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--------------------------------------------------------------------------------
-- PICT MEM
-- Anders Nilsson
-- 16-feb-2016
-- Version 1.1
-- library declaration
library IEEE;
use IEEE.STD_LOGIC_1164.ALL; -- basic IEEE library
use IEEE.NUMERIC_STD.ALL; -- IEEE library for the unsigned type
-- entity
entity PICT_MEM is
port ( clk : in std_logic;
-- port 1
we1 : in std_logic;
data_in1 : in std_logic_vector(7 downto 0);
data_out1 : out std_logic_vector(7 downto 0);
addr1 : in unsigned(10 downto 0);
-- port 2
we2 : in std_logic;
data_in2 : in std_logic_vector(7 downto 0);
data_out2 : out std_logic_vector(7 downto 0);
addr2 : in unsigned(10 downto 0));
end PICT_MEM;
-- architecture
architecture Behavioral of PICT_MEM is
-- picture memory type
type ram_t is array (0 to 2047) of std_logic_vector(7 downto 0);
-- initiate picture memory to one cursor ("1F") followed by spaces ("00")
signal pictMem : ram_t := (0 => x"1F", others => (others => '0'));
begin
process(clk)
begin
if rising_edge(clk) then
if (we1 = '1') then
pictMem(to_integer(addr1)) <= data_in1;
end if;
data_out1 <= pictMem(to_integer(addr1));
if (we2 = '1') then
pictMem(to_integer(addr2)) <= data_in2;
end if;
data_out2 <= pictMem(to_integer(addr2));
end if;
end process;
end Behavioral;
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