------------------------------------------------------------------------------- -- -- -- 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: 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: addsub_ovcy_.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: Adder/Subtractor with carry/borrow and arbitrary data -- width and overflow flag. -- -- -- -- ------------------------------------------------------------------------------- library IEEE; use IEEE.std_logic_1164.all; use IEEE.std_logic_arith.all; -----------------------------ENTITY DECLARATION-------------------------------- entity addsub_ovcy is generic (DWIDTH : integer := 4); port (opa_i : in std_logic_vector(DWIDTH-1 downto 0); -- Operand A opb_i : in std_logic_vector(DWIDTH-1 downto 0); -- Operand B addsub_i : in std_logic; -- Add or subtract command cy_i : in std_logic; -- Carry input cy_o : out std_logic; -- Carry/borrow bit ov_o : out std_logic; -- Overflow flag rslt_o : out std_logic_vector(DWIDTH-1 downto 0)); -- Result end addsub_ovcy;
