mc8051_alu_.vhd
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- -- --
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- -- --
- -- --
- -- O R E G A N O S Y S T E M S --
- -- --
- -- Design & Consulting --
- -- --
- -------------------------------------------------------------------------------
- -- --
- -- Web: http://www.oregano.at/ --
- -- --
- -- Contact: mc8051@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: mc8051_alu_.vhd
- --
- -- Date of Creation: Mon Aug 9 12:14:48 1999
- --
- -- Version: $Revision: 1.7 $
- --
- -- Date of Latest Version: $Date: 2002/01/07 12:17:44 $
- --
- --
- -- Description: Connects the units alumux, alucore, addsub_core,
- -- comb_mltplr, comb_divider, and dcml_adjust together.
- -- The whole design is made up of combinational logic.
- --
- --
- --
- --
- -------------------------------------------------------------------------------
- library IEEE;
- use IEEE.std_logic_1164.all;
- use IEEE.std_logic_arith.all;
- library work;
- use work.mc8051_p.all;
-
- -----------------------------ENTITY DECLARATION--------------------------------
- entity mc8051_alu is
- generic (DWIDTH : integer := 8); -- Data width of the ALU
- port (rom_data_i : in std_logic_vector(DWIDTH-1 downto 0);
- ram_data_i : in std_logic_vector(DWIDTH-1 downto 0);
- acc_i : in std_logic_vector(DWIDTH-1 downto 0);
- cmd_i : in std_logic_vector(5 downto 0);
- cy_i : in std_logic_vector((DWIDTH-1)/4 downto 0);
- ov_i : in std_logic;
-
- new_cy_o : out std_logic_vector((DWIDTH-1)/4 downto 0);
- new_ov_o : out std_logic;
- result_a_o : out std_logic_vector(DWIDTH-1 downto 0);
- result_b_o : out std_logic_vector(DWIDTH-1 downto 0));
-
- end mc8051_alu;
- --Inputs:
- -- rom_data_i...... data input from ROM
- -- ram_data_i...... data input from RAM
- -- acc_i........... the contents of the accumulator register
- -- cmd_i........... command from the control unit
- -- cy_i............ CY-Flags of the SFR
- -- ov_i............ OV-Flag of the SFR
- --Outputs:
- -- new_cy_o........ new CY-Flags for SFR
- -- new_ov_o........ new OV-Flag for SFR
- -- result_a_o...... result
- -- result_b_o...... result