ファイル名: ram_tdp_rf_rf.vhd
-- Dual-Port Block RAM with Two Write Ports
-- Correct Modelization with a Shared Variable
-- File: rams_tdp_rf_rf.vhd
library IEEE;
use IEEE.std_logic_1164.all;
use ieee.numeric_std.all;
entity rams_tdp_rf_rf is
port(
clka : in std_logic;
clkb : in std_logic;
ena : in std_logic;
enb : in std_logic;
wea : in std_logic;
web : in std_logic;
addra : in std_logic_vector(9 downto 0);
addrb : in std_logic_vector(9 downto 0);
dia : in std_logic_vector(15 downto 0);
dib : in std_logic_vector(15 downto 0);
doa : out std_logic_vector(15 downto 0);
dob : out std_logic_vector(15 downto 0)
);
end rams_tdp_rf_rf;
architecture syn of rams_tdp_rf_rf is
type ram_type is array (1023 downto 0) of std_logic_vector(15 downto 0);
shared variable RAM : ram_type;
begin
process(CLKA)
begin
if CLKA’event and CLKA = ‘1’ then
if ENA = ‘1’ then
DOA <= RAM(to_integer(unsigned(ADDRA)));
if WEA = ‘1’ then
RAM(to_integer(unsigned(ADDRA))) := DIA;
end if;
end if;
end if;
end process;
process(CLKB)
begin
if CLKB’event and CLKB = ‘1’ then
if ENB = ‘1’ then
DOB <= RAM(to_integer(unsigned(ADDRB)));
if WEB = ‘1’ then
RAM(to_integer(unsigned(ADDRB))) := DIB;
end if;
end if;
end if;
end process;
end syn;