Subversion Repositories axi4_tlm_bfm

/*

        This file is part of the AXI4 Transactor and Bus Functional Model

        (axi4_tlm_bfm) project:

                http://www.opencores.org/project,axi4_tlm_bfm

        Description

        This implements a generic interface for transactors, and has a set

        of reusable procedures to read and write from / to a bus. This

        interface can be used in many different bus protocols, by means of

        instantiating this package. An example implementation for the AXI4

        protocol can be found at

                pkg-axi-tlm.vhdl

        under the axi4_tlm_bfm project.

        To Do:

        Author(s):

        - Daniel C.K. Kho, daniel.kho@opencores.org | daniel.kho@tauhop.com

        Copyright (C) 2012-2013 Authors and OPENCORES.ORG

        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;

        either version 2.1 of the License, or (at your option) any

        later version.

        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.

        You should have received a copy of the GNU Lesser General

        Public License along with this source; if not, download it

        from http://www.opencores.org/lgpl.shtml.

*/

/* FIXME VHDL-2008 instantiated package. Unsupported by VCS-MX, Quartus, and Vivado. QuestaSim/ModelSim supports well. */

library ieee; use ieee.std_logic_1164.all, ieee.numeric_std.all;

--use std.textio.all;

package tlm is

--      generic(type t_addr; type t_msg; type t_cnt);

        /* TODO remove once generic packages are supported. */

        subtype t_addr is unsigned(31 downto 0);

        subtype t_msg is signed(31 downto 0);

        subtype t_cnt is unsigned(127 downto 0);

        /* BFM control interface. */

        type t_bfm is record

                address:t_addr;

                message:t_msg;

                trigger:boolean;

        end record t_bfm;

        procedure write(

                signal request:inout t_bfm;             --FIXME use inout because Quartus doesn't yet allow reading of "out" within a procedure. VHDL-2008 allows this, and QuestaSim works fine.

                address:in t_addr;                              -- used only for non-stream interfaces.

                data:in t_msg

        );

        procedure read(

                signal request:inout t_bfm;             --FIXME use inout because Quartus doesn't yet allow reading of "out" within a procedure. VHDL-2008 allows this, and QuestaSim works fine.

                address:in t_addr                               -- used only for non-stream interfaces.

        );

end package tlm;

package body tlm is

        procedure write(

                signal request:inout t_bfm;             --FIXME use inout because Quartus doesn't yet allow reading of "out" within a procedure. VHDL-2008 allows this, and QuestaSim works fine.

                address:in t_addr;                              -- used only for non-stream interfaces.

                data:in t_msg

        ) is begin

                request.address<=address;

                request.message<=data;

                request.trigger<=not request.trigger;

        end procedure write;

        procedure read(

                signal request:inout t_bfm;             --FIXME use inout because Quartus doesn't yet allow reading of "out" within a procedure. VHDL-2008 allows this, and QuestaSim works fine.

                address:in t_addr                               -- used only for non-stream interfaces.

        ) is begin

                request.address<=address;

                request.trigger<=not request.trigger;

                --report "request.address: " & to_hstring(request.address);

        end procedure read;

end package body tlm;