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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//////////////////////////////////////////////////////////////////##>

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