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

////                                                              ////

////  OR1200 Parity Checking                                      ////

////                                                              ////

////  This file is part of the OpenRISC 1200 project              ////

////  http://opencores.org/project,or1k                           ////

////                                                              ////

////  Description                                                 ////

////  Parity bit checking, combinatorial. Presumes single bit of  ////

////  parity supplied to check against. Signals error on parity   ////

////  mismatch.                                                   ////

////                                                              ////

////  To Do:                                                      ////

////                                                              ////

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

////      - Julius Baxter,  julius@opencores.org                  ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2011 Authors 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                     ////

////                                                              ////

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

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "or1200_defines.v"

module or1200_parity_chk

  (

   d_i,

   p_i,

   err_o

   );

   // Width of data we check parity for.

   parameter dw = 8;

   input [dw-1:0] d_i; // Data word in

   input          p_i; // Parity bit in

   output         err_o; // Error indicator out

   // Is nice if X's don't propegate through here during simulation, so use

   // !==

   assign err_o = ((^d_i[dw-1:0]) !== p_i);

endmodule // or1200_parity_chk