eth_registers.v

这是一个很好的Verilog 编写的8位RISC CPU源码（可做为MCU）

//////////////////////////////////////////////////////////////////////
////                                                              ////
////  eth_registers.v                                             ////
////                                                              ////
////  This file is part of the Ethernet IP core project           ////
////  http://www.opencores.org/projects/ethmac/                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Igor Mohor ([e-mail])                      ////
////                                                              ////
////  All additional information is avaliable in the Readme.txt   ////
////  file.                                                       ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2001, 2002 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: eth_registers.v,v $
// Revision 1.20  2002/09/04 18:40:25  mohor
// ETH_TXCTRL and ETH_RXCTRL registers added. Interrupts related to
// the control frames connected.
//
// Revision 1.19  2002/08/19 16:01:40  mohor
// Only values smaller or equal to 0x80 can be written to TX_BD_NUM register.
// r_TxEn and r_RxEn depend on the limit values of the TX_BD_NUMOut.
//
// Revision 1.18  2002/08/16 22:28:23  mohor
// Syntax error fixed.
//
// Revision 1.17  2002/08/16 22:23:03  mohor
// Syntax error fixed.
//
// Revision 1.16  2002/08/16 22:14:22  mohor
// Synchronous reset added to all registers. Defines used for width. r_MiiMRst
// changed from bit position 10 to 9.
//
// Revision 1.15  2002/08/14 18:26:37  mohor
// LinkFailRegister is reflecting the status of the PHY's link fail status bit.
//
// Revision 1.14  2002/04/22 14:03:44  mohor
// Interrupts are visible in the ETH_INT_SOURCE regardless if they are enabled
// or not.
//
// 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, 
                      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, r_TxPauseTV, r_TxPauseRq, RstTxPauseRq, TxCtrlEndFrm, 
                      StartTxDone, TxClk, RxClk, ReceivedPauseFrm,
                      reg1, reg2, reg3, reg4
                    );

parameter Tp = 1;

input [31:0] reg1, reg2, reg3, reg4;

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;

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;
output [15:0]r_TxPauseTV;
output       r_TxPauseRq;
input        RstTxPauseRq;
input        TxCtrlEndFrm;
input        StartTxDone;
input        TxClk;
input        RxClk;
input        ReceivedPauseFrm;      // sinhroniziraj tale shit da bo delal interrupt. Pazi na PassAll bit

reg          irq_txb;
reg          irq_txe;
reg          irq_rxb;
reg          irq_rxe;
reg          irq_busy;
reg          irq_txc;
reg          irq_rxc;

reg SetTxCIrq_txclk;
reg SetTxCIrq_sync1, SetTxCIrq_sync2, SetTxCIrq_sync3;
reg SetTxCIrq;
reg ResetTxCIrq_sync1, ResetTxCIrq_sync2;

reg SetRxCIrq_rxclk;
reg SetRxCIrq_sync1, SetRxCIrq_sync2, SetRxCIrq_sync3;
reg SetRxCIrq;
reg ResetRxCIrq_sync1, ResetRxCIrq_sync2;

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 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;
wire TXCTRL_Wr      = (Address == `ETH_TX_CTRL_ADR     )  & Write;
wire RXCTRL_Wr      = (Address == `ETH_RX_CTRL_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;
wire [31:0] TXCTRLOut;
wire [31:0] RXCTRLOut;


// MODER Register
eth_register #(`ETH_MODER_WIDTH, `ETH_MODER_DEF)        MODER
  (
   .DataIn    (DataIn[`ETH_MODER_WIDTH-1:0]),
   .DataOut   (MODEROut[`ETH_MODER_WIDTH-1:0]),
   .Write     (MODER_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign MODEROut[31:`ETH_MODER_WIDTH] = 0;

// INT_MASK Register
eth_register #(`ETH_INT_MASK_WIDTH, `ETH_INT_MASK_DEF)  INT_MASK
  (
   .DataIn    (DataIn[`ETH_INT_MASK_WIDTH-1:0]),  
   .DataOut   (INT_MASKOut[`ETH_INT_MASK_WIDTH-1:0]),
   .Write     (INT_MASK_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign INT_MASKOut[31:`ETH_INT_MASK_WIDTH] = 0;

// IPGT Register
eth_register #(`ETH_IPGT_WIDTH, `ETH_IPGT_DEF)          IPGT
  (
   .DataIn    (DataIn[`ETH_IPGT_WIDTH-1:0]),
   .DataOut   (IPGTOut[`ETH_IPGT_WIDTH-1:0]),
   .Write     (IPGT_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign IPGTOut[31:`ETH_IPGT_WIDTH] = 0;

// IPGR1 Register
eth_register #(`ETH_IPGR1_WIDTH, `ETH_IPGR1_DEF)        IPGR1
  (
   .DataIn    (DataIn[`ETH_IPGR1_WIDTH-1:0]),
   .DataOut   (IPGR1Out[`ETH_IPGR1_WIDTH-1:0]),
   .Write     (IPGR1_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign IPGR1Out[31:`ETH_IPGR1_WIDTH] = 0;

// IPGR2 Register
eth_register #(`ETH_IPGR2_WIDTH, `ETH_IPGR2_DEF)        IPGR2
  (
   .DataIn    (DataIn[`ETH_IPGR2_WIDTH-1:0]),
   .DataOut   (IPGR2Out[`ETH_IPGR2_WIDTH-1:0]),
   .Write     (IPGR2_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign IPGR2Out[31:`ETH_IPGR2_WIDTH] = 0;

// PACKETLEN Register
eth_register #(`ETH_PACKETLEN_WIDTH, `ETH_PACKETLEN_DEF) PACKETLEN
  (
   .DataIn    (DataIn),
   .DataOut   (PACKETLENOut),
   .Write     (PACKETLEN_Wr),
   .Clk       (Clk), 
   .Reset     (Reset),
   .SyncReset (1'b0)
  );

// COLLCONF Register
eth_register #(6, `ETH_COLLCONF0_DEF)                   COLLCONF0
  (
   .DataIn    (DataIn[5:0]),
   .DataOut   (COLLCONFOut[5:0]),
   .Write     (COLLCONF_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign COLLCONFOut[15:6] = 0;

eth_register #(4, `ETH_COLLCONF1_DEF)                   COLLCONF1
  (
   .DataIn    (DataIn[19:16]),
   .DataOut   (COLLCONFOut[19:16]),
   .Write     (COLLCONF_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign COLLCONFOut[31:20] = 0;

// TX_BD_NUM Register
eth_register #(`ETH_TX_BD_NUM_WIDTH, `ETH_TX_BD_NUM_DEF) TX_BD_NUM
  (
   .DataIn    (DataIn[`ETH_TX_BD_NUM_WIDTH-1:0]),
   .DataOut   (TX_BD_NUMOut[`ETH_TX_BD_NUM_WIDTH-1:0]),
   .Write     (TX_BD_NUM_Wr & (DataIn<='h80)),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign TX_BD_NUMOut[31:`ETH_TX_BD_NUM_WIDTH] = 0;

// CTRLMODER Register
eth_register #(`ETH_CTRLMODER_WIDTH, `ETH_CTRLMODER_DEF)  CTRLMODER2
  (
   .DataIn    (DataIn[`ETH_CTRLMODER_WIDTH-1:0]),
   .DataOut   (CTRLMODEROut[`ETH_CTRLMODER_WIDTH-1:0]),
   .Write     (CTRLMODER_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign CTRLMODEROut[31:`ETH_CTRLMODER_WIDTH] = 0;

// MIIMODER Register
eth_register #(`ETH_MIIMODER_WIDTH, `ETH_MIIMODER_DEF)    MIIMODER
  (
   .DataIn    (DataIn[`ETH_MIIMODER_WIDTH-1:0]),
   .DataOut   (MIIMODEROut[`ETH_MIIMODER_WIDTH-1:0]),
   .Write     (MIIMODER_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign MIIMODEROut[31:`ETH_MIIMODER_WIDTH] = 0;

// MIICOMMAND Register
eth_register #(1, 0)                                      MIICOMMAND0
  (
   .DataIn    (DataIn[0]),
   .DataOut   (MIICOMMANDOut[0]),
   .Write     (MIICOMMAND_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );

eth_register #(1, 0)                                      MIICOMMAND1
  (
   .DataIn    (DataIn[1]),
   .DataOut   (MIICOMMANDOut[1]),
   .Write     (MIICOMMAND_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (RStatStart)
  );

eth_register #(1, 0)                                      MIICOMMAND2
  (
   .DataIn    (DataIn[2]),
   .DataOut   (MIICOMMANDOut[2]),
   .Write     (MIICOMMAND_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (WCtrlDataStart)