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//////////////////////////////////////////////////////////////////////

////                                                              ////

//// spiTxRxData.v                                                ////

////                                                              ////

//// This file is part of the spiMaster opencores effort.

//// <http://www.opencores.org/cores//>                           ////

////                                                              ////

//// Module Description:                                          ////

////  Mux access to SPI RX and TX data 

//// 

////  

//// 

////                                                              ////

//// To Do:                                                       ////

////   

////                                                              ////

//// Author(s):                                                   ////

//// - Steve Fielding, sfielding@base2designs.com                 ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2008 Steve Fielding and OPENCORES.ORG          ////

////                                                              ////

//// 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>                   ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//`include "timescale.v"

module spiTxRxData (

  clk,

  rst,

  tx1DataIn,

  tx2DataIn,

  tx3DataIn,

  tx4DataIn,

  tx1DataWEn,

  tx2DataWEn,

  tx3DataWEn,

  tx4DataWEn,

  txDataOut,

  txDataFull,

  txDataFullClr,

  rx1DataRdyClr,

  rx2DataRdyClr,

  rx3DataRdyClr,

  rx4DataRdyClr,

  rxDataIn,

  rxDataOut,

  rxDataRdy,

  rxDataRdySet

);

input clk;

input rst;

input [7:0] tx1DataIn;

input [7:0] tx2DataIn;

input [7:0] tx3DataIn;

input [7:0] tx4DataIn;

input tx1DataWEn;

input tx2DataWEn;

input tx3DataWEn;

input tx4DataWEn;

output [7:0] txDataOut;

reg [7:0] txDataOut;

output txDataFull;

reg txDataFull;

input txDataFullClr;

input rx1DataRdyClr;

input rx2DataRdyClr;

input rx3DataRdyClr;

input rx4DataRdyClr;

input [7:0] rxDataIn;

output [7:0] rxDataOut;

reg [7:0] rxDataOut;

output rxDataRdy;

reg rxDataRdy;

input rxDataRdySet;

// --- Transmit control

always @(posedge clk) begin

  if (rst == 1'b1) begin

    txDataOut <= 8'h00;

    txDataFull <= 1'b0;

  end

  else begin

    if (tx1DataWEn == 1'b1) begin

      txDataOut <= tx1DataIn;

      txDataFull <= 1'b1;

    end

    else if (tx2DataWEn == 1'b1) begin

      txDataOut <= tx2DataIn;

      txDataFull <= 1'b1;

    end

    else if (tx3DataWEn == 1'b1) begin

      txDataOut <= tx3DataIn;

      txDataFull <= 1'b1;

    end

    else if (tx4DataWEn == 1'b1) begin

      txDataOut <= tx4DataIn;

      txDataFull <= 1'b1;

    end

    if (txDataFullClr == 1'b1)

      txDataFull <= 1'b0;

  end

end

// --- Receive control

always @(posedge clk) begin

  if (rst == 1'b1) begin

    rxDataOut <= 8'h00;

    rxDataRdy <= 1'b0;

  end

  else begin

    if (rx1DataRdyClr == 1'b1 || rx2DataRdyClr == 1'b1 || rx3DataRdyClr == 1'b1 || rx4DataRdyClr == 1'b1) begin

      rxDataRdy <= 1'b0;

    end

    if (rxDataRdySet == 1'b1) begin

      rxDataRdy <= 1'b1;

      rxDataOut <= rxDataIn;

    end

  end

end

endmodule