Subversion Repositories tiny64

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

package TinyXconfig is

  constant XLEN : integer := 32;

  subtype  cpuWord is std_logic_vector(XLEN -1 downto 0);

  constant ccModeLeft    : integer := XLEN - 1;

  constant ccModeRight   : integer := XLEN - 4;

  constant aluModeLeft   : integer := XLEN - 5;

  constant aluModeRight  : integer := XLEN - 8;

  constant memmuxBit     : integer := XLEN - 9;

  constant dstClkLeft    : integer := XLEN - 10;

  constant dstClkRight   : integer := XLEN - 12;

  constant writeCycleBit : integer := XLEN - 13;

  constant opamuxLeft    : integer := XLEN - 14;

  constant opamuxRight   : integer := XLEN - 16;

  constant valmuxBit     : integer := XLEN - 17;

  constant opbmuxLeft    : integer := XLEN - 18;

  constant opbmuxRight   : integer := XLEN - 20;

  constant flagUpdateBit : integer := XLEN - 21;

  constant carryUseBit   : integer := XLEN - 22;

  -- two bits unused

  constant immediateLeft : integer := XLEN - 25;

  function getStdLogicVectorZeroes(int : in integer) return std_logic_vector;

end TinyXconfig;

package body TinyXconfig is

  function getStdLogicVectorZeroes(int : in integer) return std_logic_vector is

    variable result : std_logic_vector(int -1 downto 0);

  begin

    for index in result'range loop

      result(index) := '0';

    end loop;

    return result;

  end getStdLogicVectorZeroes;

end TinyXconfig;