projet-fpga/Registre_DCC.vhd

46 lines
851 B
VHDL

library ieee;
use ieee.std_logic_1164.all;
entity registre_dcc is
port(
trame_dcc : in std_logic_vector(50 downto 0);
clk : in std_logic;
reset : in std_logic;
shift : in std_logic;
load : in std_logic;
sout : out std_logic
);
end registre_dcc;
architecture behaviour of registre_dcc is
signal sr : std_logic_vector(50 downto 0);
signal lc_shift : std_logic := '0';
begin
process(clk, reset, shift)
begin
if reset = '1' then
sr <= ( others => '0' );
elsif rising_edge(clk) then
if load = '1' then
sr <= trame_dcc;
elsif shift = '1' and lc_shift = '0' then
sr <= sr(49 downto 0) & '0';
lc_shift <= '1';
elsif shift = '0' then
lc_shift <= '0';
end if;
end if;
end process;
sout <= sr(50); --sr pas initialisé par défaut
end behaviour;