Subversion Repositories robust_ahb_matrix

<##//////////////////////////////////////////////////////////////////
////                                                             ////
////  Author: Eyal Hochberg                                      ////
////          eyal@provartec.com                                 ////
////                                                             ////
////  Downloaded from: http://www.opencores.org                  ////
/////////////////////////////////////////////////////////////////////
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//// Copyright (C) 2010 Provartec LTD                            ////
//// www.provartec.com                                           ////
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//// PURPOSE.  See the GNU Lesser General Public License for more////
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//////////////////////////////////////////////////////////////////##>
 
OUTFILE PREFIX_hlast.v
INCLUDE def_ahb_matrix.txt
 
ITER MX   
 
module PREFIX_hlast (PORTS);
 
   input                      clk;
   input                      reset;
 
   input [1:0] 		      MMX_HTRANS;
   input  		      MMX_HREADY;
   input [2:0] 		      MMX_HBURST;
   output                     MMX_HLAST;
 
 
   parameter                  TRANS_IDLE   = 2'b00;
   parameter                  TRANS_BUSY   = 2'b01;
   parameter                  TRANS_NONSEQ = 2'b10;
   parameter                  TRANS_SEQ    = 2'b11;
 
   parameter                  BURST_SINGLE = 3'b000;
   parameter                  BURST_INCR4  = 3'b011;
   parameter                  BURST_INCR8  = 3'b101;
   parameter                  BURST_INCR16 = 3'b111;
 
 
   reg [3:0]                  MMX_count;
 
 
   assign                     MMX_HLAST = (MMX_count == 'd1) | ((MMX_HTRANS == TRANS_NONSEQ) & MMX_HREADY & (MMX_HBURST == BURST_SINGLE));
 
LOOP MX
   always @(posedge clk or posedge reset)
     if (reset)
       MMX_count <= #FFD 4'd15;
     else if ((MMX_HTRANS == TRANS_NONSEQ) & MMX_HREADY)
       MMX_count <= #FFD 
                          (MMX_HBURST == BURST_INCR4) ? 4'd3 :
                          (MMX_HBURST == BURST_INCR8) ? 4'd7 :
                          (MMX_HBURST == BURST_INCR16) ? 4'd15 :
                          4'd0;
     else if ((MMX_HTRANS == TRANS_SEQ) & MMX_HREADY)
       MMX_count <= #FFD MMX_count - 1'b1;
 
ENDLOOP MX
 
 
     endmodule