m3s029bo.vhd

来自「another 8051 core porocesssor vhdl sourc」· VHDL 代码 · 共 116 行

--*******************************************************************       --
--IMPORTANT NOTICE                                                          --
--================                                                          --
--Copyright Mentor Graphics Corporation 1996 - 1999.  All rights reserved.  --
--This file and associated deliverables are the trade secrets,              --
--confidential information and copyrighted works of Mentor Graphics         --
--Corporation and its licensors and are subject to your license agreement   --
--with Mentor Graphics Corporation.                                         --
--                                                                          --
--Use of these deliverables for the purpose of making silicon from an IC    --
--design is limited to the terms and conditions of your license agreement   --
--with Mentor Graphics If you have further questions please contact Mentor  --
--Graphics Customer Support.                                                --
--                                                                          --
--This Mentor Graphics core (m8051 v1999.120) was extracted on              --
--workstation hostid _hostid_ Inventra                                      --
--1 bit up counter(sync clear) for M8051
--Copyright Mentor Graphics Corporation and Licensors 1998.  All rights reserved
--v1.002
--*********************************************************************
--@(#)m3s029bo.vhd	1.2 04/08/99 SCCS Version Control

--File	        :       m3s029bo.vhd
--Created on    :       13th Dec 1995
--Purpose       :       1 bit up counter with synchronous clear for M8051
--Version       :       1.002
--Mod Date      :       2nd April 1998
--Mod History	:       1.002 _e suffix removed from entity names.
--
--
--
--
--*********************************************************************
--Hierarchy record      :
--Called by             :m3s028bo.vhd
--                      :
--                      :
--Calls to              :None
--*********************************************************************
library IEEE;

use IEEE.std_logic_1164.all;
library WORK;

--*********************************************************************
--Entity Definition
--*********************************************************************

entity m3s029bo is 
--*******************************************************************       --
--IMPORTANT NOTICE                                                          --
--================                                                          --
--Copyright Mentor Graphics Corporation 1996 - 1999.  All rights reserved.  --
--This file and associated deliverables are the trade secrets,              --
--confidential information and copyrighted works of Mentor Graphics         --
--Corporation and its licensors and are subject to your license agreement   --
--with Mentor Graphics Corporation.                                         --
--                                                                          --
--Use of these deliverables for the purpose of making silicon from an IC    --
--design is limited to the terms and conditions of your license agreement   --
--with Mentor Graphics If you have further questions please contact Mentor  --
--Graphics Customer Support.                                                --
--                                                                          --
--This Mentor Graphics core (m8051 v1999.120) was extracted on              --
--workstation hostid _hostid_ Inventra                                      --
       port(CO,
            Q:
            out std_logic;
            CI,
            CLEAR,
            COUNT_EN,
            NX1:
            in std_logic
            );
end m3s029bo;
--*********************************************************************
--Architecture definition
--*********************************************************************
architecture m3s029bo_rtl of m3s029bo is
--*********************************************************************
--*********************************************************************
--signal definition
--*********************************************************************
signal LQ,NEXTQ:std_logic;
--*********************************************************************
begin
--*********************************************************************
-- Process Definitions
--*********************************************************************
countr:process(NX1)
begin
    if NX1'event and NX1 ='1' then
        if CLEAR ='1' then
            LQ <= '0';
        elsif COUNT_EN = '1' then
            LQ <= NEXTQ;
        end if;
    end if;
end process countr;
--*********************************************************************
set_nextq:process(LQ,CI,CLEAR)
begin
   NEXTQ <= (LQ or CI) and (not (CI and  LQ)) and not CLEAR;
end process set_nextq;
--*********************************************************************
genout:process(LQ,CI,LQ)
begin
   Q <= LQ;
   CO <= CI and  LQ;
end process genout;
--*********************************************************************
end m3s029bo_rtl;
--*********************************************************************