?? 10110101
字號:
library IEEE;
use IEEE.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity count8 is
port (
r: in std_logic;
clk: in STD_LOGIC;
cout: out std_logic
);
end count8;
architecture count8_arch of count8 is
signal dd: std_logic_vector ( 2 downto 0 );
begin
count: process ( r,clk )
begin
if ( r='1' ) then dd<="000";
elsif( clk'event and clk = '1') then
dd <= dd + '1';
end if ;
end process count ;
with dd select
cout<='1'when"000",
'0'when"001",
'1'when"010",
'1'when"011",
'0'when"100",
'1'when"101",
'0'when"110",
'1'when"111",
'0'when others ;
end count8_arch;
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