Subversion Repositories mem_ctrl

/////////////////////////////////////////////////////////////////////
////                                                             ////
////  WISHBONE Memory Controller                                 ////
////  Parametarized, Pipelined Incrementer                       ////
////                                                             ////
////                                                             ////
////  Author: Rudolf Usselmann                                   ////
////          rudi@asics.ws                                      ////
////                                                             ////
////                                                             ////
////  Downloaded from: http://www.opencores.org/cores/mem_ctrl/  ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Copyright (C) 2000-2002 Rudolf Usselmann                    ////
////                         www.asics.ws                        ////
////                         rudi@asics.ws                       ////
////                                                             ////
//// 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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     ////
//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   ////
//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   ////
//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      ////
//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         ////
//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    ////
//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   ////
//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        ////
//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  ////
//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  ////
//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  ////
//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         ////
//// POSSIBILITY OF SUCH DAMAGE.                                 ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
 
//  CVS Log
//
//  $Id: mc_incn_r.v,v 1.2 2002-01-21 13:08:52 rudi Exp $
//
//  $Date: 2002-01-21 13:08:52 $
//  $Revision: 1.2 $
//  $Author: rudi $
//  $Locker:  $
//  $State: Exp $
//
// Change History:
//               $Log: not supported by cvs2svn $
//               Revision 1.1  2001/07/29 07:34:41  rudi
//
//
//               1) Changed Directory Structure
//               2) Fixed several minor bugs
//
//               Revision 1.1  2001/06/12 15:18:47  rudi
//
//
//               This is a pipelined primitive incrementor.
//
//
//
//
//
 
`include "mc_defines.v"
 
//
// USAGE: incN_r #(<WIDTH>) uN(clk, input, output);
//
module mc_incn_r(clk, inc_in, inc_out);
 
parameter	incN_width = 32;
 
input		clk;
input	[incN_width-1:0]	inc_in;
output	[incN_width-1:0]	inc_out;
 
parameter	incN_center = incN_width / 2;
 
reg	[incN_center:0]		out_r;
wire	[31:0]			tmp_zeros = 32'h0;
wire	[incN_center-1:0]	inc_next;
 
always @(posedge clk)
	out_r <= #1 inc_in[incN_center - 1:0] + {tmp_zeros[incN_center-2:0], 1'h1};
 
assign inc_out[incN_width-1:incN_center] = inc_in[incN_width-1:incN_center] + inc_next;
 
assign inc_next = out_r[incN_center] ?
			{tmp_zeros[incN_center-2:0], 1'h1} : tmp_zeros[incN_center-2:0];
 
assign inc_out[incN_center-1:0]  = out_r;
 
endmodule