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[/] [graphicsaccelerator/] [trunk/] [FrameBuffer2.vhd] - Blame information for rev 2
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OmarMokhta |
library IEEE;
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use IEEE.STD_LOGIC_1164.ALL;
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use IEEE.NUMERIC_STD.ALL;
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use IEEE.std_logic_unsigned.all;
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use IEEE.STD_LOGIC_ARITH.ALL;
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entity FrameBuffer is
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Port ( inX : in STD_LOGIC_VECTOR (9 downto 0);
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inY : in STD_LOGIC_VECTOR (8 downto 0);
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outX : in STD_LOGIC_VECTOR (9 downto 0);
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outY : in STD_LOGIC_VECTOR (8 downto 0);
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outColor : out STD_LOGIC_VECTOR (2 downto 0);
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inColor : in STD_LOGIC_VECTOR (2 downto 0);
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BufferWrite : in STD_LOGIC;
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Clk : in STD_LOGIC);
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end FrameBuffer;
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architecture Behavioral of FrameBuffer is
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type FBuffer is array (0 to 524288/16-1) of std_logic_vector (2 downto 0);
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impure function initFB return FBuffer is
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variable temp : FBuffer;
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variable i : integer;
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begin
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for i in 0 to 524288/16-1 loop
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temp(i) := "000";
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end loop;
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return temp;
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end initFB;
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signal mybuffer : FBuffer := initFB;
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signal addressWrite,addressRead : STD_LOGIC_VECTOR (14 downto 0);
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signal temp : STD_LOGIC_VECTOR (2 downto 0);
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begin
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addressWrite <= inX(9 downto 2) & inY(8 downto 2);
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addressRead <= outX(9 downto 2) & outY(8 downto 2);
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outColor <= temp;
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process (clk) begin
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if (rising_edge(Clk)) then
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if (BufferWrite = '1') then
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mybuffer(conv_integer(addressWrite)) <= inColor;
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end if;
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temp <= mybuffer(conv_integer(addressRead));
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end if;
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end process;
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end Behavioral;
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