datapath_pack.vhd

来自「design compile synthesis user guide」· VHDL 代码 · 共 38 行

---------------------------------------------------------------
-- Package for DATAPATH functions and types for
-- RTL Analyzer tutorial design
---------------------------------------------------------------
-- Revision 1.4  1998/06/08  dannyb
-- format
--
-- Revision 1.3  1997/03/06  baldrik
-- package header
--
-- Revision 1.2  1997/02/08  baldrik
-- use UNSIGNED for arithmetic
--
-- Revision 1.1  1997/02/07  baldrik
-- Initial revision
---------------------------------------------------------------

Library IEEE;
use IEEE.Std_Logic_1164.all;

package DATAPATH is

  constant ADDR_width : natural := 16;
  subtype ADDR_TYPE is std_logic_vector(ADDR_width -1 downto 0);

  constant CNT_width : natural := 11;
  subtype CNT_TYPE  is std_logic_vector(CNT_width -1 downto 0);

  constant POINT_width : natural := 8;
  subtype POINT_TYPE is std_logic_vector(POINT_width -1 downto 0);


  function datapath ( POINTER    : in  POINT_TYPE;
                      ADDR       : in  ADDR_TYPE) return
                      CNT_TYPE ;

end DATAPATH;