eth_top.v

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

  always @ (posedge wb_clk_i or posedge wb_rst_i)
  begin
    if(wb_rst_i)
      begin
        temp_wb_ack_o_reg <=#Tp 1'b0;
        temp_wb_dat_o_reg <=#Tp 32'h0;
        temp_wb_err_o_reg <=#Tp 1'b0;
      end
    else
      begin
        temp_wb_ack_o_reg <=#Tp temp_wb_ack_o & ~temp_wb_ack_o_reg;
        temp_wb_dat_o_reg <=#Tp temp_wb_dat_o;
        temp_wb_err_o_reg <=#Tp temp_wb_err_o & ~temp_wb_err_o_reg;
      end
  end
`endif

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

// Connecting Ethernet registers
eth_registers ethreg1
(
  .DataIn(wb_dat_i),                      .Address(wb_adr_i[9:2]),                    .Rw(wb_we_i), 
  .Cs(RegCs),                             .Clk(wb_clk_i),                             .Reset(wb_rst_i), 
  .DataOut(RegDataOut),                   .r_RecSmall(r_RecSmall), 
  .r_Pad(r_Pad),                          .r_HugEn(r_HugEn),                          .r_CrcEn(r_CrcEn), 
  .r_DlyCrcEn(r_DlyCrcEn),                .r_Rst(r_Rst),                              .r_FullD(r_FullD), 
  .r_ExDfrEn(r_ExDfrEn),                  .r_NoBckof(r_NoBckof),                      .r_LoopBck(r_LoopBck), 
  .r_IFG(r_IFG),                          .r_Pro(r_Pro),                              .r_Iam(), 
  .r_Bro(r_Bro),                          .r_NoPre(r_NoPre),                          .r_TxEn(r_TxEn), 
  .r_RxEn(r_RxEn),                        .Busy_IRQ(Busy_IRQ),                        .RxE_IRQ(RxE_IRQ), 
  .RxB_IRQ(RxB_IRQ),                      .TxE_IRQ(TxE_IRQ),                          .TxB_IRQ(TxB_IRQ), 
  .r_IPGT(r_IPGT), 
  .r_IPGR1(r_IPGR1),                      .r_IPGR2(r_IPGR2),                          .r_MinFL(r_MinFL), 
  .r_MaxFL(r_MaxFL),                      .r_MaxRet(r_MaxRet),                        .r_CollValid(r_CollValid), 
  .r_TxFlow(r_TxFlow),                    .r_RxFlow(r_RxFlow),                        .r_PassAll(r_PassAll), 
  .r_MiiMRst(r_MiiMRst),                  .r_MiiNoPre(r_MiiNoPre),                    .r_ClkDiv(r_ClkDiv), 
  .r_WCtrlData(r_WCtrlData),              .r_RStat(r_RStat),                          .r_ScanStat(r_ScanStat), 
  .r_RGAD(r_RGAD),                        .r_FIAD(r_FIAD),                            .r_CtrlData(r_CtrlData), 
  .NValid_stat(NValid_stat),              .Busy_stat(Busy_stat),                   
  .LinkFail(LinkFail),                    .r_MAC(r_MAC),                              .WCtrlDataStart(WCtrlDataStart),
  .RStatStart(RStatStart),                .UpdateMIIRX_DATAReg(UpdateMIIRX_DATAReg),  .Prsd(Prsd), 
  .r_TxBDNum(r_TxBDNum),                  .TX_BD_NUM_Wr(TX_BD_NUM_Wr),                .int_o(int_o),
  .r_HASH0(r_HASH0),                      .r_HASH1(r_HASH1),                          .r_TxPauseRq(r_TxPauseRq), 
  .r_TxPauseTV(r_TxPauseTV),              .RstTxPauseRq(RstTxPauseRq),                .TxCtrlEndFrm(TxCtrlEndFrm), 
  .StartTxDone(StartTxDone),              .TxClk(mtx_clk_pad_i),                      .RxClk(mrx_clk_pad_i), 
  .ReceivedPauseFrm(ReceivedPauseFrm),
  
  .reg1(reg1), .reg2(reg2), .reg3(reg3), .reg4(reg4)

);



wire  [7:0] RxData;
wire        RxValid;
wire        RxStartFrm;
wire        RxEndFrm;
wire        RxAbort;

wire        WillTransmit;            // Will transmit (to RxEthMAC)
wire        ResetCollision;          // Reset Collision (for synchronizing collision)
wire  [7:0] TxDataOut;               // Transmit Packet Data (to TxEthMAC)
wire        WillSendControlFrame;
wire        ReceiveEnd;
wire        ReceivedPacketGood;
wire        ReceivedLengthOK;
wire        InvalidSymbol;
wire        LatchedCrcError;
wire        RxLateCollision;
wire  [3:0] RetryCntLatched;   
wire  [3:0] RetryCnt;   
wire        StartTxAbort;   
wire        MaxCollisionOccured;   
wire        RetryLimit;   
wire        StatePreamble;   
wire  [1:0] StateData; 

// Connecting MACControl
eth_maccontrol maccontrol1
(
  .MTxClk(mtx_clk_pad_i),                       .TPauseRq(r_TxPauseRq), 
  .TxPauseTV(r_TxPauseTV),                      .TxDataIn(TxData), 
  .TxStartFrmIn(TxStartFrm),                    .TxEndFrmIn(TxEndFrm), 
  .TxUsedDataIn(TxUsedDataIn),                  .TxDoneIn(TxDoneIn), 
  .TxAbortIn(TxAbortIn),                        .MRxClk(mrx_clk_pad_i), 
  .RxData(RxData),                              .RxValid(RxValid), 
  .RxStartFrm(RxStartFrm),                      .RxEndFrm(RxEndFrm),
  .ReceiveEnd(ReceiveEnd),                      .ReceivedPacketGood(ReceivedPacketGood),
  .PassAll(r_PassAll),                          .TxFlow(r_TxFlow), 
  .RxFlow(r_RxFlow),                            .DlyCrcEn(r_DlyCrcEn),
  .MAC(r_MAC),                                  .PadIn(r_Pad | PerPacketPad), 
  .PadOut(PadOut),                              .CrcEnIn(r_CrcEn | PerPacketCrcEn), 
  .CrcEnOut(CrcEnOut),                          .TxReset(r_Rst), 
  .RxReset(r_Rst),                              .ReceivedLengthOK(ReceivedLengthOK),
  .TxDataOut(TxDataOut),                        .TxStartFrmOut(TxStartFrmOut), 
  .TxEndFrmOut(TxEndFrmOut),                    .TxUsedDataOut(TxUsedData), 
  .TxDoneOut(TxDone),                           .TxAbortOut(TxAbort), 
  .WillSendControlFrame(WillSendControlFrame),  .TxCtrlEndFrm(TxCtrlEndFrm), 
  .ReceivedPauseFrm(ReceivedPauseFrm)
);



wire TxCarrierSense;          // Synchronized CarrierSense (to Tx clock)
wire Collision;               // Synchronized Collision

reg CarrierSense_Tx1;
reg CarrierSense_Tx2;
reg Collision_Tx1;
reg Collision_Tx2;

reg RxEnSync;                 // Synchronized Receive Enable
reg CarrierSense_Rx1;
reg RxCarrierSense;           // Synchronized CarrierSense (to Rx clock)
reg WillTransmit_q;
reg WillTransmit_q2;



// Muxed MII receive data valid
assign MRxDV_Lb = r_LoopBck? mtxen_pad_o : mrxdv_pad_i & RxEnSync;

// Muxed MII Receive Error
assign MRxErr_Lb = r_LoopBck? mtxerr_pad_o : mrxerr_pad_i & RxEnSync;

// Muxed MII Receive Data
assign MRxD_Lb[3:0] = r_LoopBck? mtxd_pad_o[3:0] : mrxd_pad_i[3:0];



// Connecting TxEthMAC
eth_txethmac txethmac1
(
  .MTxClk(mtx_clk_pad_i),             .Reset(r_Rst),                      .CarrierSense(TxCarrierSense), 
  .Collision(Collision),              .TxData(TxDataOut),                 .TxStartFrm(TxStartFrmOut), 
  .TxUnderRun(TxUnderRun),            .TxEndFrm(TxEndFrmOut),             .Pad(PadOut),  
  .MinFL(r_MinFL),                    .CrcEn(CrcEnOut),                   .FullD(r_FullD), 
  .HugEn(r_HugEn),                    .DlyCrcEn(r_DlyCrcEn),              .IPGT(r_IPGT), 
  .IPGR1(r_IPGR1),                    .IPGR2(r_IPGR2),                    .CollValid(r_CollValid), 
  .MaxRet(r_MaxRet),                  .NoBckof(r_NoBckof),                .ExDfrEn(r_ExDfrEn), 
  .MaxFL(r_MaxFL),                    .MTxEn(mtxen_pad_o),                .MTxD(mtxd_pad_o), 
  .MTxErr(mtxerr_pad_o),              .TxUsedData(TxUsedDataIn),          .TxDone(TxDoneIn), 
  .TxRetry(TxRetry),                  .TxAbort(TxAbortIn),                .WillTransmit(WillTransmit), 
  .ResetCollision(ResetCollision),    .RetryCnt(RetryCnt),                .StartTxDone(StartTxDone), 
  .StartTxAbort(StartTxAbort),        .MaxCollisionOccured(MaxCollisionOccured), .LateCollision(LateCollision),   
  .StartDefer(StartDefer),            .StatePreamble(StatePreamble),      .StateData(StateData)   
);




wire  [15:0]  RxByteCnt;
wire          RxByteCntEq0;
wire          RxByteCntGreat2;
wire          RxByteCntMaxFrame;
wire          RxCrcError;
wire          RxStateIdle;
wire          RxStatePreamble;
wire          RxStateSFD;
wire   [1:0]  RxStateData;




// Connecting RxEthMAC
eth_rxethmac rxethmac1
(
  .MRxClk(mrx_clk_pad_i),               .MRxDV(MRxDV_Lb),                     .MRxD(MRxD_Lb),
  .Transmitting(Transmitting),          .HugEn(r_HugEn),                      .DlyCrcEn(r_DlyCrcEn), 
  .MaxFL(r_MaxFL),                      .r_IFG(r_IFG),                        .Reset(r_Rst),
  .RxData(RxData),                      .RxValid(RxValid),                    .RxStartFrm(RxStartFrm), 
  .RxEndFrm(RxEndFrm),                  .ByteCnt(RxByteCnt), 
  .ByteCntEq0(RxByteCntEq0),            .ByteCntGreat2(RxByteCntGreat2),      .ByteCntMaxFrame(RxByteCntMaxFrame), 
  .CrcError(RxCrcError),                .StateIdle(RxStateIdle),              .StatePreamble(RxStatePreamble), 
  .StateSFD(RxStateSFD),                .StateData(RxStateData),
  .MAC(r_MAC),                          .r_Pro(r_Pro),                        .r_Bro(r_Bro),
  .r_HASH0(r_HASH0),                    .r_HASH1(r_HASH1),                    .RxAbort(RxAbort)
);


// MII Carrier Sense Synchronization
always @ (posedge mtx_clk_pad_i or posedge r_Rst)
begin
  if(r_Rst)
    begin
      CarrierSense_Tx1 <= #Tp 1'b0;
      CarrierSense_Tx2 <= #Tp 1'b0;
    end
  else
    begin
      CarrierSense_Tx1 <= #Tp mcrs_pad_i;
      CarrierSense_Tx2 <= #Tp CarrierSense_Tx1;
    end
end

assign TxCarrierSense = ~r_FullD & CarrierSense_Tx2;


// MII Collision Synchronization
always @ (posedge mtx_clk_pad_i or posedge r_Rst)
begin
  if(r_Rst)
    begin
      Collision_Tx1 <= #Tp 1'b0;
      Collision_Tx2 <= #Tp 1'b0;
    end
  else
    begin
      Collision_Tx1 <= #Tp mcoll_pad_i;
      if(ResetCollision)
        Collision_Tx2 <= #Tp 1'b0;
      else
      if(Collision_Tx1)
        Collision_Tx2 <= #Tp 1'b1;
    end
end


// Synchronized Collision
assign Collision = ~r_FullD & Collision_Tx2;



// Carrier sense is synchronized to receive clock.
always @ (posedge mrx_clk_pad_i or posedge r_Rst)
begin
  if(r_Rst)
    begin
      CarrierSense_Rx1 <= #Tp 1'h0;
      RxCarrierSense <= #Tp 1'h0;
    end
  else
    begin
      CarrierSense_Rx1 <= #Tp mcrs_pad_i;
      RxCarrierSense <= #Tp CarrierSense_Rx1;
    end
end


// Delayed WillTransmit
always @ (posedge mrx_clk_pad_i)
begin
  WillTransmit_q <= #Tp WillTransmit;
  WillTransmit_q2 <= #Tp WillTransmit_q;
end 


assign Transmitting = ~r_FullD & WillTransmit_q2;



// Synchronized Receive Enable
always @ (posedge mrx_clk_pad_i or posedge r_Rst)
begin
  if(r_Rst)
    RxEnSync <= #Tp 1'b0;
  else
  if(~RxCarrierSense | RxCarrierSense & Transmitting)
    RxEnSync <= #Tp r_RxEn;
end 



// Synchronizing WillSendControlFrame to WB_CLK;
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if(wb_rst_i)
    WillSendControlFrame_sync1 <= 1'b0;
  else
    WillSendControlFrame_sync1 <=#Tp WillSendControlFrame;
end

always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if(wb_rst_i)
    WillSendControlFrame_sync2 <= 1'b0;
  else
    WillSendControlFrame_sync2 <=#Tp WillSendControlFrame_sync1;
end

always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if(wb_rst_i)
    WillSendControlFrame_sync3 <= 1'b0;
  else
    WillSendControlFrame_sync3 <=#Tp WillSendControlFrame_sync2;
end

always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if(wb_rst_i)
    RstTxPauseRq <= 1'b0;
  else
    RstTxPauseRq <=#Tp WillSendControlFrame_sync2 & ~WillSendControlFrame_sync3;
end


// Connecting Wishbone module
eth_wishbone wishbone
(
  .WB_CLK_I(wb_clk_i),                .WB_DAT_I(wb_dat_i), 
  .WB_DAT_O(BD_WB_DAT_O), 

  // WISHBONE slave
  .WB_ADR_I(wb_adr_i[9:2]),           .WB_WE_I(wb_we_i), 
  .BDCs(BDCs),                        .WB_ACK_O(BDAck), 

  .Reset(r_Rst), 

  // WISHBONE master
  .m_wb_adr_o(m_wb_adr_o),            .m_wb_sel_o(m_wb_sel_o),                  .m_wb_we_o(m_wb_we_o), 
  .m_wb_dat_i(m_wb_dat_i),            .m_wb_dat_o(m_wb_dat_o),                  .m_wb_cyc_o(m_wb_cyc_o), 
  .m_wb_stb_o(m_wb_stb_o),            .m_wb_ack_i(m_wb_ack_i),                  .m_wb_err_i(m_wb_err_i), 

    //TX
  .MTxClk(mtx_clk_pad_i),             .TxStartFrm(TxStartFrm),                  .TxEndFrm(TxEndFrm), 
  .TxUsedData(TxUsedData),            .TxData(TxData), 
  .TxRetry(TxRetry),                  .TxAbort(TxAbort),                        .TxUnderRun(TxUnderRun), 
  .TxDone(TxDone), 
  .PerPacketCrcEn(PerPacketCrcEn),    .PerPacketPad(PerPacketPad), 

  // Register
  .r_TxEn(r_TxEn),                    .r_RxEn(r_RxEn),                          .r_TxBDNum(r_TxBDNum), 
  .TX_BD_NUM_Wr(TX_BD_NUM_Wr), 

  //RX
  .MRxClk(mrx_clk_pad_i),             .RxData(RxData),                          .RxValid(RxValid), 
  .RxStartFrm(RxStartFrm),            .RxEndFrm(RxEndFrm),                      
  .Busy_IRQ(Busy_IRQ),                .RxE_IRQ(RxE_IRQ),                        .RxB_IRQ(RxB_IRQ), 
  .TxE_IRQ(TxE_IRQ),                  .TxB_IRQ(TxB_IRQ), 

  .RxAbort(RxAbort | (ShortFrame & ~r_RecSmall) | LatchedMRxErr & ~InvalidSymbol | ReceivedPauseFrm & ~r_PassAll), 

  .InvalidSymbol(InvalidSymbol),      .LatchedCrcError(LatchedCrcError),        .RxLength(RxByteCnt),
  .RxLateCollision(RxLateCollision),  .ShortFrame(ShortFrame),                  .DribbleNibble(DribbleNibble),
  .ReceivedPacketTooBig(ReceivedPacketTooBig), .LoadRxStatus(LoadRxStatus),     .RetryCntLatched(RetryCntLatched),
  .RetryLimit(RetryLimit),            .LateCollLatched(LateCollLatched),        .DeferLatched(DeferLatched),   
  .CarrierSenseLost(CarrierSenseLost),.ReceivedPacketGood(ReceivedPacketGood),  
  
  .reg1(reg1), .reg2(reg2), .reg3(reg3), .reg4(reg4)

);



// Connecting MacStatus module
eth_macstatus macstatus1 
(
  .MRxClk(mrx_clk_pad_i),             .Reset(r_Rst),
  .ReceiveEnd(ReceiveEnd),            .ReceivedPacketGood(ReceivedPacketGood),     .ReceivedLengthOK(ReceivedLengthOK), 
  .RxCrcError(RxCrcError),            .MRxErr(MRxErr_Lb),                          .MRxDV(MRxDV_Lb), 
  .RxStateSFD(RxStateSFD),            .RxStateData(RxStateData),                   .RxStatePreamble(RxStatePreamble), 
  .RxStateIdle(RxStateIdle),          .Transmitting(Transmitting),                 .RxByteCnt(RxByteCnt), 
  .RxByteCntEq0(RxByteCntEq0),        .RxByteCntGreat2(RxByteCntGreat2),           .RxByteCntMaxFrame(RxByteCntMaxFrame), 
  .ReceivedPauseFrm(ReceivedPauseFrm),.InvalidSymbol(InvalidSymbol),
  .MRxD(MRxD_Lb),                     .LatchedCrcError(LatchedCrcError),           .Collision(mcoll_pad_i),
  .CollValid(r_CollValid),            .RxLateCollision(RxLateCollision),           .r_RecSmall(r_RecSmall),
  .r_MinFL(r_MinFL),                  .r_MaxFL(r_MaxFL),                           .ShortFrame(ShortFrame),
  .DribbleNibble(DribbleNibble),      .ReceivedPacketTooBig(ReceivedPacketTooBig), .r_HugEn(r_HugEn),
  .LoadRxStatus(LoadRxStatus),        .RetryCnt(RetryCnt),                         .StartTxDone(StartTxDone),
  .StartTxAbort(StartTxAbort),        .RetryCntLatched(RetryCntLatched),           .MTxClk(mtx_clk_pad_i),
  .MaxCollisionOccured(MaxCollisionOccured), .RetryLimit(RetryLimit),              .LateCollision(LateCollision),
  .LateCollLatched(LateCollLatched),  .StartDefer(StartDefer),                     .DeferLatched(DeferLatched),
  .TxStartFrm(TxStartFrmOut),         .StatePreamble(StatePreamble),               .StateData(StateData),
  .CarrierSense(CarrierSense_Tx2),    .CarrierSenseLost(CarrierSenseLost),         .TxUsedData(TxUsedDataIn),
  .LatchedMRxErr(LatchedMRxErr),      .Loopback(r_LoopBck)
);


endmodule