mnemonics.vhd

来自「4位MCU AM2901的完整VHDL程序」· VHDL 代码 · 共 35 行

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-- Package mnemonics of micro-instruction
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library ieee;
use ieee.std_logic_1164.all;

package mnemonics is
--ALU source operand control mnemonics
  constant aq:std_logic_vector(2 downto 0):="000";
  constant ab:std_logic_vector(2 downto 0):="001";
  constant zq:std_logic_vector(2 downto 0):="010";
  constant zb:std_logic_vector(2 downto 0):="011";
  constant za:std_logic_vector(2 downto 0):="100";
  constant da:std_logic_vector(2 downto 0):="101";
  constant dq:std_logic_vector(2 downto 0):="110";
  constant dz:std_logic_vector(2 downto 0):="111";
--ALU function control mnemonics
  constant add:std_logic_vector(2 downto 0):="000";
  constant subr:std_logic_vector(2 downto 0):="001";
  constant subs:std_logic_vector(2 downto 0):="010";
  constant orrs:std_logic_vector(2 downto 0):="011";
  constant andrs:std_logic_vector(2 downto 0):="100";
  constant notrs:std_logic_vector(2 downto 0):="101";
  constant exor:std_logic_vector(2 downto 0):="110";
  constant exnor:std_logic_vector(2 downto 0):="111";
--ALU destination operand control mnemonics
  constant qreg:std_logic_vector(2 downto 0):="000";
  constant nop:std_logic_vector(2 downto 0):="001";
  constant rama:std_logic_vector(2 downto 0):="010";
  constant ramf:std_logic_vector(2 downto 0):="011";
  constant ramqd:std_logic_vector(2 downto 0):="100";
  constant ramd:std_logic_vector(2 downto 0):="101";
  constant ramqu:std_logic_vector(2 downto 0):="110";
  constant ramu:std_logic_vector(2 downto 0):="111";
end mnemonics;