Subversion Repositories robust_axi2ahb

<##//////////////////////////////////////////////////////////////////

////                                                             ////

////  Author: Eyal Hochberg                                      ////

////          eyal@provartec.com                                 ////

////                                                             ////

////  Downloaded from: http://www.opencores.org                  ////

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

////                                                             ////

//// Copyright (C) 2010 Provartec LTD                            ////

//// www.provartec.com                                           ////

//// info@provartec.com                                          ////

////                                                             ////

//// 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.////

////                                                             ////

//// 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. http://www.gnu.org/licenses/lgpl.html              ////

////                                                             ////

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

OUTFILE PREFIX_cmd.v

INCLUDE def_axi2ahb.txt

module  PREFIX_cmd (PORTS);

   input                  clk;

   input                  reset;

   port                   AWGROUP_AXI_A;

   port                   ARGROUP_AXI_A;

   input                  GROUP_AHB;

   input                  ahb_finish;

   output                 cmd_empty;

   output                 cmd_read;

   output [ID_BITS-1:0]   cmd_id;

   output [ADDR_BITS-1:0] cmd_addr;

   output [3:0]           cmd_len;

   output [1:0]           cmd_size;

   output                 cmd_err;

   wire                   AGROUP_AXI_A;

   wire                   cmd_push;

   wire                   cmd_pop;

   wire                   cmd_empty;

   wire                   cmd_full;

   reg                    read;

   wire                   err;

   wire                   wreq, rreq;

   wire                   wack, rack;

   wire                   AERR;

   assign                 wreq = AWVALID;

   assign                 rreq = ARVALID;

   assign                 wack = AWVALID & AWREADY;

   assign                 rack = ARVALID & ARREADY;

   always @(posedge clk or posedge reset)

     if (reset)

       read <= #FFD 1'b1;

     else if (wreq & (rack | (~rreq)))

       read <= #FFD 1'b0;

     else if (rreq & (wack | (~wreq)))

       read <= #FFD 1'b1;

        //command mux

        assign AGROUP_AXI_A = read ? ARGROUP_AXI_A : AWGROUP_AXI_A;

   assign ARREADY = (~cmd_full) & read;

   assign AWREADY = (~cmd_full) & (~read);

   assign err =

          ((ALEN != 4'd0) &

           (ALEN != 4'd3) &

           (ALEN != 4'd7) &

           (ALEN != 4'd15)) |

          (((ASIZE == 2'b01) & (AADDR[0] != 1'b0)) |

           ((ASIZE == 2'b10) & (AADDR[1:0] != 2'b00)) |

           ((ASIZE == 2'b11) & (AADDR[2:0] != 3'b000)));

    assign                    cmd_push  = AVALID & AREADY;

    assign                    cmd_pop   = ahb_finish;

CREATE prgen_fifo.v DEFCMD(SWAP CONST(#FFD) #FFD)

   prgen_fifo #(ID_BITS+ADDR_BITS+4+2+1+1, CMD_DEPTH)

   cmd_fifo(

            .clk(clk),

            .reset(reset),

            .push(cmd_push),

            .pop(cmd_pop),

            .din({

                  AID,

                  AADDR,

                  ALEN,

                  ASIZE,

                  read,

                  err

                  }

                 ),

            .dout({

                   cmd_id,

                   cmd_addr,

                   cmd_len,

                   cmd_size,

                   cmd_read,

                   cmd_err

                   }

                  ),

            .empty(cmd_empty),

            .full(cmd_full)

            );

endmodule