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

////                                                              ////

////  MP3 demo WISHBONE i/f of Audio block                        ////

////                                                              ////

////  This file is part of the MP3 demo application               ////

////  http://www.opencores.org/cores/or1k/mp3/                    ////

////                                                              ////

////  Description                                                 ////

////  Connect the audio block to the WISHBONE bus.                ////

////                                                              ////

////  To Do:                                                      ////

////   - nothing really                                           ////

////                                                              ////

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

////      - Lior Shtram, lior.shtram@flextronicssemi.com          ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2001 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: not supported by cvs2svn $

// Revision 1.1.1.1  2001/11/04 19:00:08  lampret

// First import.

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

module audio_wb_if (

        rstn,

        clk,

        wb_dat_i,

        wb_dat_o,

        wb_adr_i,

        wb_sel_i,

        wb_we_i,

        wb_cyc_i,

        wb_stb_i,

        wb_ack_o,

        wb_err_o,

        fifo_dat_o,

        fifo_clk_o,

        fifo_wr_en,

        fifo_full,

        fifo_empty,

        fifo_almost_full,

        fifo_almost_empty

);

parameter fifo_width = 16;

input           rstn;

input           clk;

input [31:0]     wb_dat_i;

output [31:0]    wb_dat_o;

input [31:0]     wb_adr_i;

input [3:0]      wb_sel_i;

input           wb_we_i;

input           wb_cyc_i;

input           wb_stb_i;

output          wb_ack_o;

output          wb_err_o;

output [fifo_width-1:0]  fifo_dat_o;

output          fifo_clk_o;

output          fifo_wr_en;

input           fifo_full;

input           fifo_empty;

input           fifo_almost_full;

input           fifo_almost_empty;

reg [3:0]        fifo_status;

reg             f_wr_en;

always @(posedge clk or negedge rstn)

if (!rstn) fifo_status <= 4'b0;

else

   fifo_status <= #1 { fifo_full, fifo_empty,

                        fifo_almost_full, fifo_almost_empty };

assign fifo_dat_o = wb_dat_i[fifo_width-1:0];

assign wb_dat_o = { 28'b0, fifo_status };

//assign wb_ack_o = wb_cyc_i & !fifo_almost_full;

assign wb_err_o = 1'b0;

assign fifo_clk_o = clk;

always @(posedge clk or negedge rstn)

begin

  if(!rstn)

    f_wr_en <= 1'b0;

  else

  if(wb_cyc_i & wb_we_i & !fifo_almost_full & ~f_wr_en)

    f_wr_en  <= #1 1'b1;

        else

          f_wr_en <= #1 1'b0;

end

assign fifo_wr_en = f_wr_en;

//assign wb_ack_o = f_wr_en;

assign wb_ack_o = f_wr_en | (wb_cyc_i & wb_stb_i & ~wb_we_i);

endmodule