-------------------------------------------------------------------------------
-- --
-- X X XXXXXX XXXXXX XXXXXX XXXXXX X --
-- XX XX X X X X X X X XX --
-- X X X X X X X X X X X X --
-- X X X X X X X X X X X X --
-- X X X X XXXXXX X X XXXXXX X --
-- X X X X X X X X X --
-- X X X X X X X X X --
-- X X X X X X X X X X --
-- X X XXXXXX XXXXXX XXXXXX XXXXXX X --
-- --
-- --
-- O R E G A N O S Y S T E M S --
-- --
-- Design & Consulting --
-- --
-------------------------------------------------------------------------------
-- --
-- Web: http://www.oregano.at/ --
-- --
-- Contact: 8051@oregano.at --
-- --
-------------------------------------------------------------------------------
-- --
-- MC8051 - VHDL 8051 Microcontroller IP Core --
-- Copyright (C) 2001 OREGANO SYSTEMS --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU Lesser General Public --
-- License as published by the Free Software Foundation; either --
-- version 2.1 of the License, or (at your option) any later version. --
-- --
-- This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- Lesser General Public License for more details. --
-- --
-- Full details of the license can be found in the file LGPL.TXT. --
-- --
-- You should have received a copy of the GNU Lesser General Public --
-- License along with this library; if not, write to the Free Software --
-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA --
-- --
-------------------------------------------------------------------------------
--
--
-- Author: Roland H鰈ler
--
-- Filename: alucore_.vhd
--
-- Date of Creation: Mon Aug 9 12:14:48 1999
--
-- Version: $Revision: 1.4 $
--
-- Date of Latest Version: $Date: 2002/01/07 12:17:44 $
--
--
-- Description: This unit performs simple logical operations.
--
--
--
--
-------------------------------------------------------------------------------
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
library work;
use work.mc8051_p.all;
-----------------------------ENTITY DECLARATION--------------------------------
entity alucore is
generic (DWIDTH : integer := 8); -- Data width of the ALU
port (op_a_i : in std_logic_vector(DWIDTH-1 downto 0);
op_b_i : in std_logic_vector(DWIDTH-1 downto 0);
alu_cmd_i : in std_logic_vector(3 downto 0);
cy_i : in std_logic_vector((DWIDTH-1)/4 downto 0);
cy_o : out std_logic_vector((DWIDTH-1)/4 downto 0);
result_o : out std_logic_vector(DWIDTH-1 downto 0));
end alucore;
-- op_a_i....... operand A
-- op_b_i....... operand B
-- alu_cmd_i.... command for the ALU core
-- cy_i......... carry flags (MSB is CY, rest is AC)
-- cy_o......... resulting carry out (MSB is CY, rest is AC)
-- result_o..... result
