eth_registers.v

人民邮电出版社出版的《FPGA硬件接口设计实践》一书的代码

   .Write     (MAC_ADDR1_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign MAC_ADDR1Out[31:`ETH_MAC_ADDR1_WIDTH] = 0;

// RXHASH0 Register
eth_register #(`ETH_HASH0_WIDTH, `ETH_HASH0_DEF)          RXHASH0
  (
   .DataIn    (DataIn),
   .DataOut   (HASH0Out),
   .Write     (HASH0_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );

// RXHASH1 Register
eth_register #(`ETH_HASH1_WIDTH, `ETH_HASH1_DEF)          RXHASH1
  (
   .DataIn    (DataIn),
   .DataOut   (HASH1Out),
   .Write     (HASH1_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );


// TXCTRL Register
eth_register #((`ETH_TX_CTRL_WIDTH-1), {(`ETH_TX_CTRL_WIDTH-1){1'b0}})      TXCTRL0
  (
   .DataIn    (DataIn[`ETH_TX_CTRL_WIDTH-2:0]),
   .DataOut   (TXCTRLOut[`ETH_TX_CTRL_WIDTH-2:0]),
   .Write     (TXCTRL_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );

eth_register #(1, 1'b0)                                   TXCTRL1     // Request bit is synchronously reset
  (
   .DataIn    (DataIn[16]),
   .DataOut   (TXCTRLOut[16]),
   .Write     (TXCTRL_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (RstTxPauseRq)
  );
assign TXCTRLOut[31:`ETH_TX_CTRL_WIDTH] = 0;


// RXCTRL Register
eth_register #(`ETH_RX_CTRL_WIDTH, `ETH_RX_CTRL_DEF)      RXCTRL
  (
   .DataIn    (DataIn[`ETH_RX_CTRL_WIDTH-1:0]),
   .DataOut   (RXCTRLOut[`ETH_RX_CTRL_WIDTH-1:0]),
   .Write     (RXCTRL_Wr),
   .Clk       (Clk),
   .Reset     (Reset),
   .SyncReset (1'b0)
  );
assign RXCTRLOut[31:`ETH_RX_CTRL_WIDTH] = 0;


// Reading data from registers
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       or TXCTRLOut      or RXCTRLOut
         )
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;
        `ETH_TX_CTRL_ADR      :  DataOut<=TXCTRLOut;
        `ETH_RX_CTRL_ADR      :  DataOut<=RXCTRLOut;

        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];   This signal is not used any more
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] & (TX_BD_NUMOut>0);     // Transmission is enabled when there is at least one TxBD.
assign r_RxEn             = MODEROut[0] & (TX_BD_NUMOut<'h80);  // Reception is enabled when there is  at least one RxBD.

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_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:`ETH_MIISTATUS_WIDTH] = 0; 
assign MIISTATUSOut[2]    = NValid_stat         ; 
assign MIISTATUSOut[1]    = Busy_stat           ; 
assign MIISTATUSOut[0]    = LinkFail            ; 

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];

assign r_TxPauseTV[15:0]  = TXCTRLOut[15:0];
assign r_TxPauseRq        = TXCTRLOut[16];


// Synchronizing TxC Interrupt
always @ (posedge TxClk or posedge Reset)
begin
  if(Reset)
    SetTxCIrq_txclk <=#Tp 1'b0;
  else
  if(TxCtrlEndFrm & StartTxDone & r_TxFlow)
    SetTxCIrq_txclk <=#Tp 1'b1;
  else
  if(ResetTxCIrq_sync2)
    SetTxCIrq_txclk <=#Tp 1'b0;
end


always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    SetTxCIrq_sync1 <=#Tp 1'b0;
  else
    SetTxCIrq_sync1 <=#Tp SetTxCIrq_txclk;
end

always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    SetTxCIrq_sync2 <=#Tp 1'b0;
  else
    SetTxCIrq_sync2 <=#Tp SetTxCIrq_sync1;
end

always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    SetTxCIrq_sync3 <=#Tp 1'b0;
  else
    SetTxCIrq_sync3 <=#Tp SetTxCIrq_sync2;
end

always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    SetTxCIrq <=#Tp 1'b0;
  else
    SetTxCIrq <=#Tp SetTxCIrq_sync2 & ~SetTxCIrq_sync3;
end

always @ (posedge TxClk or posedge Reset)
begin
  if(Reset)
    ResetTxCIrq_sync1 <=#Tp 1'b0;
  else
    ResetTxCIrq_sync1 <=#Tp SetTxCIrq_sync2;
end

always @ (posedge TxClk or posedge Reset)
begin
  if(Reset)
    ResetTxCIrq_sync2 <=#Tp 1'b0;
  else
    ResetTxCIrq_sync2 <=#Tp SetTxCIrq_sync1;
end


// Synchronizing RxC Interrupt
always @ (posedge RxClk or posedge Reset)
begin
  if(Reset)
    SetRxCIrq_rxclk <=#Tp 1'b0;
  else
  if(SetPauseTimer & r_RxFlow)
    SetRxCIrq_rxclk <=#Tp 1'b1;
  else
  if(ResetRxCIrq_sync2 & (~ResetRxCIrq_sync3))
    SetRxCIrq_rxclk <=#Tp 1'b0;
end


always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    SetRxCIrq_sync1 <=#Tp 1'b0;
  else
    SetRxCIrq_sync1 <=#Tp SetRxCIrq_rxclk;
end

always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    SetRxCIrq_sync2 <=#Tp 1'b0;
  else
    SetRxCIrq_sync2 <=#Tp SetRxCIrq_sync1;
end

always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    SetRxCIrq_sync3 <=#Tp 1'b0;
  else
    SetRxCIrq_sync3 <=#Tp SetRxCIrq_sync2;
end

always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    SetRxCIrq <=#Tp 1'b0;
  else
    SetRxCIrq <=#Tp SetRxCIrq_sync2 & ~SetRxCIrq_sync3;
end

always @ (posedge RxClk or posedge Reset)
begin
  if(Reset)
    ResetRxCIrq_sync1 <=#Tp 1'b0;
  else
    ResetRxCIrq_sync1 <=#Tp SetRxCIrq_sync2;
end

always @ (posedge RxClk or posedge Reset)
begin
  if(Reset)
    ResetRxCIrq_sync2 <=#Tp 1'b0;
  else
    ResetRxCIrq_sync2 <=#Tp ResetRxCIrq_sync1;
end

always @ (posedge RxClk or posedge Reset)
begin
  if(Reset)
    ResetRxCIrq_sync3 <=#Tp 1'b0;
  else
    ResetRxCIrq_sync3 <=#Tp ResetRxCIrq_sync2;
end



// 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(SetTxCIrq)
    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(SetRxCIrq)
    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 = {{(32-`ETH_INT_SOURCE_WIDTH){1'b0}}, irq_rxc, irq_txc, irq_busy, irq_rxe, irq_rxb, irq_txe, irq_txb};



endmodule