Scribd
Upload
27 views1 page

ROM (Read Only Memory) Yapısı

The document describes a ROM entity with a 4-bit address input and 8-bit data output. It defines a 16-location memory array that is initialized with specific values. Based on the address input, the appropriate value from the memory array is assigned to the data output.

Uploaded by

Kubilay Ataş
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
27 views1 page

ROM (Read Only Memory) Yapısı

The document describes a ROM entity with a 4-bit address input and 8-bit data output. It defines a 16-location memory array that is initialized with specific values. Based on the address input, the appropriate value from the memory array is assigned to the data output.

Uploaded by

Kubilay Ataş
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 1

ROM (Read Only Memory) Yapısı

library ieee;
use ieee.std_logic_1164.all;

entity ROM is
port ( address : in std_logic_vector(3 downto 0);
data : out std_logic_vector(7 downto 0) );
end entity ROM;

architecture behavioral of ROM is


type mem is array ( 0 to 15) of std_logic_vector(7 downto 0);
constant my_Rom : mem := (
0 => "00000000",
1 => "00000001",
2 => "00000010",
3 => "00000011",
4 => "00000100",
5 => "11110000",
6 => "11110000",
7 => "11110000",
8 => "11110000",
9 => "11110000",
10 => "11110000",
11 => "11110000",
12 => "11110000",
13 => "11110000",
14 => "11110000",
15 => "11110000");
begin
process (address)
begin
case address is
when "0000" => data <= my_rom(0);
when "0001" => data <= my_rom(1);
when "0010" => data <= my_rom(2);
when "0011" => data <= my_rom(3);
when "0100" => data <= my_rom(4);
when "0101" => data <= my_rom(5);
when "0110" => data <= my_rom(6);
when "0111" => data <= my_rom(7);
when "1000" => data <= my_rom(8);
when "1001" => data <= my_rom(9);
when "1010" => data <= my_rom(10);
when "1011" => data <= my_rom(11);
when "1100" => data <= my_rom(12);
when "1101" => data <= my_rom(13);
when "1110" => data <= my_rom(14);
when "1111" => data <= my_rom(15);
when others => data <= "00000000";
end case;
end process;
end architecture behavioral;

You might also like