waveform_pkg.vhd

VHDL小程序（本人的一些小成绩哦

Library IEEE ;
use IEEE.std_logic_1164.all ;
use IEEE.std_logic_arith.all ;

package waveform_pkg is
  constant rom_width : integer := 6 ;
  subtype  rom_word  is std_logic_vector ( 1 to rom_width) ;
  subtype  rom_range is integer range 0 to 12 ;
  type     rom_table is array ( 0 to 12) of rom_word ;
  constant rom_data : rom_table := rom_table'(
                        "111010" ,
                        "101000" ,
                        "011000" ,
                        "001000" ,
                        "011010" ,
                        "010011" ,
                        "101110" ,
                        "110100" ,
                        "001010" ,
                        "001000" ,
                        "010110" ,
                        "010101" ,
                        "001111" ) ;
  subtype  data_word is integer range 0 to 100 ;
  subtype  data_range is integer range 0 to 12 ;
  type     data_table is array (0 to 12) of data_word ;
  constant data : data_table := data_table'(1,40,9,2,2,4,1,15,5,1,1,3,1) ;
end waveform_pkg ;