Subversion Repositories axi_slave

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

////                                                             ////

////  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_fifo.v

INCLUDE def_axi_slave.txt

module PREFIX_cmd_fifo (PORTS);

   parameter                  DEPTH = 8;

   parameter                  DEPTH_BITS =

                              (DEPTH <= 2)   ? 1 :

                              (DEPTH <= 4)   ? 2 :

                              (DEPTH <= 8)   ? 3 :

                              (DEPTH <= 16)  ? 4 :

                              (DEPTH <= 32)  ? 5 :

                              (DEPTH <= 64)  ? 6 :

                              (DEPTH <= 128) ? 7 :

                              (DEPTH <= 256) ? 8 :

                              (DEPTH <= 512) ? 9 : 0; //0 is ilegal

   input                      clk;

   input                      reset;

   input [ADDR_BITS-1:0]      AADDR;

   input [ID_BITS-1:0]         AID;

   input [SIZE_BITS-1:0]      ASIZE;

   input [LEN_BITS-1:0]       ALEN;

   input                      AVALID;

   input                      AREADY;

   input                      VALID;

   input                      READY;

   input                      LAST;

   output [ADDR_BITS-1:0]     cmd_addr;

   output [ID_BITS-1:0]       cmd_id;

   output [SIZE_BITS-1:0]     cmd_size;

   output [LEN_BITS-1:0]      cmd_len;

   output [1:0]        cmd_resp;

   output                     cmd_timeout;

   output                     cmd_ready;

   output                     cmd_empty;

   output                     cmd_full;

   wire                       push;

   wire                       pop;

   wire                       empty;

   wire                       full;

   wire [DEPTH_BITS:0]        fullness;

   wire [1:0]                  resp_in;

   wire                       timeout_in;

   wire                       timeout_out;

   reg [ADDR_BITS-1:0]         SLVERR_addr = {ADDR_BITS{1'b1}};

   reg [ADDR_BITS-1:0]         DECERR_addr = {ADDR_BITS{1'b1}};

   reg [ADDR_BITS-1:0]         TIMEOUT_addr = {ADDR_BITS{1'b1}};

   parameter                  RESP_SLVERR = 2'b10;

   parameter                  RESP_DECERR = 2'b11;

   assign                     resp_in =

                              push & (SLVERR_addr == AADDR) ? RESP_SLVERR :

                              push & (DECERR_addr == AADDR) ? RESP_DECERR : 2'b00;

   assign                     timeout_in  = push & (TIMEOUT_addr == AADDR);

   assign                     cmd_timeout = timeout_out & (TIMEOUT_addr != 0);

   assign                     cmd_full   = full | (DEPTH == fullness);

   assign                     cmd_empty  = empty;

   assign                     cmd_ready  = ~empty;

   assign                     push = AVALID & AREADY;

   assign                     pop  = VALID & READY & LAST;

CREATE prgen_fifo.v DEFCMD(DEFINE STUB)

   prgen_fifo_stub #(ADDR_BITS+ID_BITS+SIZE_BITS+LEN_BITS+2+1, DEPTH)

   cmd_fifo(

            .clk(clk),

            .reset(reset),

            .push(push),

            .pop(pop),

            .din({AADDR,

                  AID,

                  ASIZE,

                  ALEN,

                  resp_in,

                  timeout_in

                  }

                 ),

            .dout({cmd_addr,

                   cmd_id,

                   cmd_size,

                   cmd_len,

                   cmd_resp,

                   timeout_out

                   }

                  ),

            .fullness(fullness),

            .empty(empty),

            .full(full)

            );

endmodule