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i8244_pack-p.vhd
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i8244_pack-p.vhd
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-------------------------------------------------------------------------------
--
-- i8244 Video Display Controller
--
-- $Id: i8244_pack-p.vhd,v 1.9 2007/02/05 22:08:59 arnim Exp $
--
-- Copyright (c) 2007, Arnim Laeuger (arnim.laeuger@gmx.net)
--
-- All rights reserved
--
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package i8244_pack is
subtype byte_t is std_logic_vector(7 downto 0);
type byte_array_t is array (natural range <>) of byte_t;
subtype pos_t is unsigned(8 downto 0);
function to_pos_f(int : in natural) return pos_t;
function to_stdlogic(a : in boolean) return std_logic;
constant is_ntsc_c : integer := 0;
constant is_pal_c : integer := 1;
subtype col_attr_t is std_logic_vector(2 downto 0);
type col_attrs_t is array (natural range <>) of col_attr_t;
end i8244_pack;
package body i8244_pack is
function to_pos_f(int : in natural) return pos_t is
variable result_v : pos_t;
begin
result_v := to_unsigned(int, pos_t'length);
return result_v;
end;
function to_stdlogic(a : in boolean) return std_logic is
begin
if a then
return '1';
else
return '0';
end if;
end;
end i8244_pack;