Subversion Repositories tinycpu

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.NUMERIC_STD.ALL;

use ieee.std_logic_unsigned.all;

entity registerfile is

  port(

    Write:in std_logic_vector(7 downto 0); --what should be put into the write register

    SelRead:in std_logic_vector(2 downto 0); --select which register to read

    SelWrite:in std_logic_vector(2 downto 0); --select which register to write

    UseWrite:in std_logic; --if the register should actually be written to

    Clock:in std_logic;

    Read:out std_logic_vector(7 downto 0) --register to be read output

  );

end registerfile;

architecture Behavioral of registerfile is

  type registerstype is array(0 to 7) of std_logic_vector(7 downto 0);

  signal registers: registerstype;

begin

  writereg: process(Write, SelWrite, UseWrite, Clock)

  begin

    if(UseWrite='1') then

      if(rising_edge(clock)) then

        registers(conv_integer(SelWrite)) <= Write;

      end if;

    end if;

  end process;

  Read <= registers(conv_integer(SelRead));

end Behavioral;