keyboard.vhd

VHDL源代码下载

--keyboard.vhd keyboard scanner
library ieee ;
use ieee.std_logic_1164.all;
use work.components.all ;
entity keyboard is
port(
  clock : in std_logic ;
  col : in std_logic_vector(3 downto 0 ) ;
  row : out std_logic_vector(3 downto 0) ;
  scan_f : out std_logic ;
  key_valid : out std_logic ;
  butt_code : out std_logic_vector(3 downto 0)) ;
end keyboard;
architecture behavior of keyboard is
  signal scanf : std_logic ;
  signal key_pressed : std_logic ;
  signal scan_cnt : std_logic_vector(3 downto 0) ;
begin 
  divfreq: scan_gen
  generic map ( osc_f => 3686 , osc_bit => 12 )
    port map ( clock, scanf ) ;
  keycount: scan_count 
	port map ( clock, scanf, key_pressed, scan_cnt ) ;
  keyscan: key_scan 
	port map ( col, scan_cnt, row, key_pressed ) ;
  debounkey: debounce 
	port map ( key_pressed, clock, scanf, key_valid ) ;
  coding: code_tran 
	port map ( scan_cnt, clock, butt_code ) ;
  scan_f <= scanf ;
end behavior;