Filename: rams_sp_nc.v
// Single-Port Block RAM No-Change Mode
// File: rams_sp_nc.v
module rams_sp_nc (clk, we, en, addr, di, dout);
input clk;
input we;
input en;
input [9:0] addr;
input [15:0] di;
output [15:0] dout;
reg [15:0] RAM [1023:0];
reg [15:0] dout;
always @(posedge clk)
begin
if (en)
begin
if (we)
RAM[addr] <= di;
else
dout <= RAM[addr];
end
end
endmodule
Single-Port Block RAM No-Change Mode (VHDL)
-- Single-Port Block RAM No-Change Mode
-- File: rams_sp_nc.vhd
--
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity rams_sp_nc is
port(
clk : in std_logic;
we : in std_logic;
en : in std_logic;
addr : in std_logic_vector(9 downto 0);
di : in std_logic_vector(15 downto 0);
do : out std_logic_vector(15 downto 0)
);
end rams_sp_nc;
architecture syn of rams_sp_nc is
type ram_type is array (1023 downto 0) of std_logic_vector(15 downto 0);
signal RAM : ram_type;
begin
process(clk)
begin
if clk'event and clk = '1' then
if en = '1' then
if we = '1' then
RAM(to_integer(unsigned(addr))) <= di;
else
do <= RAM(to_integer(unsigned(addr)));
end if;
end if;
end if;
end process;
end syn;