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

////                                                              ////

//// wishBoneBI.v                                                 ////

////                                                              ////

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

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

////                                                              ////

//// Module Description:                                          ////

//// 

////                                                              ////

//// To Do:                                                       ////

//// 

////                                                              ////

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

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

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2004 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"

`include "usbhostslave_wishbonebus_h.v"

module wishBoneBI (

  address, dataIn, dataOut, writeEn,

  strobe_i,

  ack_o,

  clk, rst,

  hostControlSel,

  hostRxFifoSel, hostTxFifoSel,

  slaveControlSel,

  slaveEP0RxFifoSel, slaveEP1RxFifoSel, slaveEP2RxFifoSel, slaveEP3RxFifoSel,

  slaveEP0TxFifoSel, slaveEP1TxFifoSel, slaveEP2TxFifoSel, slaveEP3TxFifoSel,

  hostSlaveMuxSel,

  dataFromHostControl,

  dataFromHostRxFifo,

  dataFromHostTxFifo,

  dataFromSlaveControl,

  dataFromEP0RxFifo, dataFromEP1RxFifo, dataFromEP2RxFifo, dataFromEP3RxFifo,

  dataFromEP0TxFifo, dataFromEP1TxFifo, dataFromEP2TxFifo, dataFromEP3TxFifo,

  dataFromHostSlaveMux

   );

input clk;

input rst;

input [7:0] address;

input [7:0] dataIn;

output [7:0] dataOut;

input strobe_i;

output ack_o;

input writeEn;

output hostControlSel;

output hostRxFifoSel;

output hostTxFifoSel;

output slaveControlSel;

output slaveEP0RxFifoSel, slaveEP1RxFifoSel, slaveEP2RxFifoSel, slaveEP3RxFifoSel;

output slaveEP0TxFifoSel, slaveEP1TxFifoSel, slaveEP2TxFifoSel, slaveEP3TxFifoSel;

output hostSlaveMuxSel;

input [7:0] dataFromHostControl;

input [7:0] dataFromHostRxFifo;

input [7:0] dataFromHostTxFifo;

input [7:0] dataFromSlaveControl;

input [7:0] dataFromEP0RxFifo, dataFromEP1RxFifo, dataFromEP2RxFifo, dataFromEP3RxFifo;

input [7:0] dataFromEP0TxFifo, dataFromEP1TxFifo, dataFromEP2TxFifo, dataFromEP3TxFifo;

input [7:0] dataFromHostSlaveMux;

wire clk;

wire rst;

wire [7:0] address;

wire [7:0] dataIn;

reg [7:0] dataOut;

wire writeEn;

wire strobe_i;

reg ack_o;

reg hostControlSel;

reg hostRxFifoSel;

reg hostTxFifoSel;

reg slaveControlSel;

reg slaveEP0RxFifoSel, slaveEP1RxFifoSel, slaveEP2RxFifoSel, slaveEP3RxFifoSel;

reg slaveEP0TxFifoSel, slaveEP1TxFifoSel, slaveEP2TxFifoSel, slaveEP3TxFifoSel;

reg hostSlaveMuxSel;

wire [7:0] dataFromHostControl;

wire [7:0] dataFromHostRxFifo;

wire [7:0] dataFromHostTxFifo;

wire [7:0] dataFromSlaveControl;

wire [7:0] dataFromEP0RxFifo, dataFromEP1RxFifo, dataFromEP2RxFifo, dataFromEP3RxFifo;

wire [7:0] dataFromEP0TxFifo, dataFromEP1TxFifo, dataFromEP2TxFifo, dataFromEP3TxFifo;

wire [7:0] dataFromHostSlaveMux;

//internal wires and regs

reg ack_delayed;

reg ack_immediate;

//address decode and data mux

always @(address or

  dataFromHostControl or

  dataFromHostRxFifo or

  dataFromHostTxFifo or

  dataFromSlaveControl or

  dataFromEP0RxFifo or

  dataFromEP1RxFifo or

  dataFromEP2RxFifo or

  dataFromEP3RxFifo or

  dataFromHostSlaveMux or

  dataFromEP0TxFifo or

  dataFromEP1TxFifo or

  dataFromEP2TxFifo or

  dataFromEP3TxFifo)

begin

  hostControlSel <= 1'b0;

  hostRxFifoSel <= 1'b0;

  hostTxFifoSel <= 1'b0;

  slaveControlSel <= 1'b0;

  slaveEP0RxFifoSel <= 1'b0;

  slaveEP0TxFifoSel <= 1'b0;

  slaveEP1RxFifoSel <= 1'b0;

  slaveEP1TxFifoSel <= 1'b0;

  slaveEP2RxFifoSel <= 1'b0;

  slaveEP2TxFifoSel <= 1'b0;

  slaveEP3RxFifoSel <= 1'b0;

  slaveEP3TxFifoSel <= 1'b0;

  hostSlaveMuxSel <= 1'b0;

  case (address & `ADDRESS_DECODE_MASK)

    `HCREG_BASE : begin

      hostControlSel <= 1'b1;

      dataOut <= dataFromHostControl;

    end

    `HCREG_BASE_PLUS_0X10 : begin

      hostControlSel <= 1'b1;

      dataOut <= dataFromHostControl;

    end

    `HOST_RX_FIFO_BASE : begin

      hostRxFifoSel <= 1'b1;

      dataOut <= dataFromHostRxFifo;

    end

    `HOST_TX_FIFO_BASE : begin

      hostTxFifoSel <= 1'b1;

      dataOut <= dataFromHostTxFifo;

    end

    `SCREG_BASE : begin

      slaveControlSel <= 1'b1;

      dataOut <= dataFromSlaveControl;

    end

    `SCREG_BASE_PLUS_0X10 : begin

      slaveControlSel <= 1'b1;

      dataOut <= dataFromSlaveControl;

    end

    `EP0_RX_FIFO_BASE : begin

      slaveEP0RxFifoSel <= 1'b1;

      dataOut <= dataFromEP0RxFifo;

    end

    `EP0_TX_FIFO_BASE : begin

      slaveEP0TxFifoSel <= 1'b1;

      dataOut <= dataFromEP0TxFifo;

    end

    `EP1_RX_FIFO_BASE : begin

      slaveEP1RxFifoSel <= 1'b1;

      dataOut <= dataFromEP1RxFifo;

    end

    `EP1_TX_FIFO_BASE : begin

      slaveEP1TxFifoSel <= 1'b1;

      dataOut <= dataFromEP1TxFifo;

    end

    `EP2_RX_FIFO_BASE : begin

      slaveEP2RxFifoSel <= 1'b1;

      dataOut <= dataFromEP2RxFifo;

    end

    `EP2_TX_FIFO_BASE : begin

      slaveEP2TxFifoSel <= 1'b1;

      dataOut <= dataFromEP2TxFifo;

    end

    `EP3_RX_FIFO_BASE : begin

      slaveEP3RxFifoSel <= 1'b1;

      dataOut <= dataFromEP3RxFifo;

    end

    `EP3_TX_FIFO_BASE : begin

      slaveEP3TxFifoSel <= 1'b1;

      dataOut <= dataFromEP3TxFifo;

    end

    `HOST_SLAVE_CONTROL_BASE : begin

      hostSlaveMuxSel <= 1'b1;

      dataOut <= dataFromHostSlaveMux;

    end

    default:

      dataOut <= 8'h00;

  endcase

end

//delayed ack

always @(posedge clk) begin

  ack_delayed <= strobe_i;

end

//immediate ack

always @(strobe_i) begin

  ack_immediate <= strobe_i;

end

//select between immediate and delayed ack

always @(writeEn or address or ack_delayed or ack_immediate) begin

  if (writeEn == 1'b0 &&

      (address == `HOST_RX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `HOST_TX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `EP0_RX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `EP0_TX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `EP1_RX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `EP1_TX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `EP2_RX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `EP2_TX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `EP3_RX_FIFO_BASE + `FIFO_DATA_REG ||

       address == `EP3_TX_FIFO_BASE + `FIFO_DATA_REG) )

  begin

    ack_o <= ack_delayed & ack_immediate;

  end

  else

  begin

    ack_o <= ack_immediate;

  end

end

endmodule