Ram and Rom

[Altera_Forum]

I have this Wrong Messages.:confused: 

 library ieee;  use ieee.std_logic_1164.all;  use ieee.numeric_std.all; entity BUS_VHDL is   port  (   CS_ROM_n : out std_logic;  CS_OUT_LED_n : out std_logic;  bus_en_n : in std_logic; <<wrong---- Error (12014): Net "gdfx_temp0", which fans out to "BUS_VHDL:inst4|bus_en_n", cannot be assigned more than one value ----   Addr_bus : in std_logic_vector(7 downto 0)  );  End entity;  architecture rtl of BUS_VHDL is  Begin  process(Addr_bus, bus_en_n)  begin  if bus_en_n = '0' then  if unsigned(addr_bus) > 0 AND unsigned(addr_bus) < 16 then -- ROM adress  CS_ROM_n <= '0';  else  CS_ROM_n <= '1';  end if;  if addr_bus = "00010000" then -- OUT_LED adress  CS_OUT_LED_n <= '0';  else  CS_OUT_LED_n <= '1';  end if;  else  CS_ROM_n <= '1';  CS_OUT_LED_n <= '1';  end if;  end process;    end rtl;

[Altera_Forum]

It looks like the problem is from outside of this entity. You are trying to drive its bus_en_n input from two places simultaneously.

[Altera_Forum]

simultaneously how...? is it in this code..

[Altera_Forum]

You tell us by showing the code that instantiates this entity. 

 You've connected two things to bus_en_n. bus_en_n is an input to this entity, so the problem is not in this code.