        `ETH_MIICOMMAND_ADR   :  DataOut<=MIICOMMANDOut;
        `ETH_MIIADDRESS_ADR   :  DataOut<=MIIADDRESSOut;
        `ETH_MIITX_DATA_ADR   :  DataOut<=MIITX_DATAOut;
        `ETH_MIIRX_DATA_ADR   :  DataOut<=MIIRX_DATAOut;
        `ETH_MIISTATUS_ADR    :  DataOut<=MIISTATUSOut;
        `ETH_MAC_ADDR0_ADR    :  DataOut<=MAC_ADDR0Out;
        `ETH_MAC_ADDR1_ADR    :  DataOut<=MAC_ADDR1Out;
        `ETH_TX_BD_NUM_ADR    :  DataOut<=TX_BD_NUMOut;
        `ETH_HASH0_ADR        :  DataOut<=HASH0Out;
        `ETH_HASH1_ADR        :  DataOut<=HASH1Out;
        default:             DataOut<=32'h0;
      endcase
    end
  else
    DataOut<=32'h0;
end
 
 
assign r_RecSmall         = MODEROut[16];
assign r_Pad              = MODEROut[15];
assign r_HugEn            = MODEROut[14];
assign r_CrcEn            = MODEROut[13];
assign r_DlyCrcEn         = MODEROut[12];
assign r_Rst              = MODEROut[11];
assign r_FullD            = MODEROut[10];
assign r_ExDfrEn          = MODEROut[9];
assign r_NoBckof          = MODEROut[8];
assign r_LoopBck          = MODEROut[7];
assign r_IFG              = MODEROut[6];
assign r_Pro              = MODEROut[5];
assign r_Iam              = MODEROut[4];
assign r_Bro              = MODEROut[3];
assign r_NoPre            = MODEROut[2];
assign r_TxEn             = MODEROut[1];
assign r_RxEn             = MODEROut[0];
 
assign r_IPGT[6:0]        = IPGTOut[6:0];
 
assign r_IPGR1[6:0]       = IPGR1Out[6:0];
 
assign r_IPGR2[6:0]       = IPGR2Out[6:0];
 
assign r_MinFL[15:0]      = PACKETLENOut[31:16];
assign r_MaxFL[15:0]      = PACKETLENOut[15:0];
 
assign r_MaxRet[3:0]      = COLLCONFOut[19:16];
assign r_CollValid[5:0]   = COLLCONFOut[5:0];
 
assign r_TxFlow           = CTRLMODEROut[2];
assign r_RxFlow           = CTRLMODEROut[1];
assign r_PassAll          = CTRLMODEROut[0];
 
assign r_MiiMRst          = MIIMODEROut[10];
assign r_MiiNoPre         = MIIMODEROut[8];
assign r_ClkDiv[7:0]      = MIIMODEROut[7:0];
 
assign r_WCtrlData        = MIICOMMANDOut[2];
assign r_RStat            = MIICOMMANDOut[1];
assign r_ScanStat         = MIICOMMANDOut[0];
 
assign r_RGAD[4:0]        = MIIADDRESSOut[12:8];
assign r_FIAD[4:0]        = MIIADDRESSOut[4:0];
 
assign r_CtrlData[15:0]   = MIITX_DATAOut[15:0];
 
assign MIISTATUSOut[31:10] = 22'h0           ; 
assign MIISTATUSOut[9]  = NValid_stat        ; 
assign MIISTATUSOut[8]  = Busy_stat          ; 
assign MIISTATUSOut[7:1]= 7'h0               ; 
assign MIISTATUSOut[0]  = LinkFailRegister   ; 
 
assign r_MAC[31:0]        = MAC_ADDR0Out[31:0];
assign r_MAC[47:32]       = MAC_ADDR1Out[15:0];
assign r_HASH1[31:0]      = HASH1Out;
assign r_HASH0[31:0]      = HASH0Out;
 
assign r_TxBDNum[7:0] = TX_BD_NUMOut[7:0];
 
 
// Interrupt generation
 
always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    irq_txb <= 1'b0;
  else
  if(TxB_IRQ)
    irq_txb <= #Tp 1'b1;
  else
  if(INT_SOURCE_Wr & DataIn[0])
    irq_txb <= #Tp 1'b0;
end
 
always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    irq_txe <= 1'b0;
  else
  if(TxE_IRQ)
    irq_txe <= #Tp 1'b1;
  else
  if(INT_SOURCE_Wr & DataIn[1])
    irq_txe <= #Tp 1'b0;
end
 
always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    irq_rxb <= 1'b0;
  else
  if(RxB_IRQ)
    irq_rxb <= #Tp 1'b1;
  else
  if(INT_SOURCE_Wr & DataIn[2])
    irq_rxb <= #Tp 1'b0;
end
 
always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    irq_rxe <= 1'b0;
  else
  if(RxE_IRQ)
    irq_rxe <= #Tp 1'b1;
  else
  if(INT_SOURCE_Wr & DataIn[3])
    irq_rxe <= #Tp 1'b0;
end
 
always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    irq_busy <= 1'b0;
  else
  if(Busy_IRQ)
    irq_busy <= #Tp 1'b1;
  else
  if(INT_SOURCE_Wr & DataIn[4])
    irq_busy <= #Tp 1'b0;
end
 
always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    irq_txc <= 1'b0;
  else
  if(TxC_IRQ)
    irq_txc <= #Tp 1'b1;
  else
  if(INT_SOURCE_Wr & DataIn[5])
    irq_txc <= #Tp 1'b0;
end
 
always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    irq_rxc <= 1'b0;
  else
  if(RxC_IRQ)
    irq_rxc <= #Tp 1'b1;
  else
  if(INT_SOURCE_Wr & DataIn[6])
    irq_rxc <= #Tp 1'b0;
end
 
// Generating interrupt signal
assign int_o = irq_txb  & INT_MASKOut[0] | 
               irq_txe  & INT_MASKOut[1] | 
               irq_rxb  & INT_MASKOut[2] | 
               irq_rxe  & INT_MASKOut[3] | 
               irq_busy & INT_MASKOut[4] | 
               irq_txc  & INT_MASKOut[5] | 
               irq_rxc  & INT_MASKOut[6] ;
 
// For reading interrupt status
assign INT_SOURCEOut = {26'h0, irq_rxc, irq_txc, irq_busy, irq_rxe, irq_rxb, irq_txe, irq_txb};
 
 
 
endmodule