uart.vhd.bak

-- uart.vhd: UART controller - receiving part
-- Author(s): xsnope04
--
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
-------------------------------------------------
entity UART_RX is
port(	
    CLK: 	    in std_logic;
	RST: 	    in std_logic;
	DIN: 	    in std_logic;
	DOUT: 	    out std_logic_vector(7 downto 0);
	DOUT_VLD: 	out std_logic := '0'
);
end UART_RX;  

-------------------------------------------------
architecture behavioral of UART_RX is

signal cnt : std_logic_vector(4 downto 0);
signal cnt2 : std_logic_vector(3 downto 0);
signal cn_en : std_logic;
signal data : std_logic;
signal dout_v : std_logic;


begin
  FSM : entity work.UART_FSM(behavioral)
  port map(
    CLK       => CLK,
    RST       => RST,
    DIN       => DIN,
    COUNTER       => cnt,
    COUNTER2  =>cnt2,
    DATA      => data,
    CN_EN    => cn_en,
    VALID     => dout_v
  );
    
  DOUT_VLD <= dout_v;  
  process (CLK) begin
    if rising_edge (CLK) then
      
      if RST = '1' then
        cnt <= "00000";
        cnt2 <= "0000";
        
       else
        if cn_en = '1' then
          cnt <= cnt+1;
          
        elsif cnt2(3) = '1' then
          cnt <= "00000";
          cnt2 <= "0000";
        end if;
        
        if data = '1' and cnt(4) = '1' then
          cnt <= "00000";
          
          if cnt2 = "0000" then
            DOUT(0) <= DIN;
            
          elsif cnt2 = "0001" then
            DOUT(1) <= DIN;
            
          elsif cnt2 = "0010" then
            DOUT(2) <= DIN;
            
          elsif cnt2 = "0011" then
            DOUT(3) <= DIN;
            
          elsif cnt2 = "0100" then
            DOUT(4) <= DIN;
            
          elsif cnt2 = "0101" then
            DOUT(5) <= DIN;
            
          elsif cnt2 = "0110" then
            DOUT(6) <= DIN;
            
          elsif cnt2 = "0111" then
            DOUT(7) <= DIN;
          end if;
          cnt2 <= cnt2 +1;
          
        elsif data = '0' then
          cnt2 <= "0000";
        end if;
      end if;
    end if;  
  end process;
end behavioral;