Subversion Repositories i2s_interface

----------------------------------------------------------------------
----                                                              ----
---- WISHBONE I2S Interface IP Core                               ----
----                                                              ----
---- This file is part of the I2S Interface project               ----
---- http://www.opencores.org/cores/i2s_interface/                ----
----                                                              ----
---- Description                                                  ----
---- I2S transmitter/receiver version register.                   ----
----                                                              ----
----                                                              ----
---- To Do:                                                       ----
---- -                                                            ----
----                                                              ----
---- Author(s):                                                   ----
---- - Geir Drange, gedra@opencores.org                           ----
----                                                              ----
----------------------------------------------------------------------
----                                                              ----
---- Copyright (C) 2004 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 General          ----
---- Public License as published by the Free Software Foundation; ----
---- either version 2.0 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 General Public License for more details.----
----                                                              ----
---- You should have received a copy of the GNU General           ----
---- Public License along with this source; if not, download it   ----
---- from http://www.gnu.org/licenses/gpl.txt                     ----
----                                                              ----
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--
-- CVS Revision History
--
-- $Log: not supported by cvs2svn $
-- Revision 1.2  2004/08/06 18:55:43  gedra
-- De-linting.
--
-- Revision 1.1  2004/08/03 18:49:03  gedra
-- Version register.
--
--
--
 
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
 
entity i2s_version is
   generic (DATA_WIDTH : integer;
            ADDR_WIDTH : integer;
            IS_MASTER  : integer);
   port (
      ver_rd   : in  std_logic;         -- version register read
      ver_dout : out std_logic_vector(DATA_WIDTH - 1 downto 0));  -- reg. contents
end i2s_version;
 
architecture rtl of i2s_version is
 
   signal version : std_logic_vector(DATA_WIDTH - 1 downto 0);
 
begin
   ver_dout <= version when ver_rd = '1' else (others => '0');
 
   -- version vector generation
   version(3 downto 0) <= "0001";       -- version 1
   G32 : if DATA_WIDTH = 32 generate
      version(4)            <= '1';
      version(31 downto 16) <= (others => '0');
   end generate G32;
   G16 : if DATA_WIDTH = 16 generate
      version(4) <= '0';
   end generate G16;
   version(15 downto 13) <= (others => '0');
   version(12 downto 6)  <= std_logic_vector(to_unsigned(ADDR_WIDTH, 7));
   version(5)            <= '1' when IS_MASTER = 1 else '0';
 
end rtl;