----------------------------------------------------------------------------------
-- Company:  INSA-Toulouse
-- Engineer: Paul Faure
-- 
-- Create Date: 16.04.2021 14:35:04
-- Module Name: MemoireInstructions - Behavioral
-- Project Name: Processeur sécurisé
-- Target Devices: Basys 3 ARTIX7
-- Tool Versions: Vivado 2016.4
--
-- Description: Memoire d'instruction
--     - Accessible en lecture uniquement
-- 
-- Dependencies: None
--
-- Comments : Memoire circulaire, si l'adresse est utilisée modulo la taille de la mémoire
----------------------------------------------------------------------------------


library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;

entity MemoireInstructions is
    Generic (Nb_bits : Natural; -- Taille d'une instruction en mémoire (Taille d'un code instruction + 3*Taille d'un mot binaire)
             Addr_size : Natural; -- Nombre de bits pour adresser la mémoire
             Mem_size : Natural); -- Taille de la mémoire (nombre d'instructions stockées)
    Port ( Addr : in STD_LOGIC_VECTOR (Addr_size-1 downto 0); -- Une adresse
           D_OUT : out STD_LOGIC_VECTOR (Nb_bits-1 downto 0) := (others => '0')); -- L'instruction presente a cette adresse
end MemoireInstructions;

architecture Behavioral of MemoireInstructions is
    -- Do not touch until (-- Skadoosh)
    -- Do not add any Skadoosh
    signal MEMORY : STD_LOGIC_VECTOR ((Mem_Size * Nb_bits)-1 downto 0) := "0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010101000000000000000000000000100010000000000000000000000000101000000000000010100000000010011000111000000101000000000010110000101100000000000000000100100000000000010100000000001110000010100000001100000000010010000001100000000000000001010100000011000000000000000001111011100110000000000000000010000000001000000010000000000000100000010000000100000000001001000000000000000100000000010000000001000000010000000001010100000001000000000000000010001000000100000000000000000010010000001001010101000000001010100000001000000000000000010001000000100000000000000000010010000001010101010000000001000010000001000000000000000000011000000110000001100000010010010000001100000000000000000010100000010000000100000000001001000000000000010100000000010000000001000000010000000000100000000010000000100000000001001000000100000000000000000011110101011000000000000000000100000000010000000100000000000001000000100000001000000000010010000000000000001000000000100000000010000000100000000001010000000100000101000000000011010000000000000001000000000101000000001000011000000000001010000000000000101100000000100110000000100001100000000000101100001101000000110000000001011000011000000001000000000010110000101100000001000000000101100001010000000000000000000001000000100000000100000010010100000000100001011000000000001000000010000000110000001001001000000110000000100000000010000000001000000000000000000111000001011000000110000000001001000000110000000000000000100000110111000000000000000000001100000011000000110000000101001000000110000000000000000001010000000100000001000000100100100000010000010100000000001000000000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    -- Skadoosh
begin
    D_OUT <= MEMORY (((to_integer(unsigned(Addr)) + 1) * Nb_bits) - 1 downto Nb_bits * to_integer(unsigned(Addr)));
end Behavioral;