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//----------------------------------------------------------------------------

// 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, write to the Free Software Foundation,

// Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

//

//----------------------------------------------------------------------------

//

// *File Name: template_periph_16b.v

// 

// *Module Description:

//                       16 bit peripheral template.

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

//----------------------------------------------------------------------------

// $Rev: 17 $

// $LastChangedBy: olivier.girard $

// $LastChangedDate: 2009-08-04 23:15:39 +0200 (Tue, 04 Aug 2009) $

//----------------------------------------------------------------------------

`timescale 1ns / 100ps

module  template_periph_16b (

// OUTPUTs

    per_dout,                       // Peripheral data output

// INPUTs

    mclk,                           // Main system clock

    per_addr,                       // Peripheral address

    per_din,                        // Peripheral data input

    per_en,                         // Peripheral enable (high active)

    per_wen,                        // Peripheral write enable (high active)

    puc                             // Main system reset

);

// OUTPUTs

//=========

output       [15:0] per_dout;       // Peripheral data output

// INPUTs

//=========

input               mclk;           // Main system clock

input         [7:0] per_addr;       // Peripheral address

input        [15:0] per_din;        // Peripheral data input

input               per_en;         // Peripheral enable (high active)

input         [1:0] per_wen;        // Peripheral write enable (high active)

input               puc;            // Main system reset

//=============================================================================

// 1)  PARAMETER DECLARATION

//=============================================================================

// Register addresses

parameter           CNTRL1     = 9'h190;

parameter           CNTRL2     = 9'h192;

parameter           CNTRL3     = 9'h194;

parameter           CNTRL4     = 9'h196;

// Register one-hot decoder

parameter           CNTRL1_D   = (512'h1 << CNTRL1);

parameter           CNTRL2_D   = (512'h1 << CNTRL2);

parameter           CNTRL3_D   = (512'h1 << CNTRL3);

parameter           CNTRL4_D   = (512'h1 << CNTRL4);

//============================================================================

// 2)  REGISTER DECODER

//============================================================================

// Register address decode

reg  [511:0]  reg_dec;

always @(per_addr)

  case ({per_addr,1'b0})

    CNTRL1 :     reg_dec  =  CNTRL1_D;

    CNTRL2 :     reg_dec  =  CNTRL2_D;

    CNTRL3 :     reg_dec  =  CNTRL3_D;

    CNTRL4 :     reg_dec  =  CNTRL4_D;

    default:     reg_dec  =  {512{1'b0}};

  endcase

// Read/Write probes

wire         reg_write =  |per_wen   & per_en;

wire         reg_read  = ~|per_wen   & per_en;

// Read/Write vectors

wire [511:0] reg_wr    = reg_dec & {512{reg_write}};

wire [511:0] reg_rd    = reg_dec & {512{reg_read}};

//============================================================================

// 3) REGISTERS

//============================================================================

// CNTRL1 Register

//-----------------   

reg  [15:0] cntrl1;

wire        cntrl1_wr = reg_wr[CNTRL1];

always @ (posedge mclk or posedge puc)

  if (puc)            cntrl1 <=  16'h0000;

  else if (cntrl1_wr) cntrl1 <=  per_din;

// CNTRL2 Register

//-----------------   

reg  [15:0] cntrl2;

wire        cntrl2_wr = reg_wr[CNTRL2];

always @ (posedge mclk or posedge puc)

  if (puc)            cntrl2 <=  16'h0000;

  else if (cntrl2_wr) cntrl2 <=  per_din;

// CNTRL3 Register

//-----------------   

reg  [15:0] cntrl3;

wire        cntrl3_wr = reg_wr[CNTRL3];

always @ (posedge mclk or posedge puc)

  if (puc)            cntrl3 <=  16'h0000;

  else if (cntrl3_wr) cntrl3 <=  per_din;

// CNTRL4 Register

//-----------------   

reg  [15:0] cntrl4;

wire        cntrl4_wr = reg_wr[CNTRL4];

always @ (posedge mclk or posedge puc)

  if (puc)            cntrl4 <=  16'h0000;

  else if (cntrl4_wr) cntrl4 <=  per_din;

//============================================================================

// 4) DATA OUTPUT GENERATION

//============================================================================

// Data output mux

wire [15:0] cntrl1_rd  = cntrl1  & {16{reg_rd[CNTRL1]}};

wire [15:0] cntrl2_rd  = cntrl2  & {16{reg_rd[CNTRL2]}};

wire [15:0] cntrl3_rd  = cntrl3  & {16{reg_rd[CNTRL3]}};

wire [15:0] cntrl4_rd  = cntrl4  & {16{reg_rd[CNTRL4]}};

wire [15:0] per_dout   =  cntrl1_rd  |

                          cntrl2_rd  |

                          cntrl3_rd  |

                          cntrl4_rd;

endmodule // template_periph_16b