pos_sel.vhd

simple thermometr in vhdl

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-- Company: 
-- Engineer: 
-- 
-- Create Date:    15:18:33 11/23/2007 
-- Design Name: 
-- Module Name:    pos_sel - Behavioral 
-- Project Name: 
-- Target Devices: 
-- Tool versions: 
-- Description: 
--
-- Dependencies: 
--
-- Revision: 
-- Revision 0.01 - File Created
-- Additional Comments: 
--
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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity pos_sel is
    Port ( clk : in  STD_LOGIC;
			  cfr1 : in  STD_LOGIC_VECTOR (3 downto 0);
           cfr2 : in  STD_LOGIC_VECTOR (3 downto 0);
           cfr3 : in  STD_LOGIC_VECTOR (3 downto 0);
			  pixel_add : in STD_LOGIC_VECTOR (9 downto 0);
           decimal : in  STD_LOGIC;
           segno : in  STD_LOGIC;
			  inizio : out STD_LOGIC_VECTOR (9 downto 0);
			  fine : out STD_LOGIC_VECTOR (9 downto 0);
           cifra : out  STD_LOGIC_VECTOR (3 downto 0));
end pos_sel;

architecture Behavioral of pos_sel is

begin
process(clk)
begin
if(clk='1' and clk'event)then
if(conv_integer(pixel_add)< 223)then
inizio <= "0011011111";

end if;
if(conv_integer(pixel_add)>222 and conv_integer(pixel_add)<242)then
inizio <="0011011111";
fine <="0011110010";
if(segno = '1')then
cifra <= "1010";
else
cifra <="1111";
end if;
end if;
if(conv_integer(pixel_add)>244 and conv_integer(pixel_add)<275)then
inizio <="0011110101";
fine <="0100010011";
if(cfr1 ="0001")then
cifra <= "0001";
else
cifra <= "1111";
end if;
end if;
if(conv_integer(pixel_add)>277 and conv_integer(pixel_add)<308)then
inizio <="0100010110";
fine <="0100110100";
if(cfr1 ="0000" and cfr2="0000")then
cifra <="1111";
else
cifra <= cfr2;
end if;
end if;
if(conv_integer(pixel_add)>310 and conv_integer(pixel_add)<341)then
inizio <="0100110111";
fine <="0101010101";
cifra <= cfr3;
end if;
if(conv_integer(pixel_add)>343 and conv_integer(pixel_add)<352)then
inizio <="0101011000";
fine <="0101100000";
cifra <="1011";
end if;
if(conv_integer(pixel_add)>354 and conv_integer(pixel_add)<385)then
inizio <="0101100011";
fine <="0110000001";
if(decimal ='0')then
cifra <="0000";
else
cifra <="0101";
end if;
end if;
if(conv_integer(pixel_add)>387 and conv_integer(pixel_add)<418)then
inizio <="0110000100";
fine <="0110100010";
cifra <="1100";
end if;
if(conv_integer(pixel_add)>417)then
fine <="0110100010";
end if;
end if;
end process;
end Behavioral;