ROM Inference on an Array (VHDL) - 2024.1 English

Vivado Design Suite User Guide: Synthesis (UG901)

Document ID
Release Date
2024.1 English

Filename: roms_1.vhd

-- ROM Inference on array
-- File: roms_1.vhd
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;

entity roms_1 is
clk : in std_logic;
en : in std_logic;
addr : in std_logic_vector(5 downto 0);
data : out std_logic_vector(19 downto 0)
end roms_1;

architecture behavioral of roms_1 is
type rom_type is array (63 downto 0) of std_logic_vector(19 downto 0);
signal ROM : rom_type := (X"0200A", X"00300", X"08101", X"04000", X"08601", X"0233A",
X"00300", X"08602", X"02310", X"0203B", X"08300", X"04002",
X"08201", X"00500", X"04001", X"02500", X"00340", X"00241", X"04002", X"08300", X"08201", X"00500" X"08101", X"00602", X"04003", X"0241E", X"00301", X"00102", X"02122", X"02021", X"00301", X"00102", X"02222", X"04001", X"00342", X"0232B", X"00900", X"00302", X"00102", X"04002", X"00900", X"08201", X"02023", X"00303", X"02433", X"00301", X"04004" X"00301",X"00102", X"02137", X"02036", X"00301", X"00102", X"02237",X"04004", X"00304", X"04040", X"02500", X"02500", X"02500",X"0030D", X"02341", X"08201", X"0400D");
attribute rom_style : string;
attribute rom_style of ROM : signal is "block";

if rising_edge(clk) then
if (en = '1') then
data <= ROM(conv_integer(addr));
end if;
end if;
end process;

end behavioral;