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[/] [System09/] [trunk/] [rtl/] [VHDL/] [SevenSegmentDisplay.vhd] - Rev 159
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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 lines to use the declarations that are -- provided for instantiating Xilinx primitive components. --library UNISIM; --use UNISIM.VComponents.all; entity SevenSegmentDisplay is Port ( Clk : in std_logic; Reset : in std_logic; Value0 : in std_logic_vector(3 downto 0); Value1 : in std_logic_vector(3 downto 0); Value2 : in std_logic_vector(3 downto 0); Value3 : in std_logic_vector(3 downto 0); DPs : in std_logic_vector(3 downto 0); Blanks : in std_logic_vector(3 downto 0); DigitSelect : out std_logic_vector(3 downto 0); Segments : out std_logic_vector(7 downto 0)); end SevenSegmentDisplay; architecture Behavioral of SevenSegmentDisplay is signal ClockDivider : std_logic_vector(13 downto 0); signal WhichDigit : std_logic_vector(1 downto 0); signal Result : std_logic_vector(7 downto 0); signal DigitValue : std_logic_vector(3 downto 0); signal DP : std_logic; signal Blank : std_logic; component DecoderDriver port( DigitValue : in std_logic_vector(3 downto 0); DP : in std_logic; Blank : in std_logic; Segments : out std_logic_vector(7 downto 0)); end component; begin process(Reset,Clk) is begin if Reset = '1' then ClockDivider <= (others => '0'); WhichDigit <= "00"; DigitSelect <= "1111"; elsif Clk = '1' and Clk'Event then if ClockDivider = "11000011010011" then ClockDivider <= (others => '0'); Segments <= Result; case WhichDigit is -- note that everything is pipelined when "00" => DigitSelect <= "1110"; DigitValue <= Value1; DP <= DPs(1); Blank <= Blanks(1); when "01" => DigitSelect <= "1101"; DigitValue <= Value2; DP <= DPs(2); Blank <= Blanks(2); when "10" => DigitSelect <= "1011"; DigitValue <= Value3; DP <= DPs(3); Blank <= Blanks(3); when "11" => DigitSelect <= "0111"; DigitValue <= Value0; DP <= DPs(0); Blank <= Blanks(0); when others => null; end case; WhichDigit <= WhichDigit + 1; else ClockDivider <= ClockDivider + 1; end if; end if; end process; Inst_DecoderDriver: DecoderDriver PORT MAP ( DigitValue => DigitValue, DP => DP, Blank => Blank, Segments => Result ); end Behavioral;
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