Subversion Repositories robust_axi2apb

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

////                                                             ////

////  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        ////

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//// removed from the file and that any derivative work contains ////

//// the original copyright notice and the associated disclaimer.////

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//// 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.////

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//// 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              ////

////                                                             ////

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

INCLUDE def_axi2apb.txt

OUTFILE PREFIX_axi2apb_cmd.v

module  PREFIX_axi2apb_cmd (PORTS);

   input                          clk;

   input                          reset;

   port                   AWGROUP_APB_AXI_A;

   port                   ARGROUP_APB_AXI_A;

   input                  finish_wr;

   input                  finish_rd;

   output                 cmd_empty;

   output                 cmd_read;

   output [ID_BITS-1:0]   cmd_id;

   output [ADDR_BITS-1:0] cmd_addr;

   output                 cmd_err;

   wire                   AGROUP_APB_AXI_A;

   wire                   cmd_push;

   wire                   cmd_pop;

   reg                    read;

   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_APB_AXI_A = read ? ARGROUP_APB_AXI_A : AWGROUP_APB_AXI_A;

        assign AERR   = (ASIZE != 'd2) | (ALEN != 'd0); //support only 32 bit single AXI commands

   assign ARREADY = (~cmd_full) & read;

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

    assign                    cmd_push  = AVALID & AREADY;

    assign                    cmd_pop   = cmd_read ? finish_rd : finish_wr;

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

   prgen_fifo #(ID_BITS+ADDR_BITS+2, CMD_DEPTH)

   cmd_fifo(

            .clk(clk),

            .reset(reset),

            .push(cmd_push),

            .pop(cmd_pop),

            .din({

                        AID,

                        AADDR,

                        AERR,

                        read

                        }

                 ),

            .dout({

                        cmd_id,

                        cmd_addr,

                        cmd_err,

                        cmd_read

                        }

                  ),

            .empty(cmd_empty),

            .full(cmd_full)

            );

endmodule