Subversion Repositories dmt_tx

/* *****************************************************************

 *

 *  This file is part of the

 *

 *  Tone Order and Constellation Encoder Core.

 *

 *  Description:

 *

 *  The conste_enc module implements the tone ordering and

 *  constellation encoding as described in ITU G.992.1

 *

 *********************************************************************

 *  Copyright (C) 2007 Guenter Dannoritzer

 *

 *   This source is free software; you can redistribute it

 *   and/or modify it under the terms of the

 *             GNU General Public License

 *   as published by the Free Software Foundation;

 *   either version 3 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 General Public License for more details.

 *

 *   You should have received a copy of the

 *   GNU General Public License along with this source.

 *   If not, see <http://www.gnu.org/licenses/>.

 *

 * *****************************************************************/

module const_encoder(

                clk,

                reset,

                fast_ready_o,

                we_fast_data_i,

                fast_data_i,

                inter_ready_o,

                we_inter_data_i,

                inter_data_i,

                addr_i,

                we_conf_i,

                conf_data_i,

                xy_ready_o,

                carrier_num_o,

                x_o,

                y_o);

`include "parameters.vh"

//

// parameter

// 

input                 clk;

input                 reset;

output                fast_ready_o;

input                 we_fast_data_i;

input   [DW-1:0]      fast_data_i;

output                inter_ready_o;

input                 we_inter_data_i;

input   [DW-1:0]      inter_data_i;

input   [CONFAW-1:0]  addr_i;

input                 we_conf_i;

input   [CONFDW-1:0]  conf_data_i;

output                xy_ready_o;

output  [CNUMW-1:0]   carrier_num_o;

output  [CONSTW-1:0]  x_o;

output  [CONSTW-1:0]  y_o;

//

// local wire/regs

//

wire    [DW-1:0]      fast_data_o;

wire    [DW-1:0]      inter_data_o;

reg   [SHIFTW-1:0]    fast_shift_reg;

reg   [SHIFTW-1:0]    inter_shift_reg;

reg   [MAXBITNUM-1:0] const_input_reg;

reg   [CONFDW-1:0]    BitLoading [0:TABLELEN-1];

reg   [CONFDW-1:0]    CarrierNumber [0:TABLELEN-1];

reg   [USEDCREGW-1:0] UsedCarrier;

reg   [FBITSW-1:0]    FastBits;

//

// intantiate the fast path and interleaved path FIFOs

//

fifo  #(.AWIDTH(AW), .DWIDTH(DW))

      fifo_fast ( .clk(clk),

                  .reset(reset),

                  .empty_o(fast_empty_o),

                  .full_o(fast_full_o),

                  .one_available_o(fast_one_available_o),

                  .two_available_o(fast_two_available_o),

                  .we_i(we_fast_i),

                  .data_i(fast_data_i),

                  .re_i(re_fast_i),

                  .data_o(fast_data_o)

                  );

fifo  #(.AWIDTH(AW), .DWIDTH(DW))

      fifo_inter ( .clk(clk),

                  .reset(reset),

                  .empty_o(inter_empty_o),

                  .full_o(inter_full_o),

                  .one_available_o(inter_one_available_o),

                  .two_available_o(inter_two_available_o),

                  .we_i(we_inter_i),

                  .data_i(inter_data_i),

                  .re_i(re_inter_i),

                  .data_o(inter_data_o)

                  );

//

// configuration register access

//

always @(posedge clk or posedge reset) begin

  if(reset) begin

    UsedCarrier <= 0;

    FastBits <= 0;

  end

  else begin

    UsedCarrier <= 1;

  end

end

endmodule